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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Evaluating <strong>Performance</strong> Metrics<br />
Index Hit Rate<br />
– Includes all index reads by buffer pool<br />
<strong>Buffer</strong>pool<br />
IHR<br />
=<br />
⎛<br />
⎜<br />
⎝<br />
– Low values = more physical IO<br />
– High values = more logical IO<br />
– 85 – 90% is a good starting point<br />
You Can Expect More<br />
bp.<br />
index.<br />
logical . reads<br />
bp.<br />
index.<br />
logical . reads + bp.<br />
index.<br />
physical . reads<br />
⎞<br />
⎟ * 100<br />
⎠