Method and system for intra-row, inter-row compression and decompression of data items in a database using a page-based structure where allocating a page-buffer based on a stored value indicating the page size
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United States of America Patent
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Aug 3, 2010
Grant Date -
Jun 8, 2006
app pub date -
Dec 6, 2005
filing date -
Dec 6, 2004
priority date (Note) -
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Abstract
A database compression system includes a compression plug-in that allows a database to be compressed using multiple compression algorithms. As well, implementations of the present; invention allow inter-row compression to be used with fixed-page sizes in a page-based database. For example, the compression plug-in inter-row decompresses a requested page from sub-storage, and allocates a page buffer that corresponds at least to the size of the page data when inter-row decompressed. The compression plug-in then adds data to the page buffer using intra-row compression, such as gamma compression. When the page data is no longer needed, the compression plug-in compresses the page data using inter-row compression, and passes the compressed page data from the page buffer to the corresponding page, which is fixed in size, in sub-storage.
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