Database compressing and decompressing method

Abstract

The invention discloses a database compressing method which comprises: establishing compressing method set for each type of database element group and numbering the compressing method; according to the type of the database element group to select corresponding compressing method and putting its number on the head of the compressed element group; compressing the property value with the method that corresponds to the number and putting the compressed property value in the compressed element group. The invention also discloses a database decompress method which comprises selecting the compress method number from the head of element group; decompressing the element group property value according to its compressing method; putting decompressed property value in the decompressed element group.

Description

technical field

[0001] The invention relates to the field of database system and information compression, in particular to a tuple-level database compression and decompression method. Background technique

[0002] In a large-scale database application system, it is often necessary to process hundreds of Gb or even Tb-level data, and these data are usually stored in large-scale disk arrays. On the one hand, the contribution of the use of large-scale disk arrays to system hardware costs cannot be underestimated; on the other hand, a large number of disk read and write operations also make input / output the main performance bottleneck of the system. If the database compression method is used to compress the stored data, the disk occupation of the data can be significantly reduced, thereby greatly reducing the hardware cost of the system, and at the same time improving the overall performance of the system.

[0003] Existing database compression products mainly include Winzip, W...

Images