CN1731364A - Method for compression and search of database backup data - Google Patents
Method for compression and search of database backup data Download PDFInfo
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- CN1731364A CN1731364A CN 200510089161 CN200510089161A CN1731364A CN 1731364 A CN1731364 A CN 1731364A CN 200510089161 CN200510089161 CN 200510089161 CN 200510089161 A CN200510089161 A CN 200510089161A CN 1731364 A CN1731364 A CN 1731364A
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Abstract
The invention provides a novel compress mode for data base's data backup, wherein the compression ratio of the structured data in data base can be increased to 10-30 times from 2-3 times, thus substantially decreasing the storage capacity and transmission flow of the backup data, the invention also provides a simplified method for the query of backup data, which requires no data base recovery operation.
Description
Technical field
Technical field of the present invention belongs to the DB Backup technology.
Background technology
The mass data of database online query generally all needs schedule backup.The data of database backup generally has two purposes: the one, for the security consideration of Database Systems, when Database Systems break down, recover with Backup Data; The 2nd, the time is inquired about the very little data of frequency for a long time, file storage, so that still can retrieve when needing.
To the compression of database back-up data, generally by backup storage device for example the compression chip on the magnetic tape station handle.The memory size of compression chip is generally less, XKB for example, carrying out backed up data also compresses by the corresponding data block size, and the compression of data block, be regardless of data type (text, image, or packed data etc. not), adopt without exception with a kind of compressed encoding, for example LZ compressed encoding etc.
When backup storage device self does not provide the chip compression, present backup software also can provide the software compression, but the mode of compression is also similar with the chip compression, is also undertaken by less data block, and also do not distinguish data type, adopt with a kind of compressed encoding without exception.
Existing data backup system, no matter above-mentioned chip compress mode or software compress mode, all has only very low compressibility, usually doubly less than 2-3, and,, carry out the compression of LZ and so on again as jpeg picture etc. to the data of having compressed, do not have any compression effectiveness yet, can take the compression processing time by whitecap.
Except above-mentioned data compression problem, to the retrieval of Backup Data, also lack simple, fast means at present.To the retrieval of Backup Data, existing mode is at first it to be returned in the corresponding service database of online query, is deleted from the associated databases of online query after the inquiry again.The above-mentioned course of work needs database server to carry out a series of operation, and is both very loaded down with trivial details time-consuming, increases the probability of makeing mistakes again easily.
Purpose of the present invention provides the efficient compression and the real-time search method of database back-up data, exactly to improve the above-mentioned defective of present DB Backup technology greatly.
Summary of the invention
Main contents of the present invention comprise two parts:
1, to the Backup Data of database, do not adopt the small data piece compress mode in the present data backup system, and serve as the compression process object with the data file that database is derived, and to the data of different types file, automatically adopt different compress techniques, thereby can greatly improve the compressibility of Backup Data, significantly reduce the memory capacity and the delivery flow rate of Backup Data.
2, to the retrieval of the Backup Data of database filing storage, the database recovery operation of not wasting time and energy, but directly backed up data file is retrieved, or create the volatile data base table and retrieve, thereby can greatly improve the search efficiency of database back-up data.
Description of drawings
Fig. 1 is a system logic structure synoptic diagram of the present invention;
Fig. 2 is the schematic flow sheet of database back-up data compress mode of the present invention;
Fig. 3 is the schematic flow sheet of database back-up data search method of the present invention;
Fig. 4 is the schematic flow sheet of the another kind of search method of database back-up data of the present invention.
Embodiment
System logic structure synoptic diagram of the present invention, as shown in Figure 1.Backup file server among the figure is mainly used in storage and inquiry backed up data file.Press the search method of the compression method and the database filing Backup Data of database back-up data below, be specifically described respectively.
First: the compression method of database back-up data:
The database of database server governs logically is made up of table space.When the data of database backup is the data file of file service management, the invention provides database back-up data compression method as described below.
1, the data with database table form two class data files.
To draw up the data of the database table of part by backup software, together with its structural information (field name, field length, field data types and constraint condition etc.), export to a buffer zone with direct-connected compression/de-compression server of database server or database server, form corresponding data file.The data of a tables of data can form one or several data file.
