CN102012947A - Method and system for online backup of database - Google Patents
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Abstract
The utility model provides a system for online backup of a database, comprising a database server, a storage array, a backup server and a tape library, wherein the database server is used for operating a database, and using a logic volume of the storage array to store the data of the database; an instruction for carrying out snapshot generation on the logic volume called by the database server is sent to the storage array according to a command for carrying out backup operation on the database from the backup server; the backup server is used for connecting to the database server, pausing input and output of the database on the database server to a storage system, and sending a command for carrying out database backup operation on the database server; mapping information is added to a snapshot volume generated by the storage array, the snapshot volume is loaded according to the mapping information, and the data of the snapshot volume is moved to the tape library; and the storage array is used for carrying out snapshot operation on the logic volume called by the database server according to the instruction from the backup server so as to generate the snapshot volume.
Description
Technical field
The present invention relates to technical field of computer data storage, relate in particular to a kind of method and system of database online backup.
Background technology
Traditional backup based on document copying needs the application program operation suspension usually, begins copies data then, the operation that waits copy to recover application program again after finishing, and this traditional backup mode does not meet the needs of the application that guarantees business continuance.Simultaneously, under the tradition backup mode, when backup data quantity is big, the copies data time is generally longer, thereby the backup window time also can be very long, will have a strong impact on the normal operation of operation system like this, therefore, in the operation system that needs move continuously, this traditional backup mode is infeasible.
Along with the raising of storage application demand, the user needs online mode to carry out data protection, and snapshot (Snapshot) is exactly one of effective ways of online memory device strick precaution loss of data, and more and more equipments all begins to support this function.
Storage networking industry association (snia) to the definition of snapshot is: about a complete usable copy of specific data set, this copy comprises the reflection of corresponding data at certain time point (time point of copy beginning).Snapshot can be a copy of its represented data, also can be a duplicate of data.
The effect of snapshot mainly is can carry out online data to recover, and can carry out timely data and recover when memory device generation application and trouble or file corruption, data is reverted to the state of snapshot generation time point.Another effect of snapshot is for the storage user provides another one data access passage, and when former data were carried out online application and handled, the user can visit snapshot data, can also utilize snapshot work such as to test.
The storage array snapshot functions can be made the moment snapshot to one or more logical volumes, just the complete copy of that source logical volume constantly.Utilize this function of storage array, can involve in capable snapshot to the database place and generate, thereby utilize the snapped volume that generates to carry out online backup, on-line testing etc.
It should be noted that it all is the operation of data block one-level that above-described snapshot generates, and can't guarantee other data consistency of application system level.Yet, in order to guarantee the data consistency of database backup file, need before be made snapshot, the database source book make upper layer application forbid the source logical volume is carried out the write operation of data block one-level, thereby can guarantee the consistance that impinges upon the seen Backup Data of upper layer application soon of generation.Therefore in the prior art, snapping technique also can't be applied to DB Backup.
In order to realize the online data backup, also have some other solutions, such as, utilize RMAN and backup software can realize the online backup of oracle database together.Utilize the Qsnap software of CommVault company or, can realize the online data backup based on the snapshot functions of the Volume Manager software of Veritas company.But these schemes all are based on application server, need take a large amount of CPU and the memory source of application server.Therefore also can cause certain influence to user's regular traffic.
Summary of the invention
The invention provides a kind of method and system of database online backup, snapping technique is applied in the DB Backup, application program of user can be moved continuously and not stop during backing up, and can not have any impact to operation system.
The system of a kind of database online backup that the embodiment of the invention proposes, this system comprises: database server, storage array, backup server and tape library;
Described database server is used for runtime database, uses the logical volume of storage array to preserve data of database; According to database being carried out the order of backup operation, send the indication of the logical volume that database server called being carried out the snapshot generation to storage array from backup server;
Described backup server is used to be connected to database server, suspends the input and output of the database on the database server, sends the order of carrying out the DB Backup operation to database server; The snapped volume that storage array is generated adds map information, loads described snapped volume according to this map information, and the data of described snapped volume are moved in the tape library;
Described storage array is used for according to the described indication from backup server the logical volume that database server called being carried out snapshot operation, generates snapped volume;
Described tape library is used to preserve the data from backup server.
Preferably, described backup server also is used for removing the snapped volume of loading after the data with snapped volume move to tape library, and deletes described map information.
