CN105446828B - A kind of DB Backup, restoration methods, apparatus and system - Google Patents
A kind of DB Backup, restoration methods, apparatus and system Download PDFInfo
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- CN105446828B CN105446828B CN201410523108.9A CN201410523108A CN105446828B CN 105446828 B CN105446828 B CN 105446828B CN 201410523108 A CN201410523108 A CN 201410523108A CN 105446828 B CN105446828 B CN 105446828B
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Abstract
The embodiment of the invention discloses a kind of DB Backup, restoration methods, apparatus and systems, when restoring to database to be restored, using the full backup data of full backup time database the last time to be restored and full backup time database the last time to be restored to the record data restored between object time point, data recovery is carried out to database to be restored.Using the embodiment of the present invention, it avoids in database recovery, the last database full-volume Backup Data before only using database recovery object time point restores database, the loss of data between the last database full-volume BACKUP TIME point before database recovery object time point to database recovery object time point.
Description
Technical field
The present invention relates to computer information safety technique field, in particular to a kind of DB Backup, restoration methods, device
And system.
Background technique
With the development of computer technology and Internet technology, the importance of information security becomes clear day by day.Database conduct
One important content of information security is also increasingly paid attention to.Database refer to be stored for a long time in computer it is organized, can be total to
The data acquisition system enjoyed.If do not backed up to database, database occur mistake when, cannot to database into
Row restore, so as to cause the loss of database data, at this time caused by lose and can not make up.
A kind of DB Backup commonly used in the prior art and restoration methods are to preset database full-volume BACKUP TIME
Point carries out full backup to database, generates database when the time reaching pre-set database full-volume BACKUP TIME point
Full backup data, so-called full backup, which refers to, completely backs up entire database.When database when something goes wrong,
Using the last database full-volume Backup Data before database recovery object time point, database is restored.
But database go wrong need to restore database when, using above-mentioned DB Backup and extensive
Compound method, the last database full-volume before the state of database can only being restored to database recovery object time point are standby
The state at part time point, full backup are taken time longer, and resource consumption is larger, therefore between the time of adjacent full backup twice
Every long, and when occurring database recovery demand during full backup, the last time complete database that can obtain
Full backup data after for a long time, often lead to database recovery object time point to database recovery object time point it
The mass data of preceding the last database full-volume BACKUP TIME point can not be restored, therefore the mode of full backup has more lack
It falls into and unsafe factor exists.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of DB Backup, restoration methods, apparatus and system, to prevent
The last data when database is restored, before database recovery object time point to database recovery object time point
The loss of data between library full backup time point.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of database backup methods, comprising:
It is standby in its full dose to each database respectively according to the full backup time point of each database in database group
Part time point carries out full backup；
Between the time of full backup twice adjacent to any database, the modification to the database is recorded, generates record
Data.
Preferably, the database group, comprising:
Under multi-tenant environment, a collection independently of database existing for other tenants of respectively every tenant configuration
It closes.
Preferably, the full backup time point of each database in the database group is pre-set；
Or the full backup time point, it is to be determined by policy management element.
Preferably, the policy management element determines the full backup time point, comprising:
The policy management element according to the full backup time interval of each database in preset database group, or
According to the database number in database the group perhaps storage size of each database or the modification frequency of database,
Determine the full backup time point of each database in database group.
Preferably, the policy management element determines the full backup time point, comprising:
The policy management element calculates each backup according to the BACKUP TIME interval of the database in the database group
The number of the database of time point quasi- starting full backup, if database number is greater than preset threshold value, by data inventory
The full backup time started at time point of the storage maximum database in space is moved forward or rearward to the second start time.
Preferably, the method also includes:
Incremental backup is carried out to the record data.
Preferably, described carry out incremental backup to the record data, comprising:
To the record data real-time perfoming incremental backup；
Or
At pre-set incremental backup time point, incremental backup is carried out to the record data.
Preferably, the method also includes:
Incremental backup data before current last time full backup is deleted.
Preferably, the incremental backup data by before current last time full backup is deleted, comprising:
After completing n-th full backup, by the incremental backup number between n-th full backup and (n-1)th full backup
According to deletion, wherein n=2,3,4 ....
In order to achieve the above objectives, the embodiment of the invention discloses a kind of database restoring methods, comprising:
Database recovery instruction is received, determines the recovery object time point T0 of database to be restored, the database recovery
It include the mark of database to be restored in instruction；
It is before obtaining the recovery object time point T0, full backup database the last time, T1 time to be restored complete
Measure Backup Data；
According to the full backup data and T0 to the record data between T1, it is extensive that data are carried out to database to be restored
It is multiple.
Preferably, it is described according to the full backup data and T0 to the record data between T1, to data to be restored
Library carries out data recovery, comprising:
It is using the full backup data of full backup database the last time, T1 time to be restored, database to be restored is extensive
T1 moment state is arrived again；
Using T0 to the record data between T1, by database recovery to be restored to T0 moment state.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of DB Backup devices, comprising: full backup mould
Block, record data generation module, wherein
The full backup module, for the full backup time point according to each database in database group, respectively
Full backup is carried out at its full backup time point to each database；
The record data generation module records between the time of full backup twice adjacent to any database to this
The modification of database generates record data.
Preferably, the database group, comprising:
Under multi-tenant environment, a collection independently of database existing for other tenants of respectively every tenant configuration
It closes.
Preferably, the full backup time point of each database in the database group is pre-set；
Or the full backup time point, it is to be determined by policy management element.
Preferably, the policy management element determines the full backup time point, comprising:
The policy management element according to the full backup time interval of each database in preset database group, or
According to the database number in database the group perhaps storage size of each database or the modification frequency of database,
Determine the full backup time point of each database in database group.
Preferably, the policy management element, determines the full backup time point, comprising:
The policy management element calculates each backup according to the BACKUP TIME interval of the database in the database group
The number of the database of time point quasi- starting full backup, if database number is greater than preset threshold value, by data inventory
The full backup time started at time point of the storage maximum database in space is moved forward or rearward to the second start time.
Preferably, described device further include: incremental backup module, wherein
The incremental backup module, for carrying out incremental backup to the record data.
Preferably, the incremental backup module, is specifically used for:
To the record data real-time perfoming incremental backup；
Or
At pre-set incremental backup time point, incremental backup is carried out to the record data.
Preferably, described device further include: removing module, wherein
The removing module, for deleting the incremental backup data before current last time full backup.
Preferably, the removing module, is specifically used for:
After completing n-th full backup, by the incremental backup number between n-th full backup and (n-1)th full backup
According to deletion, wherein n=2,3,4 ....