Data in the database table comprise two classes usually: the one, and the structured field data, as the character type field data, numeric type field data, time type field data etc.; Another kind of is the destructuring large object data, promptly usually said LOB, and as pictorial data, video data, spatial data, big text data etc.
When comprising destructuring large object data LOB in the database table, what deposit in this field is not large object data itself, but the address information of large object data.This address information can be specific table space address, also can be the external file address.
When the data of tables of data exported as data file, its structured field information comprised the address information in the LOB field, together with the structural information of this database table, formed a structured data file; Its large object data forms another one unstructured data file,
When a database table did not have large object data LOB, this database table just only formed a structured data file; Otherwise in a database table, when comprising a more than LOB field, then each large object data forms an independent lob data file.
2, to established two class data files, adopt different compress techniques respectively.
To established structured data file, can adopt a kind of general lossless compression-encoding to compress.For the unstructured data file, then according to different situations, for example be text, be image file, or composite file, be compressed file, or compressed file or the like not, adopt different compress modes respectively.
Automatically carried out by system for ease of squeeze operation, for set Database Systems, the information type of its LOB is normally known, can be to each LOB, and default compress mode code, shown in following inventory:
| The LOB file | AAA | BBB | CCC | DDD | EEE | NNN | |
| The compress mode code | 05 | 01 | 00 | 03 | 00 | 09 |
Each compress mode code in the inventory, corresponding corresponding compress mode is called corresponding condensing routine.For example 00 representative is not compressed, and 01 represents the LZ compression, and 02 represents the JPEG compression, and 09 representative is adopted different compress mode etc. respectively to the different information objects in the composite file.The schematic flow sheet of above-mentioned compress mode, as shown in Figure 2.
When data file was inconvenient to compress too greatly, also it can be divided into suitable data block capacity (for example XMB) compressed, the data file after the synthetic again compression.
3, generate the title table of comparisons of database table and its backup file.
Data file after the compression is sent the backup file server stores by common backup software.Recover when breaking down, or be convenient to the database data of filing is retrieved again, the table of comparisons of database table and its backup data files can be left in database server and the backup server simultaneously for ease of system.
Second portion: to the search method of database archival back-up data.
Backup Data to the database filing storage the invention provides two kinds of search methods: the one, directly the data file of filing storage is carried out search operaqtion; Another is based on Database Systems and retrieves.Now be respectively described below:
One, directly the data file of filing storage is carried out search operaqtion
1, determines to answer the data retrieved file
For this reason, application program provides and the same or analogous search interface of online data library searching for the user.When the user imports search condition at Application Program Interface, but the just database table title that will use of deterministic retrieval of application program.Because the application program of database is when using the SQL query statement, From statement wherein is to specify to inquire about from which database table.
After this, according to the title table of comparisons of database table and its backup data files, (this table of comparisons can read from backup file server or database server) just can be found and answer the data retrieved file.
2, carry out the preceding associative operation of document retrieval
Search method provided by the present invention both can be used for retrieving the formed archival back-up data file of the present invention, also can be used for retrieving the formed archival back-up data file of non-the present invention.Therefore, carrying out for the 3rd step " carrying out the search operaqtion of data file " before, need carry out following associative operation:
(1) determines whether this data file will carry out decompression
According to the filing data file name that finds previously, the backup file server reads in its buffer zone to corresponding data file.If the file that is read in is handled through overcompression, then " backup file server " request " compression/de-compression server " is carried out decompression to the information of being read in.
(2) determine whether comprise database table structure information in this data file
Non-compression filing data in the backup file server parses core buffer.If have database table structure information in the filing data, then system obtains database table structure information from buffer zone; If do not have database table structure information in the Backup Data, the pairing database table title of this backup data files of system searching is then obtained the structural information of this database table again from " database server ".
3, carry out the search operaqtion of data file
According to the search condition that database table structure information and user import on the user interface that application program provides, the backup file server just can directly carry out search operaqtion to structurized data file.
