Database compressing and decompressing method

A compression method and database technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of code table occupation, large space, increased processing overhead, etc., to achieve reduced processing overhead, high efficiency, and compression efficiency Improved effect

Active Publication Date: 2006-05-10
北京神舟航天软件技术股份有限公司
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Problems solved by technology

[0004] There are two main problems in using the above compression method for database compression: one is that the above compression method is suitable for compressing large text data with a high repetition rate of substrings, but the structural data mainly stored in the database does not have this feature, so It is impossible to obtain a good compression effect; the second is that the encoding table needs to occupy a large amount of space. Taking Winzip as an example, even if a data containing only one byte is compresse

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Embodiment Construction

[0039] like figure 1 Shown, database compression method of the present invention comprises:

[0040] Step 10) set up the compression method set of each attribute type of the database tuple, and number each compression method;

[0041] Step 11) According to the attribute type and value of the database tuple, select the compression method from the compression method set of the attribute type, and store the numbering of the compression method in the head of the compressed tuple;

[0042] Step 12) Using the compression method corresponding to the number of the compression method stored in the header of the compressed tuple to compress the attribute value of the database tuple, and storing the compressed attribute value in the compressed tuple.

[0043] The technical scheme of the database compression method of the present invention will be described in detail below by taking the information database of women of childbearing age of a provincial family planning committee as an exam...

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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

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Claims

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Application Information

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Owner 北京神舟航天软件技术股份有限公司
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