In order to achieve the above objectives, the embodiment of the invention discloses a kind of database recovery devices, comprising: determining module, complete
Amount backup obtains module and recovery module, wherein
The determining module, instruction is restored in library for receiving data, determines the recovery object time point of database to be restored
T0 includes the mark of database to be restored in database recovery instruction；
The full backup obtains module, for obtaining before the recovery object time point T0, database to be restored
The full backup data of the last full backup time T1；
The recovery module, for, to the record data between T1, being treated extensive according to the full backup data and T0
Complex data library carries out data recovery.
Preferably, the recovery module, is specifically used for:
It is using the full backup data of full backup database the last time, T1 time to be restored, database to be restored is extensive
T1 moment state is arrived again；
Using T0 to the record data between T1, by database recovery to be restored to T0 moment state.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of data base backup recovery systems, comprising: above-mentioned data
Any one of any one and above-mentioned database recovery device of library backup device.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of data base backup recovery systems, comprising: full backup
Module, record data generation module, determining module, full backup obtain module and recovery module,
The full backup module, for the full backup time point according to database, to database in each of which full dose
BACKUP TIME point carries out full backup；
The record data generation module, between the time of full backup twice adjacent to database, Huo Zhequan
Modification of the Cheng Jilu to the database generates record data；
The determining module, instruction is restored in library for receiving data, determines the recovery object time point of database to be restored；
The full backup obtains module, for obtaining before the recovery object time point, database to be restored most
The full backup data of nearly full backup time；
The recovery module, for obtaining the full backup data and restoring object time point to the recovery target
Record data between the time of database the last time full backup before time point, to be restored, according to the record data
Data recovery is carried out to database to be restored.
In order to achieve the above objectives, the embodiment of the invention discloses a kind of data base backup recovery systems, comprising: full backup
Module, record data generation module, determining module, full backup obtain module and recovery module,
The full backup module, for the full backup time point according to each database in database group, respectively
Full backup is carried out at its full backup time point to each database；
The record data generation module, for remembering between the time of full backup twice adjacent to any database
The modification to the database is recorded, record data are generated；
The determining module, instruction is restored in library for receiving data, determines the recovery object time point of database to be restored
T0 includes the mark of database to be restored in database recovery instruction；
The full backup obtains module, for obtaining before the recovery object time point T0, database to be restored
The full backup data of the last full backup time T1；
The recovery module, for, to the record data between T1, being treated extensive according to the full backup data and T0
Complex data library carries out data recovery.
As seen from the above technical solutions, the embodiment of the invention provides a kind of DB Backup, restoration methods, device and
System, according to the full backup time point of each database in database group, respectively to each database in its full backup
Time point carries out full backup；Between the time of full backup twice adjacent to any database, record repairs the database
Change, generates record data.Database when something goes wrong, database is used nearest before database recovery object time point
Database full-volume Backup Data and the secondary database full backup to database recovery object time point record data pair
Database is restored, and is avoided in database recovery, and the last time before database recovery object time point is only used
Database full-volume Backup Data restores database, database recovery object time point to database recovery object time point
The loss of data between the last database full-volume BACKUP TIME point before.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of flow diagram of database backup method provided in an embodiment of the present invention；
Fig. 2 is the flow diagram of another database backup method provided in an embodiment of the present invention；
Fig. 3 is the flow diagram of another database backup method provided in an embodiment of the present invention；
Fig. 4 is a kind of flow diagram of database restoring method provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of DB Backup device provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of another DB Backup device provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of another DB Backup device provided in an embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of database recovery device provided in an embodiment of the present invention.
Specific embodiment
The embodiment of the invention provides a kind of data base backup recovery system, which includes: full backup module, record
Data generation module, determining module, full backup obtain module and recovery module, wherein
Full backup module, for the full backup time point according to database, to database in each of which full backup
Time point carries out full backup；
Data generation module is recorded, between the time point of full backup twice adjacent to database, or it is whole
The modification to the database is recorded, record data are generated；
Determining module, instruction is restored in library for receiving data, determines the recovery object time point of database to be restored；
Full backup obtain module, for obtain it is described recovery object time point before, database nearest one to be restored
The full backup data of secondary full backup time；
Recovery module, for obtaining the full backup data and restoring object time point to the recovery object time
Record data before point, between the time of database the last time full backup to be restored, are treated according to the record data
Restore database and carries out data recovery.
The embodiment of the invention provides a kind of data base backup recovery system, which includes: full backup module, record
Data generation module, determining module, full backup obtain module and recovery module, wherein
Full backup module, for the full backup time point according to each database in database group, respectively to every
A database carries out full backup at its full backup time point；
Data generation module is recorded, between the time of full backup twice adjacent to any database, record pair
The modification of the database generates record data；
Determining module, instruction is restored in library for receiving data, determines the recovery object time point T0 of database to be restored, institute
State the mark including database to be restored in database recovery instruction；
Full backup obtains module, for before obtaining the recovery object time point T0, database to be restored to be nearest
The full backup data of full backup time T1；
Recovery module, for according to the full backup data and T0 to the record data between T1, to number to be restored
Data recovery is carried out according to library.
The embodiment of the invention provides a kind of DB Backup, restoration methods, apparatus and systems, wherein
Database backup method includes: the full backup time point according to database, standby in each of which full dose to database
Part time point carries out full backup；Between the time point of full backup twice adjacent to database, or whole record is to this
The modification of database generates record data.
Database restoring method includes: to receive database recovery instruction, determines the recovery object time of database to be restored
Point；Obtain before the recovery object time point, the full backup number of full backup time database the last time to be restored
According to；Obtain the full backup data and restore object time point to it is described recovery object time point before, number to be restored
According to the record data between the time of library the last time full backup, data are carried out to database to be restored according to the record data
Restore.
The embodiment of the invention provides a kind of DB Backup, restoration methods, apparatus and systems, wherein
Database backup method include: according to the full backup time point of each database in database group, it is right respectively
Each database carries out full backup at its full backup time point；In the time to the adjacent full backup twice of any database
Between, the modification to the database is recorded, record data are generated.
Database restoring method includes: to receive database recovery instruction, determines the recovery object time of database to be restored
Point T0 includes the mark of database to be restored in the database recovery instruction；Before obtaining the recovery object time point T0
, the full backup data of full backup database the last time, T1 time to be restored；According to the full backup data and
T0 carries out data recovery to database to be restored to the record data between T1.
