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 />
LCR<br />
Log Cleans Ratio<br />
You Can Expect More<br />
⎛<br />
⎞<br />
⎜<br />
⎟<br />
⎜<br />
lsn.<br />
gap.<br />
cleaner.<br />
triggers<br />
⎟<br />
= ⎜<br />
* 100<br />
⎛ dirt.<br />
page.<br />
steal.<br />
cleaner.<br />
triggers + lsn.<br />
gap.<br />
cleaner.<br />
triggers ⎞<br />
⎟<br />
⎜<br />
⎟<br />
⎜<br />
⎜<br />
⎟<br />
. . . .<br />
⎟<br />
⎝ ⎝ + dirty page threshold cleaners triggers ⎠ ⎠<br />
– Has an affect on recovery times<br />
– Too small or too large could be detrimental to buffer<br />
pool performance<br />
– Affected by SOFTMAX DB CONFIG parameter<br />
– 0 if ALTERNATE_PAGE_CLEANING=ON