CN105045678B - Database restoring method and device - Google Patents
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Abstract
The present invention discloses embodiment and provides a kind of database restoring method and device, the Database Systems for being formed by master library and from library, when initial described in data from library it is identical as the data of the master library；The method includes：Completed operation on the master library is obtained in chronological order；After getting the operation every time, identical operation is executed from library described after delay preset duration based on the deadline of the operation currently obtained；When the master library when the error occurs, determining leads to the faulty operation of mistake；Judge whether the faulty operation has executed described from library；If the faulty operation is not yet executed described from library, the data of the master library are restored using the data from library.The scheme that the present invention discloses embodiment can be with the state of the previous operation of Exact recovery to faulty operation, this just largely avoids the loss of data, loss is reduced to it is as small as possible, improve database operation when safety and reliability.
Description
Technical field
The present invention, which discloses, is related to database technology more particularly to database restoring method and device.
Background technology
In the operating with of database, inevitably it will appear due to the reasons such as software program problem or attended operation error
Data in database have been carried out the modification of mistake by the case where performing the database operating instruction of mistake.These maloperations are light
Then influence data accuracy, it is heavy then lead to heavy economic losses, such as order information mistake, user account remaining sum mistake etc..
In the related art, it in order to retrieve a loss when there is maloperation, eliminates the effects of the act, traditional method is mostly
Timed backup database, such as backup is primary daily, it, can be by database recovery to when backup then when needing to restore data
State.
Invention content
To overcome the problems in correlation technique, the present invention discloses a kind of database restoring method of offer and device, with
Promote safety and reliability when database operation.
According to the present invention disclose embodiment in a first aspect, provide a kind of database restoring method, the method for by
Master library and the Database Systems formed from library, when initial described in data from library it is identical as the data of the master library；The method
Including：
Completed operation on the master library is obtained in chronological order；
After getting the operation every time, postpone preset duration based on the deadline of the operation currently obtained
Execute identical operation from library described afterwards；
When the master library when the error occurs, determining leads to the faulty operation of mistake；
Judge whether the faulty operation has executed described from library；
If the faulty operation is not yet executed described from library, using the data from library to the master library
Data are restored.
Optionally, described to obtain completed operation on the master library in chronological order, including：
Sequence reads the operation being documented in master library operation log.
Optionally, it is described based on the deadline of the operation currently obtained postpone preset duration after it is described from
Identical operation is executed on library, including：
Obtain the current time from library；
When whether the difference of the deadline and the current time that judge the operation currently obtained are less than described default
It is long；
If it is less than the preset duration, then return acquisition it is described from the current time in library the step of；
If it is greater than or equal to the preset duration, then identical operation is executed with the operation from library described.
Optionally, described that the data of the master library are restored from the data in library described in, including：
It is described the faulty operation has been executed from library before operation；
The data of the master library are repaired using the data current from library, so that the data of the master library are restored
State to before the execution faulty operation.
Optionally, the method further includes：
It is modified to the preset duration according to the input of user.
According to the second aspect of the embodiment of the present disclosure, a kind of database recovery device is provided, described device is used for by master library
With the Database Systems formed from library, when initial described in data from library it is identical as the data of the master library；Described device includes：
Master library operation acquisition module is got every time for obtaining completed operation on the master library in chronological order
After the operation, trigger from library async backup module；
From library async backup module, the deadline for operating the operation that acquisition module currently obtains with master library is
Basis described executes identical operation after postponing preset duration from library；
Recovery judgment module is used to work as the master library when the error occurs, the determining faulty operation for leading to mistake, described in judgement
Whether faulty operation has executed described from library, if the faulty operation is not yet executed described from library, triggers
Data recovery module；
Data recovery module described is restored the data of the master library from the data in library for using.
Optionally, the master library operation acquisition module includes：
Sequence reading submodule reads the operation being documented in master library operation log for sequence；
Backup triggering submodule triggers after getting the operation every time from library async backup module.
Optionally, described to include from library async backup module：
Time acquisition submodule, for obtaining the current time from library；
Time compares submodule, deadline and the current time of the operation for judging to judge currently to obtain
Difference whether be less than the preset duration, if it is less than the preset duration, then triggered time acquisition submodule, if it is greater than or
Equal to the preset duration, then identical operation is executed with the operation from library described.