Wherein, full backup refers to completely is backed up to some database in database group.Recording data can
To be transaction journal.In practical applications, to the modification of database, the transaction journal of database, institute can be used by carrying out record
The transaction journal of meaning is the file that one and database file separate, it is the file of the update status for database of record,
It can recorde any operation for database, and the result of record is saved in independent file.
Database when something goes wrong, the last data before database recovery object time point are used to database
Library full backup data and the secondary database full backup to database recovery object time point record data to database into
Row restores, and avoids in database recovery, the last database before only using database recovery object time point is complete
Amount Backup Data restores database, before database recovery object time point to database recovery object time point most
The loss of data between nearly database full-volume BACKUP TIME point.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Below by specific embodiment, the present invention is described in detail.
Fig. 1 is a kind of flow diagram of database backup method provided in an embodiment of the present invention, may include:
S101: according to the full backup time point of each database in database group, respectively to each database at it
Full backup time point carries out full backup；
Wherein, the full backup time point of each database in database group can be pre-set.
Specifically, database group is in the environment of multi-tenant, and one of respectively every tenant configuration is independently of other
The set of database existing for tenant；
Illustratively, in embodiments of the present invention, it is assumed that database group includes: the number of entitled Management System of Plot Estate
According to library, the human resource management database of the database of entitled X supermarket commodity and entitled Y company.
It is illustrated by taking the entitled Management System of Plot Estate of database as an example below,
Assuming that Management System of Plot Estate database pre-set full backup time point are as follows: daily 0:00,6:
00,12:00 and 18:00, i.e., full backup database Management System of Plot Estate, each full backup interval 6 are small 4 times a day
When.
There are 7 tables in the Management System of Plot Estate database, be respectively as follows: table 1A, table 1B, table 1C, table 1D, table 1E,
Table 1F and table 1G.
Wherein, infrastructure management company's ID number, title, address, telephone number are recorded in table 1A and are set up the time；
Owner's ID number, name are recorded in table 1B, move in time, room number, building number and cell ID number；
Infrastructure management company employee ID number is recorded in table 1C, name, responsible project, is responsible for cell ID number, home address and connection
It is phone；
Recording cell ID number, cell name, responsible person, creation data and subdistrict position in table 1D；
ID users, name, password, user name and permission are recorded in table 1E；
Building number, cell ID number, the number of plies and the built time are recorded in table 1F；
Room number is recorded in table 1G, Lou Hao, cell ID number, whether is moved in and User ID.
Assuming that the state of certain day 6:00 Management System of Plot Estate database is as follows:
Table 1A
| Cid | Cname | Cads | Cnum | Ctime |
| 1 | Safety property | Beijing southern exposure | 85510000 | 2003-10-3 |
| 2 | For your property | Beijing Haidian | 88520101 | 2005-12-5 |
Table 1B
| Yid | Yname | Ytime | Room | Louyu | Xid |
| 1 | Zhang San | 2006-10-3 | 101 | 1 | 1 |
| 2 | Li Si | 2006-5-6 | 201 | 2 | 2 |
Table 1C
| Wid | Wname | Xiangmu | Xid | Wads | Wnum |
| 1 | King five | Maintenance | 1 | Hebei Handan | 15910101223 |
| 2 | Zhao six | Security | 2 | Shandong Zibo | 13652365986 |
Table 1D
| Xid | Xname | Wname | Xdate | Weizhi |
| 1 | Mingguang City's cell | Qian great | 2003-8-8 | Beijing southern exposure |
| 2 | Build cell | Sun great | 2004-5-7 | Beijing Haidian |
Table 1E
| Tid | Tname | Tpas | Tnum | Quanxian |
| 1 | Admin | Admin | Admin | Admin |
| 2 | User | User | User | Guest |
Table 1F
| Louyu | Xid | Lnum | Date |
| 1 | 1 | 3 | 2005-5-4 |
| 2 | 1 | 3 | 2005-5-6 |
| 1 | 2 | 3 | 2004-6-5 |
| 2 | 2 | 3 | 2005-8-4 |
Table 1G
| Room | Louyu | Xid | YN | Tid |
| 101 | 1 | 1 | Y | 1 |
| 201 | 1 | 1 | N |
| 301 | 1 | 1 | N | |
| 101 | 2 | 1 | N | |
| 201 | 2 | 1 | N | |
| 301 | 2 | 1 | N | |
| 101 | 1 | 2 | N | |
| 201 | 1 | 2 | N | |
| 301 | 1 | 2 | N | |
| 101 | 2 | 2 | N | |
| 201 | 2 | 2 | Y | 2 |
| 301 | 2 | 2 | N |
Management System of Plot Estate database under the state is subjected to a full backup, generates the 6:00 residential property
The full backup data in Management System Data library.
The full backup time point of each database in database group is also possible to: by presetting a tactical management
What unit determined.
Specifically, presetting a policy management element, policy management element is according to each in preset database group
The full backup time interval of a database, or the storage according to database number or each database in database group
The modification frequency of space size or database determines the full backup time point of each database in database group.Strategy
Administrative unit can also calculate each BACKUP TIME point and intend opening according to the BACKUP TIME interval of the database in the database group
The number of the database of dynamic full backup, if database number is greater than preset threshold value, by storage space of database maximum
Full backup time started at time point of database be moved forward or rearward to the second start time.
Specifically, under multi-tenant environment, for one of every tenant configuration independently of database existing for other tenants.
When being backed up at least one or multiple databases, the full backup time interval of different databases is opened as far as possible
Come, rather than is being backed up simultaneously at the same time.
Specifically, we can be set as every a fixed period from the time of creation database to the number
Full backup is carried out according to library.Since under multi-tenant environment, it is unfixed that the time of database is created for each tenant, thus it is each
It at the full backup time point of a database, is typically spaced apart.But also it will appear, the data of some time point full backup
The case where pressure is excessively brought to backup server in library appearance, therefore a policy management element is set, it is entire backup services
The full backup time point of the database cluster of device is managed, so that the BACKUP TIME point of each tenant is different, full backup
Time point is able to equilibrium assignment.
Specifically, policy management element determines the full backup time point of each database are as follows: according to preset each number
According to the full backup time interval in library, according to the number of database, the modification frequency of database, the size of storage space of database
Etc. factors determine.
Specifically, the full backup time interval of each database, be can have user or this system carry out it is artificial or
Automatic calculating and setting.