For example, the search condition that the structural information of certain database table and user import on application program user interface, in the following example shown in:
| Storehouse list structure information | Name | Sex | Date of birth | Schooling | Technology specialty | The work post |
| Search condition | In June, 〉=1975 | Master or doctor | Computing machine |
According to storehouse list structure information, application program just can compare operation with the data recording of above-mentioned search condition and this data file.This compare operation, can be undertaken by following any mode:
A kind of mode is that the respective field with each bar data recording of whole search conditions and data file compares one by one, will satisfy the data recording of whole search conditions simultaneously, charges to the result for retrieval file.For example, in the example, the respective field of three search conditions to each bar data recording of data file compared one by one in the above, three data recording that search condition satisfies are simultaneously just charged in the destination file.
Another kind of mode is that by each search condition of user's input, the respective field to the data record compares operation successively.Compare by the field of first search condition (for example going up " date of birth " in the example) earlier, qualified data recording is charged to first temporary file with every data recording of data file; And then, carry out the compare operation of second search condition (for example going up " schooling " in the example) to each bar data recording of first temporary file, form second temporary file again; And the like, N temporary file of N (last) search condition formation, as the result for retrieval file.
The third mode is that when backup data files had index and ordering, the compare operation in the then above-mentioned dual mode was only carried out in the data recording scope that limits.Mobile phone charge record inventory for example normally is the master index key with the phone number.The phone number of China Mobile is divided into " Global Link ", and " walk in the Divine Land " and " M-ZONE " etc., Global Link divides 137,138,139 or the like again.The telephone expenses record of the mobile phone that number is 137xxxxxxxx obviously only needs to inquire about in the index area is 137 recording interval.
To top giving an example, no matter which kind of retrieval mode obviously can draw identical result for retrieval, example is as follows:
| Name | Sex | Date of birth | Schooling | Technology specialty | The work post |
| Open xx | The man | In November, 1980 | The master | Computing machine | Xxx |
| King x | The man | In February, 1976 | Doctor | Computing machine | Xxx |
| Ouyang xx | The woman | In July, 1981 | The master | Computing machine | Xxx |
When search condition relates to a more than data file, obviously can carry out in a manner described successively different data files.The schematic flow sheet of above-mentioned search method to database archival back-up data, as shown in Figure 3.
Two, based on the search operaqtion of Database Systems
For the Backup Data of filing storage, also can retrieve based on Database Systems.
This moment system preceding two operation stepss, with preceding two operation stepss of aforementioned " directly the data file of filing storage being carried out search operaqtion " (1, determine to answer the data retrieved file; 2, carry out the preceding associative operation of document retrieval), be duplicate.Its difference only is the database retrieval operation of carrying out as described below.
When carrying out the database retrieval operation, application program is not with the data in the backup data files, again import in the original database table, and in database server, open up independent table space, create interim database table, and according to its database table structure information, in the new volatile data base table of creating of the backup file data importing in the backup file server buffers district.
After this,, just can continue to use original online retrieving application program and carry out, only need the database table that retrieval is original, become the volatile data base table of retrieving novel the retrieval of Backup Data.After search complete, application program was again with this volatile data base list deletion.
Above-mentioned volatile data base table also can be created in (the non-database server that is used for online retrieving) in the independent database server, and this database server still uses the data base management system (DBMS) the same with original online database server.
The schematic flow sheet of above-mentioned another kind of search method to database filing data, as shown in Figure 4.
Explanation for alleviating the load of backup server, to the search operaqtion of data file, also can be carried out on client computer in passing; The data retrieved file is too big when intending, and also can it be read in the core buffer of backup server or client computer in batches.
Important value of the present invention mainly comprises following several aspect:
1, the present invention can greatly improve the compressibility of Backup Data, generally can with the compressibility of database structure data by present less than 2-3 doubly, bring up to 10-30 doubly.This not only can save the equipment investment of back-up storage greatly, and can significantly reduce the data traffic in the transmission channel.Thus, also available under many circumstances LAN IP channel replaces fiber channel, with scsi interface equipment, replaces fibre-optic interface device, thereby reduces the cost of total system greatly.
2, because the very big raising of data compression rate, also be very beneficial for the height redundancy with failover capabilities of implementation data database data, two copies of a data library file backup for example, (RAID mirror image), thus also can greatly improve the reliability of standby system.
3,, no longer need the database recovery operation of wasting time and energy very much, and can carry out in real time simply and easily to the inquiry of Backup Data.