Optionally, the data recovery module includes：
Restore prepare submodule, for it is described the faulty operation has been executed from library before operation；
Data repair submodule, for use it is described the data of the master library are repaired from the current data in library, with
The data of the master library are made to be restored to the state before executing the faulty operation.
Optionally, described device further includes：
Duration modified module, for being modified to the preset duration according to the input of user.
According to the third aspect of the embodiment of the present disclosure, a kind of database recovery device is provided, described device is used for by master library
With the Database Systems formed from library, when initial described in data from library it is identical as the data of the master library, described device includes：
Processor；
Memory for storing processor-executable instruction；
Wherein, the processor is configured as：
Completed operation on the master library is obtained in chronological order；
After getting the operation every time, postpone preset duration based on the deadline of the operation currently obtained
Execute identical operation from library described afterwards；
When the master library when the error occurs, determining leads to the faulty operation of mistake；
Judge whether the faulty operation has executed described from library；
If the faulty operation is not yet executed described from library, using the data from library to the master library
Data are restored.
The technical scheme provided by this disclosed embodiment can include the following benefits：
In the related art, when occur mistake need restore data when because very may be used between current time and backup time
Many operations can be had occurred that, but the relevant technologies can only be restored to backup time, it is possible that the loss of data can be caused.And
In disclosure scheme, the state of the previous operation of faulty operation can be restored to.In other words, the relevant technologies are restoring data
When may be only accurate to previous " moment ", and disclosure scheme then can be as accurate as previous " operation ", this just largely keeps away
The loss for having exempted from data, loss is reduced to it is as small as possible, improve database operation when safety and reliability.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
The disclosure can be limited.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the present invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 is a kind of flow chart of database restoring method shown according to an exemplary embodiment；
Fig. 2 is to replicate the schematic diagram that master library operates from library according to shown in an exemplary embodiment；
Fig. 3 is a kind of flow chart of database restoring method shown according to an exemplary embodiment；
Fig. 4 is a kind of flow chart of database restoring method shown according to an exemplary embodiment；
Fig. 5 is a kind of block diagram of database recovery device shown according to an exemplary embodiment；
Fig. 6 is a kind of block diagram of database recovery device shown according to an exemplary embodiment；
Fig. 7 is a kind of block diagram of database recovery device shown according to an exemplary embodiment；
Fig. 8 is a kind of block diagram of database recovery device shown according to an exemplary embodiment；
Fig. 9 is a kind of block diagram of database recovery device shown according to an exemplary embodiment；
Figure 10 is a kind of block diagram of device for database recovery shown according to an exemplary embodiment.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects being described in detail in claims, of the invention.
Fig. 1 is a kind of flow chart of database restoring method shown according to an exemplary embodiment.The method is available
In the Database Systems formed by master library and from library, when initial described in data from library it is identical as the data of the master library.
It is shown in Figure 1, the method may include：
In step S101, completed operation on the master library is obtained in chronological order.
For example, described obtain completed operation on the master library in chronological order, may include：
Sequence reads the operation being documented in master library operation log.
Usually after completing an operation on database, database can be sequentially recorded the lower operation in its operation log
And the time completed.So reading the operation log of master library, completed operation on master library can be got one by one.
In step s 102, after getting the operation every time, using the deadline of the operation currently obtained as base
Identical operation is executed from library described after plinth delay preset duration.
Two above step can be regarded as utilizing the process for backing up master library from library.
Execute the operation that operation identical with master library alternatively referred to as replicates master library.For size the present embodiment of preset duration
And be not limited, user can be configured at the beginning as needed, such as could be provided as 30 minutes；In addition can also
It is modified to the preset duration according to the input of user.
Backup database from library as master library, storage data identical with master library when initial.And backup procedure is then one
Kind async backup also enables and occurring similarly from library during master library changes and (completes various operations on master library)
Variation, and compared with master library, preset duration can be postponed from the variation in library, such as postpone 30 minutes.
As example, the scene can be found in shown in Fig. 2, and 201 be master library in fig. 2, and 202 be to be held from the operation on library, master library
The operation log of master library is written after row, and can then read the operation log of master library by I/O threads from library, master library is grasped
The operation made in daily record is written to from the pending operation list in library, in order passes through each operating delay after 30 minutes
SQL threads are being executed from library.
It can be seen that, the operations on master library can also be replicated from library in table 1 with further reference to shown in table 1, and
From the operating delay all more identical than on master library of the operation on library 30 minutes.