Specifically, policy management element has according to each BACKUP TIME point of BACKUP TIME interval calculation of all databases
How many a databases will start full backup, if database number is greater than preset threshold value, by storage space of database
The full backup time started at time point of maximum database is moved forward or rearward to the second start time.For example, multi-tenant
Under environment, creation has 3 databases altogether, and the full backup time interval of database 1 is 3 hours, and memory space is 5G；Data
The full backup time interval in library 2 is 2 hours, and memory space is 6G；The full backup time interval of database 3 is 1 hour, is deposited
Storing up space is 7G.Assuming that the first time starting point of 3 databases is intended carrying out full dose when being separately positioned on, 3 o'clock at 1 point at 2 points
Backup, policy management element are calculated, and will have 3 databases to start simultaneously at full backup when 4 o'clock, if in advance
If threshold value be 2,3 to be greater than preset threshold value 2, then policy management element is by the of the maximum data library 3 that memory space is 7G
One start time postpones half an hour backward.
S102: between the time of full backup twice adjacent to any database, the modification to the database is recorded, is generated
Record data.
Illustratively, the modification carried out to above-mentioned Management System of Plot Estate database, can be using based on before and after data
The mode of variation is recorded, as shown in table 2:
Table 2
| Time | Table name | Column name | Line number | Before variation | After variation |
| 8:10 | Table 1B | Room | 1 | 101 | 301 |
| 8:10 | Table 1G | YN | 1 | Y | N |
| 8:10 | Table 1G | Tid | 1 | 1 | |
| 8:10 | Table 1G | YN | 3 | N | Y |
| 8:10 | Table 1G | Tid | 3 | 1 | |
| 9:20 | Table 1A | Cid | 3 | 3 | |
| 9:20 | Table 1A | Cname | 3 | Permanent sincere property | |
| 9:20 | Table 1A | Cads | 3 | Beijing southern exposure | |
| 9:20 | Table 1A | Cnum | 3 | 85514520 | |
| 9:20 | Table 1A | Ctime | 3 | 2004-5-6 | |
| 12:25 | Table 1C | Wid | 1 | 1 | |
| 12:25 | Table 1C | Wname | 1 | King five | |
| 12:25 | Table 1C | Xiangmu | 1 | Maintenance | |
| 12:25 | Table 1C | Xid | 1 | 1 | |
| 12:25 | Table 1C | Wads | 1 | Hebei Handan | |
| 12:25 | Table 1C | Wnum | 1 | 15910101223 |
To the modification that Management System of Plot Estate database carries out, can also be recorded by the way of based on sentence,
8:10, update ' table 1B ' set Room=' 301 ' where Yname=' Zhang San '；
101 ' AND Louyu=' 1 ' of update ' table 1G ' set YN=' N ' and Tid=" where Room='；
1 ' where Room=' of update ' table 1G ' set YN=' Y ' and Tid=', 301 ' AND Louyu=' 1 '；
The permanent sincere property of 9:20, insert into ' table 1A ' values (' 3 ', ' ', ' Beijing southern exposure ', ' 85514520 ', '
2004-5-6')；
12:25, delete from ' table 1C ' where Wname=' king five '；
In practical applications, to the modification of database, the transaction journal of database, so-called thing can be used by carrying out record
Business log is file that one and database file separate, it is the file of the update status for database of record, it can be with
Any operation of the recording needle to database, and the result of record is saved in independent file.
It should be noted that the mode recorded limits not to the modification of database in the application, any possibility
Implementation can be applied to the application in.
It should be noted that above-mentioned be illustrated by taking the entitled Management System of Plot Estate of database as an example, only one
Specific example, and the restriction of not pairs of enough the application.
Divided using embodiment illustrated in fig. 1 of the present invention according to the full backup time point of each database in database group
It is other that full backup is carried out at its full backup time point to each database；In full backup twice adjacent to any database
Between between, record modification to the database, generate record data.Database when something goes wrong, to database use data
Restore the last database full-volume Backup Data and the secondary database full backup to database before object time point in library
The record data for restoring object time point restore database, avoid in database recovery, it is extensive to only use database
The last database full-volume Backup Data before complicated target time point restores database, when database recovery target
Between point to data between the last database full-volume BACKUP TIME point before database recovery object time point loss.
Fig. 2 is the flow diagram of another database backup method provided in an embodiment of the present invention, shown in Fig. 2 of the present invention
On the basis of embodiment embodiment shown in Fig. 1, increase S103: incremental backup is carried out to the record data.
Wherein, incremental backup refers to the data for only backing up modified after last backup every time, can be to the record number
According to real-time perfoming incremental backup.
In view of in practical applications, to record data real-time perfoming incremental backup, occupying system resources are to save
The occupancy for resource of uniting, can preset incremental backup time point, to record data at pre-set incremental backup time point
Carry out incremental backup.
Assuming that pre-set incremental backup time point are as follows: daily 2:00,4:00,8:00,9:00,10:00,14:00,
16:00,20:00 and 22:00,
The modification that then above-mentioned Management System of Plot Estate database is carried out, the incremental backup difference that record data carry out
Are as follows:
First time incremental backup is carried out in 8:00, the modification to Management System of Plot Estate database 6:00-8:00 generates
Record data carry out incremental backup,
Second of incremental backup is carried out in 9:00, the modification to Management System of Plot Estate database 8:00-9:00 generates
Record data carry out incremental backup,
Third time incremental backup is carried out in 10:00, the modification to Management System of Plot Estate database 9:00-10:00 is raw
At record data carry out incremental backup,
The 4th incremental backup is carried out in 14:00, the modification to Management System of Plot Estate database 12:00-14:00,
The record data of generation carry out incremental backup.
It should be noted that above-mentioned be illustrated by taking the entitled Management System of Plot Estate of database as an example, only one
Specific example, and the restriction of not pairs of enough the application.
Using embodiment illustrated in fig. 2 of the present invention, database when something goes wrong, database recovery target is used to database
When the last database full-volume Backup Data before time point and secondary database full backup to the database recovery target
Between the record data put database is restored, avoid in database recovery, only use the database recovery object time
The last database full-volume Backup Data before point restores database, database recovery object time point to data
The loss of data between the last database full-volume BACKUP TIME point before library recovery object time point.And to generation
Record data are backed up, it is therefore prevented that due to the generation for the case where recording the loss of data, causing database that cannot repair.
In view of in practical applications, the number for carrying out incremental backup is more, the incremental backup data of generation more occupies magnetic
Disk space, in order to reduce the occupancy of disk space, the embodiment of the present invention also provides another database backup method, referring to Fig. 3
It is shown, on the basis of embodiment illustrated in fig. 3 embodiment shown in Fig. 2 of the present invention, increase S104: will current last time full backup
Incremental backup data before is deleted.
