CN105320576A - Device and method for database backup - Google Patents
Device and method for database backup Download PDFInfo
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- CN105320576A CN105320576A CN201410234997.7A CN201410234997A CN105320576A CN 105320576 A CN105320576 A CN 105320576A CN 201410234997 A CN201410234997 A CN 201410234997A CN 105320576 A CN105320576 A CN 105320576A
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Abstract
The invention relates to a device and method for database backup. The device comprises a data backup unit, a data physical read-write unit and a trigger arranged in an assigned data table in a database, wherein the trigger is used for triggering the data backup unit to perform backup on the assigned data table when responding to insertion, deletion or modification operation of data in the assigned data table in the database. The data backup unit is used for receiving triggering information sent by the trigger, and calling the data physical read-write unit according to the triggering information to perform actual read-write backup operation on the assigned data table. The data physical read-write unit is used for performing backup of the assigned data table into a backup area according to the triggering information. According to the device and method for database backup, assigned important data tables in the database can undergo real-time backup, and the system burden is hardly increased.
Description
Technical field
The disclosure relates to database, especially, relates to a kind of DB Backup apparatus and method.
Background technology
Existing database backup method has 3 kinds: full backup, incremental backup and differential backup.These backup methods are all back up according to the more new state of data instead of significance level, and the data that significance level is not identical back up according to identical strategy without exception.And the significant data of a lot of application system is very responsive, preferably can back up in realtime.Such as, but because standby system all can only carry out identical backup to all data, back up in realtime, this causes system loading and stores sharply increasing, and does not have good feasibility in practice.
Summary of the invention
The disclosure proposes new technical scheme in view of at least one in above problem.
The disclosure provides a kind of DB Backup device in one, and it can be backed up in realtime to the significant data table of specifying in database, and increases system burden hardly.
The disclosure provides a kind of database backup method on the other hand at it, and it can be backed up in realtime to the significant data table of specifying in database, and increases system burden hardly.
According to the disclosure, provide a kind of DB Backup device, the trigger comprising data backup unit, Data Physical read-write cell and be arranged in database in specific data table, wherein,
Trigger, in response to when inserting the data in specific data table in database, delete or change operation, trigger data backup units backs up specific data table;
Data backup unit, for receiving the trigger message that trigger sends, carries out actual read-write backup operation according to trigger message calling data physical read r/w cell to specific data table;
Data Physical read-write cell, for backuping to specific data table in backup area according to trigger message.
In embodiments more of the present disclosure, this device also comprises:
Data recovery unit, in response to the request to date restoring, calling data physical read r/w cell writes data in corresponding tables of data from specifying backup area;
Data Physical read-write cell is also written to specifying the data of backup area in corresponding tables of data for the instruction according to data recovery unit.
In embodiments more of the present disclosure, backup area is file system, another database instance or specific data table another tables of data in a database.
In embodiments more of the present disclosure, Data Physical read-write cell backs up specific data table by full backup mode.
In embodiments more of the present disclosure, trigger message comprises operational order and by the tables of data operated.
In embodiments more of the present disclosure, trigger message also comprises the position that specific data table will be backed up to.
According to the disclosure, additionally provide a kind of database backup method, comprising:
In response to when inserting the data in specific data table in database, delete or change operation, the trigger trigger data backup units be arranged in specific data table backs up specific data table;
The trigger message calling data physical read r/w cell that data backup unit sends according to trigger carries out actual read-write backup operation to specific data table;
Specific data table backups in backup area according to trigger message by Data Physical read-write cell.
In embodiments more of the present disclosure, the method also comprises:
In response to the request to date restoring, data recovery unit calling data physical read r/w cell writes data in corresponding tables of data from specifying backup area.
In embodiments more of the present disclosure, backup area is file system, another database instance or specific data table another tables of data in a database.
In embodiments more of the present disclosure, Data Physical read-write cell backs up specific data table by full backup mode.
In embodiments more of the present disclosure, trigger message comprises operational order and by the tables of data operated.
In embodiments more of the present disclosure, trigger message also comprises the position that specific data table will be backed up to.
Compared with all adopting identical backup mode with all data of database in prior art, when the technical scheme of the present disclosure tables of data that user specifies in a database changes, triggered by the trigger be arranged in specific data table in real time and this specific data table is backed up in realtime, not only ensure that the security of data in these specific data tables, and the tables of data of to specify due to user is very important tables of data, its accounting in a database is smaller, therefore under the prerequisite of assuring data security, also increases system burden and storage space hardly.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the disclosure, forms a application's part.In the accompanying drawings:
Fig. 1 is the structural representation of the DB Backup device of a disclosure embodiment.
Fig. 2 is the structural representation of the DB Backup device of another embodiment of the disclosure.
Fig. 3 is the schematic flow sheet of the database backup method of a disclosure embodiment.