Table 1
| Time | Operation on master library | From the operation on library |
| 05:30 | Operation 1 | |
| 05:33 | Operation 2 | |
| 05:42 | Operation 3 | |
| ... | ... | |
| 06:00 | ... | Operation 1 |
| 06:03 | ... | Operation 2 |
| 06:12 | ... | Operation 3 |
| ... | ... | ... |
In step s 103, when the master library when the error occurs, determining leads to the faulty operation of mistake.
For example, can be positioned to faulty operation in the operation log of master library.
In step S104, judge whether the faulty operation has executed described from library.
In step S105, if the faulty operation is not yet executed described from library, the number from library is used
Restore according to the data to the master library.
Three above step can be regarded as utilizing the process for restoring master library from library.
In this way when finding that master library occurs wrong, if mistake is in default after executing the faulty operation on master library
It is found in length, namely finds to have not carried out identical faulty operation from library when mistake, then the mistake can be repaired, it can
Master library is repaired using from the data in library, to retrieve the data of master library.
It should be noted that in some cases, if error detection is later, finding to have been carried out from library when mistake
Identical faulty operation, then just needing other technologies to restore to master library, this kind of situation is not in the discussion model of the disclosure
Within farmland.
It is shown in Figure 3, in the present embodiment or the disclosure other some embodiments, with the operation that currently obtains
Identical operation is executed from library described after delay preset duration based on deadline, may include：
In step S301, the current time from library is obtained.
In step s 302, whether the difference of the deadline and the current time that judge the operation currently obtained are small
In the preset duration；
In step S303, if it is less than the preset duration, then return to step S301.
In step s 304, it if it is greater than or equal to the preset duration, is then executed and the operation from library described
Identical operation.
In some cases, it is desirable to when being restored, the operation to before faulty operation may be had not carried out from library, at this time
For the state before enabling master library to be restored to faulty operation, the progress that master library is pulled up to from library can be made.For example, it is assumed that mistake
Operation is operation 18, but is only carried out from library to operation 10, goes to operation 17 always from library then can first allow, that is, reaches main
State of the library before executing operation 18, to allow master library by the state being restored to from library before operation 18.
So shown in Figure 4, in the present embodiment or the disclosure other some embodiments, the data from library are used
The data of the master library are restored, may include：
In step S401, it is described the faulty operation has been executed from library before operation.
In step S402, the data of the master library are repaired using the data current from library, so that described
The data of master library are restored to the state before executing the faulty operation.
In disclosure other embodiment, other modes can also be used using the data from library to the master certainly
The data in library are restored, for example, it is also possible to enable the step of stopping executing master library from library when the error occurs, then use from library
On data master library is repaired, then the step of before having executed faulty operation on master library, to can also make the number of master library
According to the state being restored to before executing the faulty operation.To this present embodiment and it is not limited.
In the related art, when occur mistake need restore data when because very may be used between current time and backup time
Many operations can be had occurred that, but the relevant technologies can only be restored to backup time, it is possible that the loss of data can be caused.And
In disclosure scheme, the state of the previous operation of faulty operation can be restored to.In other words, the relevant technologies are restoring data
When may be only accurate to previous " moment ", and disclosure scheme then can be as accurate as previous " operation ", this just largely keeps away
The loss for having exempted from data, loss is reduced to it is as small as possible, improve database operation when safety and reliability.
Fig. 5 is a kind of block diagram of database recovery device shown according to an exemplary embodiment.Described device be used for by
Master library and the Database Systems formed from library, when initial described in data from library it is identical as the data of the master library.
Shown in Figure 5, described device includes：
Master library operates acquisition module 501, for obtaining completed operation on the master library in chronological order, obtains every time
To after the operation, trigger from library async backup module；
From library async backup module 502, when the completion of the operation for currently being obtained with master library operation acquisition module
Between based on, described identical operation is executed from library after postponing preset duration；
Restore judgment module 503, for working as the master library when the error occurs, determines the faulty operation for leading to mistake, judge
Whether the faulty operation has executed described from library, if the faulty operation is not yet executed described from library,
Trigger data recovery module；
Data recovery module 504 described is restored the data of the master library from the data in library for using.
It is shown in Figure 6, it is described from library async backup module in the present embodiment or the disclosure other some embodiments
502 may include：
Time acquisition submodule 601, for obtaining the current time from library；
Time compares submodule 602, deadline of the operation for judging to judge currently to obtain with it is described currently
Whether the difference of time is less than the preset duration, if it is less than the preset duration, then triggered time acquisition submodule, if greatly
In or equal to the preset duration, then identical operation is executed with the operation from library described.