Specifically, confirming the secondary full backup success and this time in database administrator after completing a full backup
In the case that the database at full backup time point is errorless, incremental backup data before the secondary full backup time point can be by
It deletes.It in practical applications, can be after completing n-th full backup, by n-th full backup and (n-1)th full backup
Between incremental backup data and/or differential backup data delete, wherein n=2,3,4 ....
Using embodiment illustrated in fig. 3 of the present invention, reduce since multiple incremental backs up, so that the incremental backup data generated
To the occupancy of disk space.
Fig. 4 is a kind of flow diagram of database restoring method provided in an embodiment of the present invention, may include:
S201: database recovery instruction is received, determines the recovery object time point T0 of database to be restored；
It wherein, include the mark of database to be restored in database recovery instruction, the mark can be number in practical applications
According to the title in library.
Illustratively, it is illustrated by taking the entitled Management System of Plot Estate of database as an example below.
In embodiments of the present invention, it is generally the case that can be by database recovery to current time, i.e. recovery object time point
T0 refers to current time, such as when encountering power failure, computer down machine, needs to be restored to the database of current time.
In some cases, it is also desirable to by sometime, the application is also suitable before database recovery to current time
In specified the case where restoring object time point T0.Such as: current time 13:00, database administrator is to Property Management of residence
System carries out data inspection and finds that mistake occurs for its data, the analysis found that, occur from the data of the 10:20 points of databases wrong
Accidentally, it is therefore desirable to which the data of the database are restored to 10:20.
Further for example, Database Systems find that error in data occurs in some full backup data when carrying out self-test, then counting
When preparing to repair this mistake according to library recovery system, it will be determined according to the BACKUP TIME of database to be restored and restore the object time
Point T0.
Further for example, user oneself after database read-write operation to going back on one's word, it is desirable to by database recovery to mistake desired by oneself
When going the state at some time point, when present in database recovery system obtains the recovery target for the database to be restored that a user informs
Between point T0.
S202: before the acquisition recovery object time point T0, full backup time database the last time to be restored
The full backup data of T1；
The last data according to the database recovery time point 10:20 that S201 is determined, before first looking for 10:20
Library full backup is the full backup that 6:00 is carried out.
S203: according to the full backup data and T0 to the record data between T1, database to be restored is carried out
Data are restored.
Wherein, documented information in data is recorded, is the full backup database deadline T1 of the last time,
To the data modified to database received between the data recovery instruction time.
Specifically, using the full backup data of full backup database the last time, T1 time to be restored, it will be to be restored
Database recovery is to T1 moment state；
Using T0 to the record data between T1, by database recovery to be restored to T0 moment state.
Firstly, using the full backup data of 6:00 by the state of Management System of Plot Estate database recovery to 6:00 such as
Under:
Table 1A
| Cid | Cname | Cads | Cnum | Ctime |
| 1 | Safety property | Beijing southern exposure | 85510000 | 2003-10-3 |
| 2 | For your property | Beijing Haidian | 88520101 | 2005-12-5 |
Table 1B
| Yid | Yname | Ytime | Room | Louyu | Xid |
| 1 | Zhang San | 2006-10-3 | 101 | 1 | 1 |
| 2 | Li Si | 2006-5-6 | 201 | 2 | 2 |
Table 1C
| Wid | Wname | Xiangmu | Xid | Wads | Wnum |
| 1 | King five | Maintenance | 1 | Hebei Handan | 15910101223 |
| 2 | Zhao six | Security | 2 | Shandong Zibo | 13652365986 |
Table 1D
| Xid | Xname | Wname | Xdate | Weizhi |
| 1 | Mingguang City's cell | Qian great | 2003-8-8 | Beijing southern exposure |
| 2 | Build cell | Sun great | 2004-5-7 | Beijing Haidian |
Table 1E
| Tid | Tname | Tpas | Tnum | Quanxian |
| 1 | Admin | Admin | Admin | Admin |
| 2 | User | User | User | Guest |
Table 1F
| Louyu | Xid | Lnum | Date |
| 1 | 1 | 3 | 2005-5-4 |
| 2 | 1 | 3 | 2005-5-6 |
| 1 | 2 | 3 | 2004-6-5 |
| 2 | 2 | 3 | 2005-8-4 |
Table 1G
| Room | Louyu | Xid | YN | Tid |
| 101 | 1 | 1 | Y | 1 |
| 201 | 1 | 1 | N | |
| 301 | 1 | 1 | N | |
| 101 | 2 | 1 | N | |
| 201 | 2 | 1 | N | |
| 301 | 2 | 1 | N |
| 101 | 1 | 2 | N | |
| 201 | 1 | 2 | N | |
| 301 | 1 | 2 | N | |
| 101 | 2 | 2 | N | |
| 201 | 2 | 2 | Y | 2 |
| 301 | 2 | 2 | N |
Recycle 6:00 to the record data between 10:20, it may be assumed that 8:10 record to Management System of Plot Estate database
Data, the data to Management System of Plot Estate database update of 9:20 record of modification.
Data recovery is carried out to Management System of Plot Estate database.
The state of Management System of Plot Estate database recovery to 9:20 is as follows:
Table 1A
| Cid | Cname | Cads | Cnum | Ctime |
| 1 | Safety property | Beijing southern exposure | 85510000 | 2003-10-3 |
| 2 | For your property | Beijing Haidian | 88520101 | 2005-12-5 |
| 3 | Permanent sincere property | Beijing southern exposure | 85514520 | 2004-5-6 |
Table 1B
| Yid | Yname | Ytime | Room | Louyu | Xid |
| 1 | Zhang San | 2006-10-3 | 301 | 1 | 1 |
| 2 | Li Si | 2006-5-6 | 201 | 2 | 2 |
Table 1C
| Wid | Wname | Xiangmu | Xid | Wads | Wnum |
| 1 | King five | Maintenance | 1 | Hebei Handan | 15910101223 |
| 2 | Zhao six | Security | 2 | Shandong Zibo | 13652365986 |
Table 1D
| Xid | Xname | Wname | Xdate | Weizhi |
| 1 | Mingguang City's cell | Qian great | 2003-8-8 | Beijing southern exposure |
| 2 | Build cell | Sun great | 2004-5-7 | Beijing Haidian |
Table 1E
| Tid | Tname | Tpas | Tnum | Quanxian |
| 1 | Admin | Admin | Admin | Admin |
| 2 | User | User | User | Guest |
Table 1F
| Louyu | Xid | Lnum | Date |
| 1 | 1 | 3 | 2005-5-4 |
| 2 | 1 | 3 | 2005-5-6 |
| 1 | 2 | 3 | 2004-6-5 |
| 2 | 2 | 3 | 2005-8-4 |
Table 1G
| Room | Louyu | Xid | YN | Tid |
| 101 | 1 | 1 | N | |
| 201 | 1 | 1 | N | |
| 301 | 1 | 1 | Y | 1 |
| 101 | 2 | 1 | N | |
| 201 | 2 | 1 | N |
| 301 | 2 | 1 | N | |
| 101 | 1 | 2 | N | |
| 201 | 1 | 2 | N | |
| 301 | 1 | 2 | N | |
| 101 | 2 | 2 | N | |
| 201 | 2 | 2 | Y | 2 |
| 301 | 2 | 2 | N |
Due to not modifying to Management System of Plot Estate database in 9:20 to 10:20, therefore 10:20 cell
The state of Property Management System database is identical with the state of 9:20 Management System of Plot Estate database.So far, residential property
The data in Management System Data library are restored to complete.