Claims (20)
1, the compression method of database back-up data, its main characteristic is:
When data of database backs up, do not compress processing, but the backup information of earlier database table being derived forms data file, more such data file is compressed processing in small data piece (for example X KB) mode.
2, the compression method of database back-up data as claimed in claim 1, when excessive by the formed data file of backup information of database table derivation, (for example XGB) during the inconvenience compression, is divided into bigger data block capacity (for example X MB) with it and compresses processing.
3, the compression method of database back-up data as claimed in claim 1, when the table data of derived data storehouse, with its storehouse list structure information (as field name, field length, field data types and constraint condition etc.), derive in the lump, and form backup data files with the data that derive by database table.
4, the compression method of database back-up data as claimed in claim 1, the field formula information with database table is derived forms structured data file; With the large object data of database table appointment, form the unstructured data file.
5, the compression method of database back-up data as claimed in claim 1 with the backup data files title of database table title and its formation, is set up the corresponding title table of comparisons.
6, the compression method of database back-up data, its main characteristic is:
To the compression of data file, according to its different file type, system adopts different compress modes automatically, does not for example compress Zip compression, JPEG compression etc.
7, as the compression method of claim 6 described database back-up datas,, can preset its compress mode to its each large object data LOB, and each large object data be compressed by default compress mode for set Database Systems.
8, the squeeze operation of claim 6, or undertaken, or undertaken by hardware by software, or combine with hardware by software and to carry out.
9, the squeeze operation of claim 7, or undertaken, or undertaken by hardware by software, or combine with hardware by software and to carry out.
10, the search method of database back-up data, its main characteristic is:
Also be kept at the Backup Data in the corresponding data file on the backup file server by the database table derivation, it does not imported in the former database table again and retrieve, and directly this backup data files is carried out retrieval process by application program.
11, as the search method of the database back-up data of claim 10, wherein application program provides and the same or analogous search interface of online data library searching for the user, according to the search condition of user's input, determines to answer data retrieved storehouse table; According to the title table of comparisons of database table and its backup data files, need to determine the backup data files of retrieval again.
12, as the search method of the database back-up data of claim 10, wherein application program is used the structural information of associated databases table when directly backup data files being retrieved.This structural information is to be included in the data file that is retrieved, or obtain by database server.
13, as the search method of the database back-up data of claim 10, when the data file is retrieved, according to corresponding database list structure information,, every data recording of data file is compared operation by application program by whole search conditions of user input.To satisfy the data recording of whole search conditions simultaneously, list the result for retrieval file in.
14, as the search method of the database back-up data of claim 10, when the data file is retrieved, by the structural information of application program according to its associated databases table, by each search condition of user's input, the respective field to the data record compares operation successively.Elder generation compares by the respective field of every data recording of first search condition and data file, and qualified data recording is charged to first temporary file; And then, carry out the compare operation of second search condition to each bar data recording of first temporary file, form second temporary file again; And the like, N temporary file of N (last) search condition formation, as the result for retrieval file.
15, as the search method of the database back-up data of claim 10, when data file had index and ordering, the compare operation of then above-mentioned search condition and data recording was only carried out in the data recording scope of index qualification.
16, the search method of database filing data, its main characteristic is:
Derive the Backup Data that also has been kept on the backup file server by database table, it is not imported former database table again and retrieve, but create the volatile data base table that is specifically designed to the filing data retrieval again.
17, the search method of database filing data as claimed in claim 16 wherein is used for filing data
The volatile data base table of retrieval is structured on the independent database management system platform.
18, the search method of database filing data as claimed in claim 16 wherein is used for the volatile data base table that filing data is retrieved, and is structured on the original data base administration platform, but will creates independently table space for it.
19, the search method of database filing data as claimed in claim 16, wherein application program provides and the same or analogous search interface of online data library searching for the user, search condition according to user's input, determine to answer data retrieved storehouse table, according to the title table of comparisons of database table and its backup data files, need to determine the backup data files of retrieval again.
20, the search method of database filing data as claimed in claim 16, used storehouse list structure information when wherein creating the volatile data base table is included in the filing data file, or from professional database server, obtain.
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