SYSTEM AND METHOD FOR PERFORMING CONTIGUOUS DISK READ ON PSEUDO-CONTIGUOUS DATA BLOCKS WITHIN A DATABASE MANAGEMENT SYSTEM
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United States of America Patent
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Issued Date -
Jun 21, 2012
app pub date -
Dec 17, 2010
filing date -
Dec 17, 2010
priority date (Note) -
Abandoned
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Abstract
A system and method to facilitate cache management and improve disk read performance for database systems with large memory and large disks. A contiguous read feature is employed to read multiple pseudo-contiguous data blocks in one large I/O from disk storage into cache memory. The contiguous read feature loads the disk area containing pseudo-contiguous data blocks by issuing a single disk read. A separate virtual space and memory page list is created for each data block, and the page lists are reunited to create one I/O. The pseudo-contiguity of two data blocks is determined by comparing the distance between them, i.e., the size of the hole between the two data blocks, with a predefined maximum distance, over which it is more effective to read the data blocks independently.
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