By database recovery to current time, ideally, when T3 immediate with current time T2
Between database data can be identical as the database data of current time T2, it is likely that transaction log backup not in time, is led
The database for being finally restored to the T3 time is caused, it is variant with the database of T2 time earlier than the database data of T2 time.
Citing 1:
Assuming that there is first full backup to be completed in the T0 time, second full backup time starts from the T1 time, will be in
The T4 time terminates, and when second full backup database not yet backs up completion, user is extensive by database in T2 time requirement
The T2 time is arrived again, however the transaction journal of T2 time has a not yet record to enter, to meet the needs of users, skill of the invention
The database that art scheme may be implemented to be restored to the T3 time earlier than the T2 time is to user.The database that the T2 time receives user is extensive
After multiple request, the full backup database of the last time, the i.e. database of T0 time are searched, searches the last record
Transaction journal finds the transaction journal of no T2 time, and the last is the transaction journal at T3 time point.It is arrived according to the T0 time
The database of T0 time is gradually restored to the T3 time by the data operation information of database documented by the transaction journal of T3 time
The database of point, i.e. reduction obtain and T2 time immediate T3 temporal database.In citing 1, time T0 < T1 < T3 < T2 < T4.
Citing 2:
Assuming that there is first full backup to be completed in the T0 time, second full backup time starts from the T1 time, and in
The T4 time terminates, and when T2 time after the T4 time not yet starts third time full backup, and user is in T2 time requirement by data
Library is restored to the T2 time, however the transaction journal of T2 time has a not yet record to enter, and the last transaction journal is T3
The transaction journal of time, to meet the needs of users, technical solution of the present invention may be implemented to be restored to the T3 earlier than the T2 time
The database of time is to user.After the T2 time receives the database recovery request of user, the full dose for searching the last time is standby
Part database, the i.e. database of T4 time search the transaction journal of the last record, find the affairs day of no T2 time
Will, the last is the transaction journal at T3 time point.According to database documented by transaction journal of the T4 time to the T3 time
Data operation information, the database of T4 time is gradually restored to the database at T3 time point, i.e., reduction obtain with the T2 time
Immediate T3 temporal database.In citing 2, time T0 < T1 < T4 < T3 < T2.
It should be noted that above-mentioned be illustrated by taking the entitled Management System of Plot Estate of database as an example, only one
Specific example, and the restriction of not pairs of enough the application.
Using embodiment illustrated in fig. 4 of the present invention, database when something goes wrong, database recovery target is used to database
When the last database full-volume Backup Data before time point and secondary database full backup to the database recovery target
Between the record data put database is restored, avoid in database recovery, only use the database recovery object time
The last database full-volume Backup Data before point restores database, database recovery object time point to data
The loss of data between the last database full-volume BACKUP TIME point before library recovery object time point.
Corresponding with above-mentioned embodiment of the method, the embodiment of the present invention also provides data backup device and data restore dress
It sets.
Fig. 5 is a kind of structural schematic diagram of DB Backup device provided in an embodiment of the present invention, may include: that full dose is standby
Part module 301 and record data generation module 302,
Wherein, full backup module 301, for the full backup time point according to each database in database group,
Full backup is carried out at its full backup time point to each database respectively；Wherein,
Database group are as follows: under multi-tenant environment, one of respectively every tenant configuration exists independently of other tenants
Database set.
It at the full backup time point of each database in database group, can be pre-set, be also possible to pass through
What a pre-set policy management element determined, policy management element can be according to each number in preset database group
It is big according to the full backup time interval in library, or according to the memory space of database number and each database in database group
Small determination.
Specifically, policy management element, when can be according to the full backup of each database in preset database group
Between be spaced, or according to the database number in database the group perhaps storage size of each database or database
Frequency is modified, determines the full backup time point of each database in database group.
Specifically, policy management element can also be counted according to the BACKUP TIME interval of the database in the database group
The number for calculating the database of the quasi- starting full backup of each BACKUP TIME point, if database number is greater than preset threshold value,
The full backup time started at time point of the maximum database of storage space of database was moved forward or rearward to the second time
Starting point.
Data generation module 302 is recorded, is used between the time of full backup twice adjacent to any database, record pair
The modification of the database generates record data.
Using embodiment illustrated in fig. 5 of the present invention, at the full backup time point according to each database in database group,
Full backup is carried out at its full backup time point to each database respectively；To the adjacent full backup twice of any database
Between, the modification to the database is recorded, record data are generated.Database when something goes wrong, to database use database
The last database full-volume Backup Data and the secondary database full backup before restoring object time point is extensive to database
The record data at complicated target time point restore database, avoid in database recovery, only use database recovery
The last database full-volume Backup Data before object time point restores database, the database recovery object time
It puts to the loss of data between the last database full-volume BACKUP TIME point before database recovery object time point.
Fig. 6 is the structural schematic diagram of another DB Backup device provided in an embodiment of the present invention, shown in Fig. 6 of the present invention
On the basis of embodiment embodiment shown in Fig. 5, increase incremental backup module 303, wherein
Incremental backup module 303, for carrying out incremental backup to the record data.
The incremental backup module 303 of the embodiment of the present invention, specifically can be used for:
To the record data real-time perfoming incremental backup；
Or
At pre-set incremental backup time point, incremental backup is carried out to the record data.
Using embodiment illustrated in fig. 6 of the present invention, database when something goes wrong, database recovery target is used to database
When the last database full-volume Backup Data before time point and secondary database full backup to the database recovery target
Between the record data put database is restored, avoid in database recovery, only use the database recovery object time
The last database full-volume Backup Data before point restores database, database recovery object time point to data
The loss of data between the last database full-volume BACKUP TIME point before library recovery object time point.And to generation
Record data are backed up, it is therefore prevented that due to the generation for the case where recording the loss of data, causing database that cannot repair.