Preferably, described database server comprises:
Application data base is used for runtime database, calls the logical volume of storage array and preserves data of database;
The backup agent module is used to receive the order of carrying out the DB Backup operation from backup server, described application data base is placed silent status, and send the indication that the logical volume that database server called is generated snapshot to storage array; After snapshot generates, wake described application data base up.
Preferably, described backup server comprises:
Backup module is used for calling indication to the transmission of Pre-backup script module, receives the snapped volume loaded data from storage array, and described data are moved in the tape library; After described data move and finish, call indication to the transmission of Post-backup script module;
The Pre-backup script module, be used for indication invoke script according to backup module, described script is used to be connected to database server, suspends the input and output of the database of database server, sends the order of carrying out the DB Backup operation to database server; Described script also is used for the invoke script api interface snapped volume that storage array generates is added map information;
The Post-backup script module is used for the indication invoke script according to backup module, and described script is used for the invoke script api interface and removes the snapped volume of loading from backup server, and deletes the map information of snapped volume;
The script api interface is used for according to the calling of Pre-backup script module, and the snapped volume that storage array is generated adds map information, and communicates by letter with storage array, with the data load of described snapped volume to backup server; Also be used for according to the calling of Post-backup script module, remove the snapped volume of loading, and communicate by letter the map information of deletion snapped volume with storage array from backup server.
Preferably, connect by the storage area network network between described database server, storage array, backup server and the tape library.
Preferably, described database is an oracle database.
The embodiment of the invention also proposes a kind of method of database online backup, comprises the steps:
A, runtime database call the logical volume of storage array and preserve data of database;
The input and output of B, time-out database are carried out snapshot operation to the logical volume of preserving data of database, generate snapped volume, and the input and output that recover described database;
C, the data of described snapped volume are saved in the tape library.
Preferably, described database is an oracle database.
Preferably, before the described step B, further comprise: control documents, service parameter file and the network parameter file of the database installation directory from database is copied on the logical volume of storage array.
As can be seen from the above technical solutions, the backup functionality of backup server is combined with the snapshot functions of storage array, made full use of the function of storage array snapshot, can carry out online backup to database fast.The present invention program can greatly reduce the internal memory of application server and taking of cpu resource in backup procedure, improve backup efficient, and the impact of application server can be ignored substantially.In addition, after database generation snapshot is finished, use the SAN network that Backup Data is moved to tape library, thereby avoided the data transmission of LAN (Local Area Network), can guarantee not increase the burden of data transmission in the LAN (Local Area Network).
Description of drawings
Fig. 1 is the hardware connection diagram of the database online backup system of embodiment of the invention proposition;
Fig. 2 is the basic flow sheet of database online backup of the present invention;
Fig. 3 is the process flow diagram of the oracle database online backup of embodiment of the invention proposition;
The database backup system block diagram that Fig. 4 proposes for the embodiment of the invention.
Embodiment
Below be example with the backup of oracle database, technical solution of the present invention is described in detail.
In order to realize operation to storage array, and to the operation of oracle database, the present invention program need realize the proxy module of a centre, the main work of proxy module is exactly the operation that source, database place logical volume is generated snapshot, and the associative operation of controlling database in the process that generates snapshot.
Wherein, proxy module need be operated the following file of database:
1, control documents: the information of preserving the descriptive data base physical arrangement with binary mode.
2, online redo log file: each database has two or more redo log file sets, and the major function of redo log is whole changes of record data, and the information in the redo log file just is used for recovering from system or medium collapse.
3, archive log file: the archive log file is that Oracle produces archive log under the archive mode, and archive log comprises the copy of each the generation group after Oracle enters archive mode.
4, table space data file: database is split into the logic storage unit that is called table space, relevant logical block grouping.
5, service parameter file: comprise initialization and server profile, in order to beginning and dispose a database instance.
6, network parameter file: comprise network and configuration file, password file etc.
The All Files of more than enumerating all is that the database recovery reconstruction is necessary, is referred to as metadata (metadata).Usually, control documents, service parameter file and network parameter file can be positioned at below the installation directory of oracle database, and often oracle database can be installed on this domain of main frame, and simultaneously, proxy module can only carry out snapshot operation to memory device.Therefore, in order successfully to realize the backup of oracle database, proxy module need at first copy these files to the logical volume of memory device correspondence, uses the snapshot functions of memory device that it is backed up then.For online redo log file, archive log file and table space data file, require them to deposit in above the logical volume of memory device, otherwise these files will can not backed up in backup procedure.Oracle database need run on filing (ARCHIVELOG) pattern, otherwise archive log just can not be generated, and then the recovery meeting of database is failed because lacking archive log.