Shown in Figure 7, in the present embodiment or the disclosure other some embodiments, the data recovery module 504 can
To include：
Restore prepare submodule 701, for it is described the faulty operation has been executed from library before operation；
Data repair submodule 702, for use it is described the data of the master library are repaired from the current data in library,
So that the data of the master library are restored to the state before executing the faulty operation.
Shown in Figure 8, in the present embodiment or the disclosure other some embodiments, the master library operates acquisition module
501 may include：
Sequence reading submodule 801 reads the operation being documented in master library operation log for sequence；
Backup triggering submodule 802 triggers after getting the operation every time from library async backup module.
Shown in Figure 9, in the present embodiment or the disclosure other some embodiments, described device can also include：
Duration modified module 505, for being modified to the preset duration according to the input of user.
About the device in above-described embodiment, wherein modules execute the concrete mode of operation in related this method
Embodiment in be described in detail, explanation will be not set forth in detail herein.
In the related art, when occur mistake need restore data when because very may be used between current time and backup time
Many operations can be had occurred that, but the relevant technologies can only be restored to backup time, it is possible that the loss of data can be caused.And
In disclosure scheme, the state of the previous operation of faulty operation can be restored to.In other words, the relevant technologies are restoring data
When may be only accurate to previous " moment ", and disclosure scheme then can be as accurate as previous " operation ", this just largely keeps away
The loss for having exempted from data, loss is reduced to it is as small as possible, improve database operation when safety and reliability.
The disclosure also discloses a kind of database recovery device, database of the described device for being formed by master library and from library
System, when initial described in data from library it is identical as the data of the master library, described device includes：
Processor；
Memory for storing processor-executable instruction；
Wherein, the processor is configured as：
Completed operation on the master library is obtained in chronological order；
After getting the operation every time, postpone preset duration based on the deadline of the operation currently obtained
Execute identical operation from library described afterwards；
When the master library when the error occurs, determining leads to the faulty operation of mistake；
Judge whether the faulty operation has executed described from library；
If the faulty operation is not yet executed described from library, using the data from library to the master library
Data are restored.
The disclosure also discloses a kind of non-transitorycomputer readable storage medium, when the instruction in the storage medium by
When the processor of equipment executes so that equipment is able to carry out a kind of database restoring method, the method be used for by master library and from
The Database Systems of library composition, when initial described in data from library it is identical as the data of the master library, the method includes：
Completed operation on the master library is obtained in chronological order；
After getting the operation every time, postpone preset duration based on the deadline of the operation currently obtained
Execute identical operation from library described afterwards；
When the master library when the error occurs, determining leads to the faulty operation of mistake；
Judge whether the faulty operation has executed described from library；
If the faulty operation is not yet executed described from library, using the data from library to the master library
Data are restored.
Figure 10 is a kind of block diagram of device for database recovery shown according to an exemplary embodiment.For example, should
Device 2900 may be provided as a server.
Referring to Fig.1 0, device 2900 includes processing component 2922, further comprises one or more processors, Yi Jiyou
Memory resource representated by memory 2932, can be by the instruction of the execution of processing component 2922, such as using journey for storing
Sequence.The application program stored in memory 2932 may include it is one or more each correspond to one group of instruction mould
Block.In addition, processing component 2922 is configured as executing instruction, the method to execute above-mentioned server side.
Device 2900 can also include that a power supply module 2926 be configured as the power management of executive device 2900, one
Wired or wireless network interface 2950 is configured as device 2900 being connected to network and input and output (I/O) interface
2958.Device 2900 can be operated based on the operating system for being stored in memory 2932, such as Windows ServerTM, Mac
OS XTM, UnixTM, LinuxTM, FreeBSDTM or similar.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the present invention
Its embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the present invention and includes the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by appended
Claim is pointed out.