Fig. 4 is the schematic flow sheet carrying out a pretreated example before disclosure performing database backup method.
Fig. 5 is the schematic diagram of the disclosure to the database backup method of important data real time backup example.
Embodiment
Below with reference to accompanying drawings the disclosure is described.It should be noted that following being described in is only explanatory and exemplary in essence, never as any restriction to the disclosure and application or use.Unless stated otherwise, otherwise positioned opposite and numerical expression and the numerical value of the parts of setting forth in an embodiment and step do not limit the scope of the present disclosure.In addition, technology well known by persons skilled in the art, method and apparatus may not be discussed in detail, but are intended to the part becoming instructions in appropriate circumstances.
Inventor finds, in database, also the data of not all have status of equal importance, carry out backing up in realtime serious waste system resource for those unessential data.Therefore, the tables of data in database can be divided into important tables of data and the tables of data of insignificant by user according to demand, and only to tables of data important in database, that is, specific data table is backed up in realtime.
Thisly only important data to be backed up in realtime, and to those unessential data still strategy conveniently and method back up, both ensure that significant data has enough safety, increased system burden and storage space hardly again.
Fig. 1 is the structural representation of the DB Backup device of a disclosure embodiment.
As shown in Figure 1, the trigger 106 that the device 10 in this embodiment can comprise data backup unit 102, Data Physical read-write cell 104 and be arranged in database in specific data table.
It is pointed out that in order to the data in each specific data table carry out backing up in realtime of data once changing, the disclosure carries out at each needs all pre-setting trigger 106 in the specific data table of backing up in realtime.
Trigger 106, in response to when inserting the data in specific data table in database, delete or change operation, trigger data backup units backs up specific data table;
Data backup unit 102, for receiving the trigger message that trigger sends, carries out actual read-write backup operation according to trigger message calling data physical read r/w cell to specific data table;
Data Physical read-write cell 104, for backuping to specific data table in backup area according to trigger message.
Compared with all adopting identical backup mode with all data of database in prior art, when this embodiment tables of data that user specifies in a database changes, triggered by the trigger be arranged in specific data table in real time and this specific data table is backed up in realtime, not only ensure that the security of data in these specific data tables, and the tables of data of to specify due to user is very important tables of data, its accounting in a database is smaller, therefore under the prerequisite of assuring data security, also increases system burden and storage space hardly.
Further, DB Backup device can also comprise:
Data recovery unit, in response to the request to date restoring, calling data physical read r/w cell writes data in corresponding tables of data from specifying backup area;
Data Physical read-write cell is also written to specifying the data of backup area in corresponding tables of data for the instruction according to data recovery unit.
Further, backup area can for file system, another database instance or specific data table another tables of data in a database.
It is pointed out that Data Physical read-write cell can be backed up the specified database in database by modes such as full backup, incremental backup or differential backups.
Wherein, the meaning that incremental backup and differential backup exist is, they more save storage space than full backup, particularly those is infrequently changed to the table of data.With regard to resume speed, when the fastest when full backup mode is recovered, incremental backup recovers the slowest (but incremental backup is also save storage space most).For the tables of data of frequent change, because nearly all data are all variant, so significantly storage space can not be saved to these data acquisition differential backups and incremental backup, greatly resume speed can be reduced on the contrary.
Further, for the frequent significant data changed, Data Physical read-write cell can back up specific data table by full backup mode.
In addition, the trigger message that data backup unit issued by trigger can include but not limited to operational order and by the tables of data operated.
Wherein, operational order can comprise increase, amendment or delete data.
Further, trigger message can also comprise the position that specific data table will be backed up to.Such as, if the tables of data of multiple backup can be comprised in backup area, then can comprise in operational order and this specific data table is backuped to position, that is, the start offset position of specific data table in backup area.
It is pointed out that above-mentioned specific data table is the tables of data containing significant data that user selects in database.
Fig. 2 is the structural representation of the DB Backup device of another embodiment of the disclosure.
