CN107797883A - A kind of backup of memory database, restoration methods and device - Google Patents
A kind of backup of memory database, restoration methods and device Download PDFInfo
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- CN107797883A CN107797883A CN201610804972.5A CN201610804972A CN107797883A CN 107797883 A CN107797883 A CN 107797883A CN 201610804972 A CN201610804972 A CN 201610804972A CN 107797883 A CN107797883 A CN 107797883A
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- database
- data
- output file
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- memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1448—Management of the data involved in backup or backup restore
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/21—Design, administration or maintenance of databases
Abstract
The invention discloses a kind of backup of memory database, restoration methods and device.The backup method includes：Database table to be backed up is exported from memory database；Data in the database table are write into output file with length value L V format；By output file storage into default storing directory.The restoration methods include：Output file is exported from storing directory；Data in the output file are LV forms；Data in the output file are loaded into database table, complete the recovery of memory database.The present invention carries out backup logic based on LV forms to the data in memory database, without setting separator, so, when recovering memory database, memory database can be accurately recovered, the problem of field value of separator and output file conflicts will not occur.
Description
Technical field
The present invention relates to data backup and resume technical field, more particularly to a kind of backup of memory database, recovers
Method and apparatus.
Background technology
At present, the backup mode of database includes：Backup logic.Backup logic is also referred to as " data export ", and logic is standby
Part is that the form that the data in database table can be parsed with database is stored.
Specifically, when carrying out backup logic, pass through SQL (SQL, Structured Query
Language) order exports the data of each table in database, output file of the write-in with set form.Need for this is defeated
Go out file and specify (self-defined) separator, using in each record in the table of separator partition data storehouse and each record of segmentation
Each field.However, it is this with the backup logic mode for specifying separator, if the field value and separator of output file
Clash, such as the field value of output file is identical with field seperator, when carrying out database recovery, data will be caused to damage
Bad or loss.
The content of the invention
The present invention provides a kind of backup of memory database, restoration methods and device, to solve existing backup logic and
In reset mode, if the field value conflict of separator and output file, in database recovery, can cause corrupted data or
The problem of loss.
In order to solve the above-mentioned technical problem, the present invention solves by the following technical programs：
The invention provides a kind of backup method of memory database, including：Exported from memory database to be backed up
Database table；Data in the database table are write into output file with length value L V format；The output file is stored
Into default storing directory.
Wherein, before database table to be backed up is exported from memory database, in addition to：Stop the internal storage data
The business in storehouse.
Wherein, the output file is binary file.
Present invention also offers a kind of restoration methods of memory database, including：Output file is exported from storing directory；
Data in the output file are LV forms；Data in the output file are loaded into database table, complete internal memory
The recovery of database.
Wherein, the output file is binary file.
Present invention also offers a kind of back-up device of memory database, including：Export module, for from memory database
Middle export database table to be backed up；Writing module, for the data in the database table to be write with length value L V format
Output file；Memory module, for the output file to be stored into default storing directory.
Wherein, described device also includes control module；The control module, for from memory database export treat it is standby
Before the database table of part, stop the business of the memory database.
Wherein, the output file is binary file.
Present invention also offers a kind of recovery device of memory database, including：Acquisition module, for from storing directory
Obtain output file；Data in the output file are LV forms；Load-on module, for by the data in the output file
It is loaded into database table, completes the recovery of memory database.
Wherein, the output file is binary file.
The present invention has the beneficial effect that：
The present invention carries out backup logic based on LV forms to the data in memory database, without setting separator, so,
When recovering memory database, memory database can be accurately recovered, the field value of separator and output file will not occur
The problem of conflict.
Brief description of the drawings
Fig. 1 is the flow chart of the backup method of memory database according to an embodiment of the invention；
Fig. 2 is the data structure schematic diagram of LV forms according to an embodiment of the invention；
Fig. 3 is the flow chart of the restoration methods of memory database according to an embodiment of the invention；
Fig. 4 is the particular flow sheet of the backup method of memory database according to an embodiment of the invention；
Fig. 5 is the step of performing export (swf) command by backup logic instrument loadoutall according to an embodiment of the invention
Flow chart；
Fig. 6 is that according to an embodiment of the invention performed by backup logic instrument loadoutall imports the step of ordering
Flow chart；
Fig. 7 is the structure chart of the back-up device of memory database according to an embodiment of the invention；
Fig. 8 is the structure chart of the recovery device of memory database according to an embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention will be described in further detail.It is it should be appreciated that described herein
Specific embodiment only to explain the present invention, not limit the present invention.