Script application programe interface (ScriptAPI): be responsible for communicating by letter, the snapshot that generates is loaded on the backup server with storage array.
Fig. 1 is the hardware connection diagram of the database online backup system of embodiment of the invention proposition.Database server 101 and database server 102 are servers of wanting place, backed up data storehouse, and in the practical application, the number of database server can only have one, perhaps has a plurality of.Backup server 103, media server 104 and storage array 105 and database server 101 and database server 102 are connected by Ethernet, simultaneously, storage area network network (the SAN that each part mentioned above also supports by FC, StorageArea Network) connect, described SAN also connects tape library 106.
Fig. 2 shows the basic procedure of database online backup of the present invention, comprises the steps:
Step 201: runtime database, call the logical volume of storage array and preserve data of database;
Step 202: suspend the input and output of database, the logical volume of preserving data of database is carried out snapshot operation, generate snapped volume, and the input and output that recover described database;
Step 203: the data of described snapped volume are saved in the tape library.
The flow process of the oracle database online backup that the embodiment of the invention proposes comprises the steps: as shown in Figure 3
Step 301: backup server is connected to database server, obtains metadata (metadata).
The described process of obtaining metadata comprises: control documents, service parameter file and the network parameter file of the database installation directory from database is copied on the logical volume of storage array.
Step 302: the online non-temporary table of all of switch data storehouse space is to backup mode.
Step 303: file current online daily record.
Step 304: suspend the input and output (IO) of Database Systems, storage array generates the operation of snapshot to database, after finishing, and the IO of restore database system.
Step 305: backup mode is withdrawed from all online non-temporary table spaces of database.
Step 306: backup server and database server disconnect, and write Backup History.
The database backup system that the embodiment of the invention proposes as shown in Figure 4.This system comprises database server 401, storage array 402, backup server 403 and tape library 404.Wherein, database server 401 comprises: application data base 405 and backup agent module 406.Storage array 402 comprises: logical volume 407 and snapped volume 408.Backup server 403 comprises: script api interface 409, Pre-backup script module 410, Post-backup script module 411 and backup module 412.
Described database server 401 is used for runtime database, uses the logical volume 407 of storage array 402 to preserve data of database; According to carrying out the order of backup operation, send the logical volume 407 that database server 401 is called to storage array 402 and carry out the indication that snapshot generates from 403 pairs of databases of backup server;
Described backup server 403 is used to be connected to database server 401, suspends the input and output of the database on the database server 401, sends the order of carrying out the DB Backup operation to database server 401; The snapped volume that storage array 402 is generated adds map information, loads described snapped volume 408 according to this map information, and the data of described snapped volume 408 are moved in the tape library 404;
Described storage array 402 is used for according to the described indication from backup server 403, and the logical volume 407 that database server 401 is called carries out snapshot operation, generates snapped volume 408;
Described tape library 404 is used to preserve the data from backup server.
Described backup server 403 also is used for after the data with snapped volume 408 move to tape library 404, removes the snapped volume 408 of loading, and deletes described map information.
Described database server 401 comprises:
Described backup server 403 comprises:
The Post-backup script module, be used for calling the Post-backup script according to the indication of backup module, described Post-backup script is used for invoke script api interface 409 and removes the snapped volume 408 of loading from backup server 403, and deletes the map information of snapped volume 408;
Data stream I flows to from logical volume 407 to database server 401, and the effect of this data stream is that logical volume 407 is loaded on the database server 401 as source book, in order to the data in storing applied data storehouse 405.The flow direction of data stream II is for to be mapped to backup server 403 from snapped volume 408, in order to the source book as the copy Backup Data.Data stream III is that Backup Data is moved to tape library 404 from backup module 412.
Being described as follows of control stream:
1.: backup module 412 called pre-backup script module 410 before backing up.
2. extremely 3.: pre-backup script module 410 is called backup agent module 406, order backup agent module 406 places silent status (promptly suspending the IO of database server 401) with application data base 405,405 places, application data storehouse are involved in capable snapshot and are generated, and wake database then up.3. represent backup agent module 406 with application data base 405 and storage array 402 communicating by letter in said process.Described snapshot generates exactly the logical volume 407 of preserving database data is carried out snapshot operation, generates snapped volume 408.
4.: the snapshot of 409 pairs of generations of Pre-backup script module 410 invoke script api interfaces adds map information.