As shown in Figure 2, the device 20 in this embodiment can comprise data backup unit 102, Data Physical read-write cell 104, data recovery unit 202 and trigger 106.Wherein,
Trigger 106, on the upper strata of data backup unit 102, is distributed in the significant data table needing backup, for inserting when significant data, deleting, retouching operation time, the data backup unit 102 calling its lower floor is to implement to back up;
Data backup unit 102, be positioned at the upper strata of the lower floor of trigger 106, Data Physical read-write cell 104, for receiving the trigger message that trigger 106 sends, after receiving trigger message, read the data needing backup, then the Data Physical read-write cell 104 calling its lower floor writes data into backup area;
Further, when carrying out the backup of specific data table, also comprising and writing BACKUP TIME in the backup area, for controlling the version that will recover when date restoring;
Data recovery unit 202, is positioned at the upper strata of Data Physical read-write cell 104, and for when needs recover data, the Data Physical read-write cell 104 calling its lower floor reads data from backup area, and is written in corresponding tables of data;
Further, when carrying out date restoring, can according to present system time and data backup time, the version recovered by artificial selection, or automatically restore to appropriate version according to system time, but be return to recent release in most cases;
Data Physical read-write cell 104, is positioned at the lower floor of data backup unit 102, data recovery unit 202, is the bottom of whole system, for completing the actual read-write of data, and the details of shielding backup area reading and writing data;
Further, backup area can be the other tables of data of file system, another database instance, same data instance, the concrete read-write mode of different backup areas is different, for ensureing the brief, efficient of backup script, specifically completing of read-write is placed on Data Physical read-write cell 104, the execution details of the concrete read-write of, shielding transparent to upper strata.
DB Backup device shown in Fig. 2 selects the important table needing to back up in realtime in a database; Select the table relevant with above-mentioned table, these tables are referred to as important tables of data; In these tables, Insert, Delete, Update trigger is set; Data backup script is write in trigger script; When important tables of data insert, delete, retouching operation time, trigger above-mentioned trigger, trigger performs backup script and backs up data; For ensureing execution efficiency and the reliability of backup script, backup script should be as far as possible short, and Data Physical read-write script is put in the bottom write of data; When recovering, date restoring script calling data physics read-write script, reads data from backup area, is written in corresponding tables of data.
One of ordinary skill in the art will appreciate that, realize the whole of said method embodiment to have been come by the hardware that programmed instruction is relevant with part steps, aforesaid program can be stored in a computing equipment read/write memory medium, this program is when performing, perform and comprise the step of said method embodiment, and aforesaid storage medium can comprise ROM, RAM, magnetic disc and CD etc. various can be program code stored medium.
Fig. 3 is the schematic flow sheet of the database backup method of a disclosure embodiment.
As shown in Figure 3, this embodiment can comprise the following steps:
S302, in response to when inserting the data in specific data table in database, delete or change operation, the trigger trigger data backup units be arranged in specific data table backs up specific data table;
S304, the trigger message calling data physical read r/w cell that data backup unit sends according to trigger carries out actual read-write backup operation to specific data table;
S306, specific data table backups in backup area according to trigger message by Data Physical read-write cell.
Compared with all adopting identical backup mode with all data of database in prior art, when this embodiment tables of data that user specifies in a database changes, triggered by the trigger be arranged in specific data table in real time and this specific data table is backed up in realtime, not only ensure that the security of data in these specific data tables, and the tables of data of to specify due to user is very important tables of data, its accounting in a database is smaller, therefore under the prerequisite of assuring data security, also increases system burden and storage space hardly.
Further, after step S306, the method can also comprise the following steps:
In response to the request to date restoring, data recovery unit calling data physical read r/w cell writes data in corresponding tables of data from specifying backup area.
Wherein, backup area can for file system, another database instance or specific data table another tables of data in a database.
It is pointed out that Data Physical read-write cell can be backed up the specified database in database by modes such as full backup, incremental backup or differential backups.
Further, Data Physical read-write cell can back up specific data table by full backup mode.
In addition, the trigger message sent by trigger can include but not limited to operational order and by the tables of data operated.
Further, trigger message can also comprise the position that specific data table will be backed up to.
Fig. 4 is the schematic flow sheet carrying out a pretreated example before disclosure performing database backup method.
As shown in Figure 4, this embodiment can comprise the following steps:
S402, select the tables of data needing to back up in realtime, the quantity of table can not be selected too much, otherwise the performance of meeting influential system.
Particularly, also the tables of data of backing up in realtime can be needed according to setting rules selection by artificial selection.Data base administrator can select according to the performance of the actual conditions of application and system, ensures that significant data can be backed up on the one hand, ensures on the other hand not increase the burden of system, the normal operation of non-EVAC (Evacuation Network Computer Model).Certainly, along with the change of application and the raising of system performance, keeper according to circumstances can adjust the data of carrying out backing up in realtime.
S404, finds the table that the table of backing up in realtime with above-mentioned needs is relevant, and data of these tables must be consistent with the data of above-mentioned table, and this 2 class table is referred to as important tables of data, that is, specific data table.
Particularly, the table relevant with the table needing to back up in realtime can be gone for according to the dependence of data.Because data are associated, only back up most important data separately, the inconsistent of significant data and associated data may be caused, as securities exchange system, the stock quantity of the transaction if only backed up in realtime, and do not back up the price of transaction, then when data corruption, stock quantity can only be recovered, can not find corresponding price.Which table concrete is associated, keeper oneself is needed to analyze, can determine according to the patient burden of practical situations and system institute, also all tables of data that important table relies on all might not be chosen and back up in realtime, as although tran list also relies on investor's table, but investor shows substantial amounts and change is little, and the probability of loss is also very low, do not need to back up in realtime so investor shows to wait.