Embodiment one
The present embodiment provides a kind of backup method of memory database, and Fig. 1 is internal memory number according to an embodiment of the invention
According to the flow chart of the backup method in storehouse.
Step S110, database table to be backed up is exported from memory database.
Memory database refers to for data to be placed on the database directly operated in internal memory.Include one in memory database
Or multiple database tables.
Before database table to be backed up is exported from memory database, the industry of the memory database can also be stopped
Business, memory database is avoided to have new data write-in.
Under a memory database process, one or more memory databases can be created.The present embodiment is directed to single-unit
The memory database of point (memory database process) is backed up.
Step S120, the data in the database table are write into output text with LV (Length Value, length value) form
Part.
Data in database table include a line or multirow records, and often row record includes one or more fields.
Data in output file are the backups to the data in memory database.
In memory database, if the quantity of database table is multiple, respectively by the data in each database table
Backuped to LV forms in an output file, therefore the corresponding database table of an output file.By in database table
Data with LV forms write output file after, the data format of the data in output file is LV forms.
Step S130, by output file storage into default storing directory.
Output file is binary file, and so, the data in output file are binary data.
Storing directory is the position of output file storage., respectively will be per number if the quantity of database table is multiple
According to output file storage corresponding to the table of storehouse into the storing directory.
For the LV forms that are related in the present embodiment specifically：
The data structure of LV forms includes：Head, the line number recorded in database table, often in row record field quantity,
The length (Length) and field value (Value) of field.
Head is to be identified corresponding to LV forms.Such as：fb48ce13-d4c1-4571-9d79-d9a463a2a1b1.
The line number recorded in database table, often in row record the quantity of field and the length of field be all character type data and
Account for 4 bytes.Field value can also be character type data.The length of field and the quantity of field value are one or more.
Fig. 2 is the data structure schematic diagram according to the LV forms of one embodiment of the invention.The data structure of LV forms is：Head
Portion is " fb48ce13-d4c1-4571-9d79-d9a463a2a1b1 ", followed by the field quantity of every row record, database table
The line number of middle record, the length of field 1, the value of field 1, the length of field 1, the value ... ... of field 2, field n length, field n
Value.Wherein, n is more than or equal to 1.
In the present embodiment, data are written in output file using LV forms, between record and record, field and
Without using separator between field, the field value in output file and separator conflict, caused data recovery failure are avoided
The problem of.Using binary file data storage, it can be ensured that data safety.
Embodiment two
Based on the backup method of above-mentioned memory database, the present embodiment provides a kind of restoration methods of memory database, Fig. 3
It is the flow chart of the restoration methods of memory database according to an embodiment of the invention.
Step S310, obtains output file from storing directory；Data in the output file are LV forms.
The data in the database table of memory database, and an output file corresponding one have been backed up in output file
Individual database table.
Step S320, the data in the output file are loaded into database table, complete the recovery of memory database.
In target memory database, database table is emptied, it is empty table to make the database table；By what is stored in output file
The data export of LV forms, and be loaded into the database table.
If the quantity of output file is multiple, this multiple output file is operated one by one, by output file
Data recovery into database table.After the operation to multiple output files is all completed, the recovery of memory database is completed.
Embodiment three
The present embodiment is further described through to the backup method of memory database.Fig. 4 is implemented according to the present invention one
The particular flow sheet of the backup method of the memory database of example.
Step S410, open memory database and stop the business of the memory database.
In the present embodiment, memory database is ebase memory databases.
Step S420, by backup logic instrument loadoutall, the number in database table is exported in memory database
According to, and derived data are write into output file with LV forms.
Step S430, by output file storage into default storing directory.
Due to running one or more memory databases under memory database process, it is possible to pass through backup logic
Instrument loadoutall, export the table data of all memory databases or export the table data of specified memory database, and with
LV forms write output file.Table data refer to the data in database table.
Backup logic instrument loadoutall (export) is executable file.Can be in the middle calling logic of SQL clients
Backup tool loadoutall.Include in backup logic instrument loadoutall：Order line for depositing output file enters
The storage path of data base configuration file and data dictionary file dict storage road of mouth parameter, memory database to be backed up
Footpath.
Further, export (swf) command is performed by backup logic instrument loadoutall, exports all memory databases
Table data or the table data for exporting specified memory database, and output file is write with LV forms.