Fig. 7 is the structural schematic diagram of another DB Backup device provided in an embodiment of the present invention, shown in Fig. 7 of the present invention
On the basis of embodiment embodiment shown in Fig. 6, increase removing module 304, wherein
Removing module 304, for deleting the incremental backup data before current last time full backup.
The removing module 304 of the embodiment of the present invention, specifically can be used for:
After completing n-th full backup, by the incremental backup number between n-th full backup and (n-1)th full backup
According to deletion, wherein n=2,3,4 ....
Using embodiment illustrated in fig. 7 of the present invention, reduce since multiple incremental backs up, so that the incremental backup data generated
To the occupancy of disk space.
Fig. 8 is a kind of structural schematic diagram of database recovery device provided in an embodiment of the present invention, may include: determining mould
Block 401, full backup obtain module 402 and recovery module 403, wherein
Determining module 401, instruction is restored in library for receiving data, determines the recovery object time point of database to be restored
T0 includes the mark of database to be restored in database recovery instruction；
Full backup obtain module 402, for obtain it is described recovery object time point T0 before, database to be restored most
The full backup data of nearly full backup time T1；
Recovery module 403, for according to the full backup data and T0 to the record data between T1, to be restored
Database carries out data recovery.
The recovery module 403 of the embodiment of the present invention, specifically can be used for:
It is using the full backup data of full backup database the last time, T1 time to be restored, database to be restored is extensive
T1 moment state is arrived again；
Using T0 to the record data between T1, by database recovery to be restored to T0 moment state.
Using embodiment illustrated in fig. 8 of the present invention, database when something goes wrong, database recovery target is used to database
When the last database full-volume Backup Data before time point and secondary database full backup to the database recovery target
Between the record data put database is restored, avoid in database recovery, only use the database recovery object time
The last database full-volume Backup Data before point restores database, database recovery object time point to data
The loss of data between the last database full-volume BACKUP TIME point before library recovery object time point.
The embodiment of the present invention also provides a kind of data base backup recovery system, including any of above-mentioned DB Backup device
Any one of a kind of and above-mentioned database recovery device.
The embodiment of the present invention also provides a kind of data base backup recovery system, comprising: full backup module, record data are raw
Module and recovery module are obtained at module, determining module, full backup, wherein
The full backup module, for the full backup time point according to database, to database in each of which full dose
BACKUP TIME point carries out full backup；
The record data generation module, between the time of full backup twice adjacent to database, Huo Zhequan
Modification of the Cheng Jilu to the database generates record data；
The determining module, instruction is restored in library for receiving data, determines the recovery object time point of database to be restored；
The full backup obtains module, for obtaining before the recovery object time point, database to be restored most
The full backup data of nearly full backup time；
The recovery module, for obtaining the full backup data and restoring object time point to the recovery target
Record data between the time of database the last time full backup before time point, to be restored, according to the record data
Data recovery is carried out to database to be restored.
The embodiment of the present invention also provides a kind of data base backup recovery system, comprising: full backup module, record data are raw
Module and recovery module are obtained at module, determining module, full backup, wherein
The full backup module, for the full backup time point according to each database in database group, respectively
Full backup is carried out at its full backup time point to each database；
The record data generation module, for remembering between the time of full backup twice adjacent to any database
The modification to the database is recorded, record data are generated；
The determining module, instruction is restored in library for receiving data, determines the recovery object time point of database to be restored
T0 includes the mark of database to be restored in database recovery instruction；
The full backup obtains module, for obtaining before the recovery object time point T0, database to be restored
The full backup data of the last full backup time T1；
The recovery module, for, to the record data between T1, being treated extensive according to the full backup data and T0
Complex data library carries out data recovery.
Using data base backup recovery system provided in an embodiment of the present invention, avoids in database recovery, only use
The last database full-volume Backup Data before database recovery object time point restores database, and database is extensive
Data between the last database full-volume BACKUP TIME point before complicated target time point to database recovery object time point
Loss.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device reality
For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method
Part explanation.
Those of ordinary skill in the art will appreciate that all or part of the steps in realization above method embodiment is can
It is completed with instructing relevant hardware by program, the program can store in computer-readable storage medium,
The storage medium designated herein obtained, such as: ROM/RAM, magnetic disk, CD.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (19)
1. a kind of database backup method, which is characterized in that the described method includes:
According to the full backup time point of each database in database group, respectively to each database in its full backup
Between point carry out full backup；
Between the time of full backup twice adjacent to any database, the modification to the database is recorded, generates record data；
Incremental backup is carried out to the record data, the incremental backup refers to the number for only backing up modified after last backup every time
According to；
Wherein, the full backup time point, is determined by policy management element；
The policy management element determines the full backup time point, comprising:
The policy management element calculates each BACKUP TIME according to the BACKUP TIME interval of the database in the database group
The number of the database of the quasi- starting full backup of point, if database number is greater than preset threshold value, by database purchase sky
Between full backup time started at time point of maximum database be moved forward or rearward to the second start time.
2. the method according to claim 1, wherein the database group, comprising:
Under multi-tenant environment, a set independently of database existing for other tenants of respectively every tenant configuration.
3. the method according to claim 1, wherein the policy management element determines the full backup time
Point, comprising:
The policy management element according to the full backup time interval of each database in preset database group, or according to
Database number in database the group perhaps storage size of each database or the modification frequency of database, determine
The full backup time point of each database in database group.
4. the method according to claim 1, wherein described carry out incremental backup to the record data, comprising:
To the record data real-time perfoming incremental backup；Or
At pre-set incremental backup time point, incremental backup is carried out to the record data.
5. the method according to claim 1, wherein the method also includes:
Incremental backup data before current last time full backup is deleted.
6. according to the method described in claim 5, it is characterized in that, the increment by before current last time full backup
Backup Data is deleted, comprising:
After completing n-th full backup, the incremental backup data between n-th full backup and (n-1)th full backup is deleted
It removes, wherein n=2,3,4 ....
7. a kind of database restoring method, which is characterized in that the described method includes:
Database recovery instruction is received, determines the recovery object time point T0 of database to be restored, the database recovery instruction
In include database to be restored mark；
Obtain it is described recovery object time point T0 before, the full dose of full backup database the last time, T1 time to be restored it is standby
Part data；
According to the full backup data and T0 to the record data between T1, data recovery is carried out to database to be restored；
The record data are in T0 between T1, the modification to the database to be restored of record；
Incremental backup is carried out to the record data, the incremental backup refers to the number for only backing up modified after last backup every time
According to；
Wherein, the full backup time point, is determined by policy management element；
The policy management element determines the full backup time point, comprising:
It is quasi- to calculate each BACKUP TIME point according to the BACKUP TIME interval of the database in database group for the policy management element
Start the number of the database of full backup, if database number is greater than preset threshold value, most by storage space of database
The full backup time started at time point of big database is moved forward or rearward to the second start time.