S406, significant data table is set up Insert, Delete, Update trigger.
S408, in trigger, embedding data backup units is called, and for ensureing reliability and execution efficiency, trigger statement is short, few, and concrete operations are put in other unit.
S410, sets up data backup/recovery unit, and data backup unit reads data from table, and calling data physical read r/w cell, is written to backup area; Data recovery unit, from backup area sense data, is written in corresponding table.
S412, sets up Data Physical read-write cell.
Fig. 5 is the schematic diagram of the disclosure to the database backup method of important data real time backup example.
As shown in Figure 5, this embodiment can comprise the following steps:
S502, inserts in important tables of data, deletes, when changing operation, trigger flip-flops, trigger calling data backup units, backs up in realtime to data.
S504, after trigger is triggered, calling data backup units, backs up in realtime to the data in important tables of data.
S506, data backup unit reads data from important tables of data, and reads the time from system, stamps timestamp, calling data physical read r/w cell to data.
S508, Data Physical read-write cell writes data into backup area.
In this instructions, each embodiment all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, and part identical with similar between each embodiment can cross-reference.For device embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part can see the explanation of embodiment of the method part.
Although describe the disclosure with reference to exemplary embodiment, should be understood that the disclosure is not limited to above-mentioned exemplary embodiment.It will be obvious to those skilled in the art that and can revise above-mentioned exemplary embodiment under the condition not deviating from the scope of the present disclosure and spirit.The scope of appended claim should be endowed the widest explanation, to comprise all such amendments and equivalent 26S Proteasome Structure and Function.
Claims (12)
1. a DB Backup device, is characterized in that, the trigger comprising data backup unit, Data Physical read-write cell and be arranged in database in specific data table, wherein,
Described trigger, in response to when inserting the data in specific data table in described database, delete or change operation, triggers described data backup unit and backs up described specific data table;
Data backup unit, for receiving the trigger message that described trigger sends, calling described Data Physical read-write cell according to described trigger message and carrying out actual read-write backup operation to described specific data table;
Data Physical read-write cell, for backuping to described specific data table in backup area according to described trigger message.
2. DB Backup device according to claim 1, is characterized in that, described device also comprises:
Data recovery unit, in response to the request to date restoring, calls described Data Physical read-write cell and writes data in corresponding tables of data from specifying backup area;
Described Data Physical read-write cell is also written to specifying the data of backup area in corresponding tables of data for the instruction according to data recovery unit.
3. DB Backup device according to claim 1, is characterized in that, described backup area is file system, another database instance or specific data table another tables of data in a database.
4. DB Backup device according to claim 1, is characterized in that, described Data Physical read-write cell backs up described specific data table by full backup mode.
5. DB Backup device according to claim 1, is characterized in that, described trigger message comprises operational order and by the tables of data operated.
6. DB Backup device according to claim 5, is characterized in that, described trigger message also comprises the position that described specific data table will be backed up to.
7. a database backup method, is characterized in that, comprising:
In response to when inserting the data in specific data table in database, delete or change operation, the trigger trigger data backup units be arranged in specific data table backs up described specific data table;
The trigger message calling data physical read r/w cell that described data backup unit sends according to described trigger carries out actual read-write backup operation to described specific data table;
Described specific data table backups in backup area according to described trigger message by described Data Physical read-write cell.
8. database backup method according to claim 7, is characterized in that, described method also comprises:
In response to the request to date restoring, data recovery unit is called described Data Physical read-write cell and is write data in corresponding tables of data from specifying backup area.
9. database backup method according to claim 7, is characterized in that, described backup area is file system, another database instance or specific data table another tables of data in a database.
10. database backup method according to claim 7, is characterized in that, described Data Physical read-write cell backs up described specific data table by full backup mode.
11. database backup method according to claim 7, is characterized in that, described trigger message comprises operational order and by the tables of data operated.
12. database backup method according to claim 11, is characterized in that, described trigger message also comprises the position that described specific data table will be backed up to.
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| CN109782609A (en) * | 2017-11-13 | 2019-05-21 | 广东工业大学 | A kind of intelligent home control system |
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| CN109815233A (en) * | 2018-12-27 | 2019-05-28 | 北京奇艺世纪科技有限公司 | A kind of processing method and system of tables of data |
| CN112612775A (en) * | 2020-12-17 | 2021-04-06 | 平安消费金融有限公司 | Data storage method and device, computer equipment and storage medium |
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| CN113568779A (en) * | 2021-06-25 | 2021-10-29 | 杭州雅观科技有限公司 | Community data backup system based on routing equipment |
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