It should be understood that the invention is not limited in the precision architectures for being described above and being shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (9)
1. a kind of database restoring method, which is characterized in that Database Systems of the method for being formed by master library and from library,
Data described in when initial from library are identical as the data of the master library；The method includes：
Completed operation on the master library is obtained in chronological order；
After getting the operation every time, based on the deadline of the operation currently obtained postpone preset duration after
It is described that identical operation is executed from library；
When the master library when the error occurs, determining leads to the faulty operation of mistake；
Judge whether the faulty operation has executed described from library；
If the faulty operation is not yet executed described from library, using the data from library to the data of the master library
Restored；
It is described that the data of the master library are restored from the data in library described in, including：
It is described the faulty operation has been executed from library before operation；
The data of the master library are repaired using the data current from library, so that the data of the master library are restored to and hold
State before the row faulty operation.
2. according to the method described in claim 1, it is characterized in that, it is described obtain in chronological order it is completed on the master library
Operation, including：
Sequence reads the operation being documented in master library operation log.
3. according to the method described in claim 1, it is characterized in that, the deadline with the operation currently obtained be
After basis delay preset duration identical operation is executed from library described, including：
Obtain the current time from library；
Whether the difference of the deadline and the current time that judge the operation currently obtained are less than the preset duration；
If it is less than the preset duration, then return acquisition it is described from the current time in library the step of；
If it is greater than or equal to the preset duration, then identical operation is executed with the operation from library described.
4. according to the method described in claim 1, it is characterized in that, the method further includes：
It is modified to the preset duration according to the input of user.
5. a kind of database recovery device, which is characterized in that Database Systems of the described device for being formed by master library and from library,
Data described in when initial from library are identical as the data of the master library；Described device includes：
Master library operates acquisition module, for obtaining completed operation on the master library in chronological order, gets every time described
After operation, trigger from library async backup module；
From library async backup module, the deadline of the operation for currently being obtained using master library operation acquisition module is base
Plinth described executes identical operation after postponing preset duration from library；
Restore judgment module, for working as the master library when the error occurs, determines the faulty operation for leading to mistake, judge the mistake
Whether operation has executed described from library, if the faulty operation is not yet executed described from library, trigger data
Recovery module；
Data recovery module described is restored the data of the master library from the data in library for using；
The data recovery module includes：
Restore prepare submodule, for it is described the faulty operation has been executed from library before operation；
Data repair submodule, for use it is described the data of the master library are repaired from the current data in library so that institute
The data for stating master library are restored to state before executing the faulty operation.
6. device according to claim 5, which is characterized in that the master library operates acquisition module and includes：
Sequence reading submodule reads the operation being documented in master library operation log for sequence；
Backup triggering submodule triggers after getting the operation every time from library async backup module.
7. device according to claim 5, which is characterized in that described to include from library async backup module：
Time acquisition submodule, for obtaining the current time from library；
Time compares submodule, the difference of the deadline and the current time of the operation for judging to judge currently to obtain
Whether be less than the preset duration, if it is less than the preset duration, then triggered time acquisition submodule, if it is greater than or be equal to
The preset duration then executes with the operation identical operation described from library.
8. device according to claim 5, which is characterized in that described device further includes：
Duration modified module, for being modified to the preset duration according to the input of user.
9. a kind of database recovery device, which is characterized in that Database Systems of the described device for being formed by master library and from library,
Data described in when initial from library are identical as the data of the master library, and described device includes：
Processor；
Memory for storing processor-executable instruction；
Wherein, the processor is configured as：
Completed operation on the master library is obtained in chronological order；
After getting the operation every time, based on the deadline of the operation currently obtained postpone preset duration after
It is described that identical operation is executed from library；
When the master library when the error occurs, determining leads to the faulty operation of mistake；
Judge whether the faulty operation has executed described from library；
If the faulty operation is not yet executed described from library, using the data from library to the data of the master library
Restored；
It is described that the data of the master library are restored from the data in library described in, including：
It is described the faulty operation has been executed from library before operation；
The data of the master library are repaired using the data current from library, so that the data of the master library are restored to and hold
State before the row faulty operation.
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| CN106802895B (en) * | 2015-11-26 | 2020-06-02 | 阿里巴巴集团控股有限公司 | Method and device for repairing database backup data |
| CN105528264B (en) * | 2015-12-18 | 2018-08-21 | 福建随行软件有限公司 | Fool proof data reconstruction method and its system |
| CN110263095B (en) * | 2019-05-31 | 2021-10-01 | 众安在线财产保险股份有限公司 | Data backup and recovery method and device, computer equipment and storage medium |
| CN115454951B (en) * | 2022-10-18 | 2023-06-30 | 读书郎教育科技有限公司 | Teaching data sharing system |
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