If exporting the table data of all memory databases, it can be performed and led by backup logic instrument loadoutall
Go out order：Loadoutall–LV‘/home/ebase/loadoutall’.The export (swf) command represents to export all memory databases
All table data, and with LV forms storage to path ' under/home/ebase/loadoutall ', formed output data.
If exporting the table data of specified memory database, it can be performed and led by backup logic instrument loadoutall
Go out order：Loadoutall–LV database_name‘/home/ebase/loadoutall’.The export (swf) command represents export
All table data of entitled database_name memory database, and path '/home/ebase/ is arrived with the storage of LV forms
Under loadoutall ', output data is formed.Database_name can be depending on specific database table title.
As shown in figure 5, the process that export (swf) command is performed by backup logic instrument loadoutall is as follows：
Step S510, reading order line entry parameter, obtain storing directory.
Backup logic instrument loadoutall reading order suction parameters, obtain storing directory.Order line suction parameter bag
Include：The storing directory of output file.Storing directory is the path of the deposit position of output file.
Step S520, data base configuration file is parsed, obtain the essential information of memory database to be backed up.
The data base configuration file is the data base configuration file of memory database to be backed up.Memory database it is basic
Information includes：The IP (Internet Protocol Address, Internet protocol address) of memory database binding and port
Number.
The storage path of backup logic instrument loadoutall reading database configuration files；According to data base configuration file
Storage path, obtain the data base configuration file of memory database；By parsing data base configuration file, configured from database
The IP address and port numbers of memory database binding are obtained in file.
Step S530, data dictionary file is parsed, obtain the title of all database tables in the memory database.
The data dictionary file is the data dictionary file of memory database to be backed up.In data dictionary file includes
The information of all database tables in deposit data storehouse.
Backup logic instrument loadoutall reads the storage of the data dictionary file of main memory database table derived from needs
Path；According to the storage path of the data dictionary file, the data dictionary file of the memory database is obtained, by parsing the number
According to dictionary file, the title of all database tables in the memory database is obtained.
Step S540, memory database is connected with port numbers according to the IP address that memory database is bound.
Step S550, according to the title of database table in the memory database, a number is exported from the memory database
According to storehouse table, the data in the database table are written in output file with LV forms.
The corresponding output file of one database table.The output file of LV forms is binary file.
Database table to be backed up in memory database can be exported by performing the SQL statement pre-set.The SQL
Sentence is used to export to the data in database table in one output file, and can be exported by performing once the SQL statement by one
Database table, form an output file.The SQL statement is as follows：
Load data outfile‘/home/ebase/table_name’from table table_name LV_
format。
The SQL statement represents ' to export title under/home/ebase/table_name ' from path with LV_format forms
For the data of table_name database table.LV_format forms refer to LV forms.
The title of output file can be set according to corresponding database table.Such as：Make the title sum of output file
Title according to storehouse table is identical.
Step S560, judges whether database table to be backed up in the memory database has all been exported；If so, then hold
Row step S550；If it is not, then perform step S570.
Step S570, all output files are all stored in storing directory.
It will be appreciated by those skilled in the art that the present invention can obtain an output file, directly the output file is deposited
Store up in storing directory, all output files can also be stored into storing directory together after all output files are obtained
In.
The present embodiment can carry out full dose backup logic, that is, the data the present embodiment backed up in all memory databases also props up
Hold the backup logic that the single memory database specified to user and/or single database table are carried out.The present embodiment not brush containing dirty pages.
The file format of the present embodiment backup logic generation does not need separator, avoids user from setting extensive caused by separator
Multiple abnormal problem.Further, the file content of the present embodiment backup logic generation is binary data, and binary data can not
It is immediately seen data content, it is ensured that data safety.
Example IV
The present embodiment is further described through to the restoration methods of memory database.
The recovery of memory database is that the output file for backing up the table data for having former memory database is imported into target
In deposit data storehouse, the recovery to former memory database is completed.
The present embodiment is performed by backup logic instrument Loadinall (importing) and imports order, is led in memory database
Enter data of the backup in output file, recover memory database.Further, backup logic instrument Loadinall is can
Perform file.Can in SQL clients calling logic backup tool Loadinall, and perform importing order.In output file
The data formats of data be LV forms.
