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 />
TCR<br />
Threshold Cleans Ratio<br />
– CHNGPGS_THRESH DB CONFIG parameter<br />
– Finding a “happy medium” is key<br />
– 0 if ALTERNATE_PAGE_CLEANING=ON<br />
You Can Expect More<br />
⎛<br />
⎞<br />
⎜<br />
⎟<br />
⎜ dirty.<br />
page.<br />
threshold . cleaner.<br />
triggers ⎟<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 cleaner triggers ⎠ ⎠