8. the method according to the description of claim 7 is characterized in that it is described according to the full backup data and T0 to T1 it
Between record data, to database to be restored carry out data recovery, comprising:
Using the full backup data of full backup database the last time, T1 time to be restored, database recovery to be restored is arrived
T1 moment state；
Using T0 to the record data between T1, by database recovery to be restored to T0 moment state.
9. a kind of DB Backup device, which is characterized in that described device includes: full backup module, record data generation mould
Block, incremental backup module, wherein
The full backup module, for the full backup time point according to each database in database group, respectively to every
A database carries out full backup at its full backup time point；
The record data generation module, for recording to this between the time of full backup twice adjacent to any database
The modification of database generates record data；
The incremental backup module, for carrying out incremental backup to the record data, the incremental backup refers to only to be backed up every time
The data modified after last time backup；
Wherein, the full backup time point, is determined by policy management element；
The policy management element determines the full backup time point, comprising:
The policy management element calculates each BACKUP TIME according to the BACKUP TIME interval of the database in the database group
The number of the database of the quasi- starting full backup of point, if database number is greater than preset threshold value, by database purchase sky
Between full backup time started at time point of maximum database be moved forward or rearward to the second start time.
10. device according to claim 9, which is characterized in that the database group, comprising:
Under multi-tenant environment, a set independently of database existing for other tenants of respectively every tenant configuration.
11. device according to claim 9, which is characterized in that when the policy management element determines the full backup
Between point, comprising:
The policy management element according to the full backup time interval of each database in preset database group, or according to
Database number in database the group perhaps storage size of each database or the modification frequency of database, determine
The full backup time point of each database in database group.
12. device according to claim 9, which is characterized in that the incremental backup module is specifically used for:
To the record data real-time perfoming incremental backup；
Or
At pre-set incremental backup time point, incremental backup is carried out to the record data.
13. device according to claim 9, which is characterized in that described device further include: removing module, wherein
The removing module, for deleting the incremental backup data before current last time full backup.
14. device according to claim 13, which is characterized in that the removing module is specifically used for:
After completing n-th full backup, the incremental backup data between n-th full backup and (n-1)th full backup is deleted
It removes, wherein n=2,3,4 ....
15. a kind of database recovery device, which is characterized in that described device comprise determining that module, full backup obtain module and
Recovery module, wherein
The determining module, instruction is restored in library for receiving data, determines the recovery object time point T0 of database to be restored, institute
State the mark including database to be restored in database recovery instruction；
The full backup obtains module, for before obtaining the recovery object time point T0, database to be restored to be nearest
The full backup data of full backup time T1；
The recovery module, for according to the full backup data and T0 to the record data between T1, to number to be restored
Data recovery is carried out according to library；The record data are in T0 between T1, the modification to the database to be restored of record；
Incremental backup is carried out to the record data, the incremental backup refers to the number for only backing up modified after last backup every time
According to；
Wherein, the full backup time point, is determined by policy management element；
The policy management element determines the full backup time point, comprising:
It is quasi- to calculate each BACKUP TIME point according to the BACKUP TIME interval of the database in database group for the policy management element
Start the number of the database of full backup, if database number is greater than preset threshold value, most by storage space of database
The full backup time started at time point of big database is moved forward or rearward to the second start time.
16. device according to claim 15, which is characterized in that the recovery module is specifically used for:
Using the full backup data of full backup database the last time, T1 time to be restored, database recovery to be restored is arrived
T1 moment state；
Using T0 to the record data between T1, by database recovery to be restored to T0 moment state.
17. a kind of data base backup recovery system, any one DB Backup device and power including claim 9 to 14
Benefit requires 15 and 16 any one database recovery device.
18. a kind of data base backup recovery system, which is characterized in that the system comprises: full backup module, record data are raw
Module, recovery module and incremental backup module are obtained at module, determining module, full backup, wherein
The full backup module, for the full backup time point according to database, to database in each of which full backup
Time point carries out full backup；
The record data generation module, between the time of full backup twice adjacent to database, or whole note
The modification to the database is recorded, record data are generated；
The determining module, instruction is restored in library for receiving data, determines the recovery object time point of database to be restored；
The full backup obtains module, for obtaining before the recovery object time point, database nearest one to be restored
The full backup data of secondary full backup time；
The recovery module, for obtaining the full backup data and restoring object time point to the recovery object time
Record data before point, between the time of database the last time full backup to be restored, are treated according to the record data
Restore database and carries out data recovery；
The incremental backup module, for carrying out incremental backup to the record data, the incremental backup refers to only to be backed up every time
The data modified after last time backup；
Wherein, the full backup time point, is determined by policy management element；Wherein, the policy management element is used for
It is quasi- to calculate each BACKUP TIME point for the BACKUP TIME interval of each database in database group where the database
Start the number of the database of full backup, if database number is greater than preset threshold value, most by storage space of database
The full backup time started at time point of big database is moved forward or rearward to the second start time.
19. a kind of data base backup recovery system, which is characterized in that the system comprises: full backup module, record data are raw
Module, recovery module and incremental backup module are obtained at module, determining module, full backup, wherein
The full backup module, for the full backup time point according to each database in database group, respectively to every
A database carries out full backup at its full backup time point；
The record data generation module, between the time of full backup twice adjacent to any database, record pair
The modification of the database generates record data；
The determining module, instruction is restored in library for receiving data, determines the recovery object time point T0 of database to be restored, institute
State the mark including database to be restored in database recovery instruction；
The full backup obtains module, for before obtaining the recovery object time point T0, database to be restored to be nearest
The full backup data of full backup time T1；
The recovery module, for according to the full backup data and T0 to the record data between T1, to number to be restored
Data recovery is carried out according to library；
The incremental backup module, for carrying out incremental backup to the record data, the incremental backup refers to only to be backed up every time
The data modified after last time backup；
Wherein, the full backup time point, is determined by policy management element；
The policy management element determines the full backup time point, comprising:
The policy management element calculates each BACKUP TIME according to the BACKUP TIME interval of the database in the database group
The number of the database of the quasi- starting full backup of point, if database number is greater than preset threshold value, by database purchase sky
Between full backup time started at time point of maximum database be moved forward or rearward to the second start time.
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