Include in backup logic instrument Loadinall：For depositing the order line suction parameter of output file, in target
The storage path of the data base configuration file in deposit data storehouse.In the present embodiment, also stored in backup logic instrument Loadinall
There is the storage path of the data dictionary file of former memory database.
If importing the table data of all memory databases, it can be performed and led by backup logic instrument Loadinall
Enter order：Loadinall–LV‘/home/ebase/loadinall’.The importing order is introduced into path '/home/ebase/
The data in output file under loadinall ', to recover data corresponding to each output file in memory database
Storehouse table.
If importing the table data of specified memory database, it can be performed and led by backup logic instrument Loadinall
Enter order：Loadinall–LV database_name‘/home/ebase/loadinall’.The importing order is to be used to import
Path ' under/home/ebase/loadinall ', the data in entitled database_name output file, so as to inside
Entitled database_name database table is recovered in deposit data storehouse.Title database_name is merely illustrative, specific name
Title can be depending on the title of database table.
As shown in fig. 6, it is as follows to perform the step of importing order by backup logic instrument Loadinall：
Step S610, reading order row enter ginseng, obtain the storing directory of output file.
Backup logic instrument Loadinall reading order suction parameters, obtain storing directory.Stored in the storing directory
Backup has the output file of the table data of former memory database.
Step S620, data base configuration file is parsed, obtain the essential information of target memory database.
The data base configuration file is target memory wide area information server configuration file.Target memory database it is basic
Information includes：The IP address and port numbers of target memory database binding.
Step S630, data dictionary file is parsed, obtain the title of all database tables in former memory database.
The data dictionary file is the data dictionary file of former memory database.
Backup logic instrument Loadinall reads the storage path of the data dictionary file of former main memory database table；According to
The storage path of the data dictionary file, the data dictionary file of the memory database is obtained, by parsing data dictionary text
Part, obtain the title of all database tables in former memory database.
Step S640, according to the title of database table in former memory database, corresponding export is obtained from storing directory
File.
An output file is only obtained from storing directory every time, and does not repeat to obtain same output file.
Step S650, according to the essential information of target memory database, the data in the output file are loaded into target
In one database table of memory database.
Step S660, judges whether all database tables in former memory database are all recovered to complete；If it is not, then perform step
Rapid S640；If so, then terminating flow, the recovery of former memory database is completed.
Travel through all database tables in target memory database；In target memory database, one by one to every data
Storehouse table carries out table data importing.Table data importing for every database table includes：Clean the database table；According to former internal memory
The title of database table in database, corresponding with title output file is obtained from storing directory, and by the output file
In data imported into the database table after the cleaning.After all output files all import completion, former memory database
Recover to complete.
In target memory database, the SQL statement for importing data can be performed for the database table after cleaning,
Data are imported into the database table.The SQL statement is as follows：
Load data infile‘/home/ebase/table_name’into table table_name LV_
format。
The SQL statement represents that ' the entitled table_name's of export is defeated in/home/ebase/table_name ' from path
Go out file, the storage format of the data in the output file is LV_format.LV_format forms refer to LV forms.Title
Table_name is merely illustrative, and specific name can be depending on the title of output file, and the title of output file is according to data
Depending on the title of storehouse table.
Select operations are performed in SQL clients, can inquire which table data has been imported in database table.
When the data in output file are imported into database table, if the field quantity in output file is less than number
According to storehouse table defined word segment number, then null value is assigned in database table to be less than the field of table data importing；If in output file
Field quantity be more than database table defined word segment number, then the part field blocked in output file imported into database table
In.
Embodiment five
The present embodiment provides a kind of back-up device of memory database.Fig. 7 is internal memory number according to an embodiment of the invention
According to the structure chart of the back-up device in storehouse.
Export module 710, for exporting database table to be backed up from memory database.
Writing module 720, for the data in the database table to be write into output file with length value L V format.
Memory module 730, for the output file to be stored into default storing directory.
In one embodiment, described device also includes control module (not shown)；The control module, for
Before database table to be backed up is exported from memory database, stop the business of the memory database.
In another embodiment, the output file is binary file.
The function of device described in the present embodiment is carried out in the embodiment of the method shown in Fig. 1, Fig. 2, Fig. 4 and Fig. 5
Description, therefore not detailed part in the description of the present embodiment, may refer to the related description in previous embodiment, do not do herein superfluous
State.
Embodiment six
The present embodiment provides a kind of recovery device of memory database.Fig. 8 is internal memory number according to an embodiment of the invention
According to the structure chart of the recovery device in storehouse.
