Understanding Buffer Pool Performance and ... - Quest Software
Understanding Buffer Pool Performance and ... - Quest Software
Understanding Buffer Pool Performance and ... - Quest Software
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<strong>Buffer</strong> <strong>Pool</strong> Overview<br />
Prefetch<br />
You Can Expect More<br />
• Prefetchers try to ensure that agents doing tablespace<br />
scans never wait for disk I/O<br />
• Agents send asynchronous read-ahead request to common<br />
prefetch queue<br />
• Prefetchers service the request by bringing the requested<br />
pages into the buffer pool<br />
• Should result in logical read, drive hit rate up<br />
• Two types:<br />
– List prefetch, efficiently reads a set of non-consecutive data pages<br />
– Sequential prefetch, reads consecutive pages
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