5.: script api interface 409 is communicated by letter with storage array 402, with the data load of the snapped volume 408 that generates to backup server 402.
6.: backup module 412 moves to data in the tape library 404 from snapped volume 408.
7.: after backup was finished, the script that backup module 412 calls in the post-backup script module 411 backed up aftertreatment.
8.: post-backup script module 411 invoke script api interfaces 409 remove the snapped volume of loading from backup server 403.
9.: script api interface 409 is communicated by letter with storage array 402, the map information of deletion snapped volume 408.
Technical solution of the present invention has following beneficial effect:
The present invention program can realize zero backup window, that is to say that application program of user can continue operation during backing up, and can not have any impact to operation system.
In traditional backup based on document copying, Backup Data need copy on the media server from application server through LAN (Local Area Network) usually, is saved in the tape then.Because backup data quantity is generally all very big, during backing up, can take a large amount of LAN bandwidth, user's regular traffic is used the influence that causes to a certain degree.The present invention program can realize Backup Data without LAN (Local Area Network), but directly moves to the tape-shaped medium's by optical-fibre channel from snapped volume.Avoided the regular traffic on user's the LAN (Local Area Network) is brought influence.
This programme can directly be loaded into the snapshot dish on the backup server or on the media server, with moving on the backup medium of Backup Data is being CPU and the memory source that does not just need to take on the application server like this.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. the system of a database online backup is characterized in that, this system comprises: database server, storage array, backup server and tape library;
Described database server is used for runtime database, uses the logical volume of storage array to preserve data of database; According to database being carried out the order of backup operation, send the indication of the logical volume that database server called being carried out the snapshot generation to storage array from backup server;
Described backup server is used to be connected to database server, suspends the input and output of the database on the database server, sends the order of carrying out the DB Backup operation to database server; The snapped volume that storage array is generated adds map information, loads described snapped volume according to this map information, and the data of described snapped volume are moved in the tape library;
Described storage array is used for according to the described indication from backup server the logical volume that database server called being carried out snapshot operation, generates snapped volume;
Described tape library is used to preserve the data from backup server.
2. system according to claim 1 is characterized in that, described backup server also is used for removing the snapped volume of loading after the data with snapped volume move to tape library, and deletes described map information.
3. system according to claim 1 is characterized in that, described database server comprises:
Application data base is used for runtime database, calls the logical volume of storage array and preserves data of database;
The backup agent module is used to receive the order of carrying out the DB Backup operation from backup server, described application data base is placed silent status, and send the indication that the logical volume that database server called is generated snapshot to storage array; After snapshot generates, wake described application data base up.
4. system according to claim 1 is characterized in that, described backup server comprises:
Backup module is used for calling indication to the transmission of Pre-backup script module, receives the snapped volume loaded data from storage array, and described data are moved in the tape library; After described data move and finish, call indication to the transmission of Post-backup script module;
The Pre-backup script module, be used for calling the Pre-backup script according to the indication of backup module, described Pre-backup script is used to be connected to database server, suspend the input and output of the database of database server, send the order of carrying out the DB Backup operation to database server; Described script also is used for the invoke script api interface snapped volume that storage array generates is added map information;
The Post-backup script module is used for calling the Post-backup script according to the indication of backup module, and described Post-backup script is used for the invoke script api interface and removes the snapped volume of loading from backup server, and deletes the map information of snapped volume;
The script api interface is used for according to the calling of Pre-backup script module, and the snapped volume that storage array is generated adds map information, and communicates by letter with storage array, with the data load of described snapped volume to backup server; Also be used for according to the calling of Post-backup script module, remove the snapped volume of loading, and communicate by letter the map information of deletion snapped volume with storage array from backup server.
5. system according to claim 1 is characterized in that, connects by the storage area network network between described database server, storage array, backup server and the tape library.
6. according to each described system of claim 1 to 5, it is characterized in that described database is an oracle database.
7. the method for a database online backup is characterized in that, comprises the steps:
A, runtime database call the logical volume of storage array and preserve data of database;
The input and output of B, time-out database are carried out snapshot operation to the logical volume of preserving data of database, generate snapped volume, and the input and output that recover described database;
C, the data of described snapped volume are saved in the tape library.
8. method according to claim 7 is characterized in that, described database is an oracle database.
9. method according to claim 8 is characterized in that, before the described step B, further comprises: control documents, service parameter file and the network parameter file of the database installation directory from database is copied on the logical volume of storage array.
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