The recovery device of the memory database includes：
Acquisition module 810, for obtaining output file from storing directory；Data in the output file are LV lattice
Formula.
Load-on module 820, for the data in the output file to be loaded into database table, complete memory database
Recovery.
In one embodiment, the output file is binary file.
The function of device described in the present embodiment is described in the embodiment of the method shown in Fig. 3 and Fig. 6, therefore
Not detailed part, may refer to the related description in previous embodiment, will not be described here in the description of the present embodiment.
Although being example purpose, the preferred embodiments of the present invention are had been disclosed for, those skilled in the art will recognize
Various improvement, increase and substitution are also possible, and therefore, the scope of the present invention should be not limited to above-described embodiment.
Claims (10)
- A kind of 1. backup method of memory database, it is characterised in that including：Database table to be backed up is exported from memory database；Data in the database table are write into output file with length value L V format；By output file storage into default storing directory.
- 2. the method as described in claim 1, it is characterised in that exported from memory database database table to be backed up it Before, in addition to：Stop the business of the memory database.
- 3. method as claimed in claim 1 or 2, it is characterised in that the output file is binary file.
- A kind of 4. restoration methods of memory database, it is characterised in that including：Output file is exported from storing directory；Data in the output file are LV forms；Data in the output file are loaded into database table, complete the recovery of memory database.
- 5. method as claimed in claim 4, it is characterised in that the output file is binary file.
- A kind of 6. back-up device of memory database, it is characterised in that including：Export module, for exporting database table to be backed up from memory database；Writing module, for the data in the database table to be write into output file with length value L V format；Memory module, for the output file to be stored into default storing directory.
- 7. device as claimed in claim 6, it is characterised in that described device also includes control module；The control module, for before database table to be backed up is exported from memory database, stopping the internal memory number According to the business in storehouse.
- 8. device as claimed in claims 6 or 7, it is characterised in that the output file is binary file.
- A kind of 9. recovery device of memory database, it is characterised in that including：Acquisition module, for obtaining output file from storing directory；Data in the output file are LV forms；Load-on module, for the data in the output file to be loaded into database table, complete the recovery of memory database.
- 10. device as claimed in claim 9, it is characterised in that the output file is binary file.
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| CN201610804972.5A CN107797883A (en) | 2016-09-06 | 2016-09-06 | A kind of backup of memory database, restoration methods and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599982A (en) * | 2018-03-14 | 2018-09-28 | 华为技术有限公司 | Data reconstruction method and relevant device |
| CN109284260A (en) * | 2018-10-16 | 2019-01-29 | 平安证券股份有限公司 | Large data files read method, device, computer equipment and storage medium |
| CN109344004A (en) * | 2018-09-03 | 2019-02-15 | 郑州云海信息技术有限公司 | A kind of memory database backup management method, device, terminal and storage medium |
| US11656947B2 (en) | 2020-06-19 | 2023-05-23 | International Business Machines Corporation | Data set recovery from a point-in-time logical corruption protection copy |
-
2016
- 2016-09-06 CN CN201610804972.5A patent/CN107797883A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599982A (en) * | 2018-03-14 | 2018-09-28 | 华为技术有限公司 | Data reconstruction method and relevant device |
| CN108599982B (en) * | 2018-03-14 | 2021-02-12 | 华为技术有限公司 | Data recovery method and related equipment |
| CN109344004A (en) * | 2018-09-03 | 2019-02-15 | 郑州云海信息技术有限公司 | A kind of memory database backup management method, device, terminal and storage medium |
| CN109284260A (en) * | 2018-10-16 | 2019-01-29 | 平安证券股份有限公司 | Large data files read method, device, computer equipment and storage medium |
| CN109284260B (en) * | 2018-10-16 | 2023-10-13 | 平安证券股份有限公司 | Big data file reading method and device, computer equipment and storage medium |
| US11656947B2 (en) | 2020-06-19 | 2023-05-23 | International Business Machines Corporation | Data set recovery from a point-in-time logical corruption protection copy |
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Effective date of registration: 20180502 Address after: 518057 five floor, block A, ZTE communication tower, Nanshan District science and Technology Park, Shenzhen, Guangdong. Applicant after: ZTE Corporation Address before: 210000 68 Bauhinia Road, Yuhuatai District, Nanjing, Jiangsu Applicant before: Nanjing Zhongxing New Software Co., Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180313 |