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https://issues.apache.org/jira/browse/DERBY-5772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-5772:
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Attachment: pagecache-counters.diff
The attached patch [^pagecache-counters.diff] shows how one might add an MBean
that lets you monitor hit count, miss count and eviction count for the page
cache via JMX.
It's just an example. A complete patch would have to make the MBean check that
SystemPermission("engine", "monitor") is granted before returning any data, it
would need functional tests, and we should also run performance tests to verify
that the counters don't add any noticeable overhead.
> Give users a way to monitor more Derby internals.
> --------------------------------------------------
>
> Key: DERBY-5772
> URL: https://issues.apache.org/jira/browse/DERBY-5772
> Project: Derby
> Issue Type: Improvement
> Components: JMX, Tools
> Affects Versions: 10.9.1.0
> Reporter: Rick Hillegas
> Attachments: pagecache-counters.diff
>
>
> We should give users a way to track hits/misses in the page cache. This will
> help users tune the size of the page cache. JMX-visible monitors might be a
> useful solution here. See the following email thread:
> http://old.nabble.com/Cache-Hit-Miss-rates-for-Derby-pageCache-to33865646.html#a33865646
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