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From Rick Hillegas <rick.hille...@oracle.com>
Subject Re: Cache Hit/Miss rates for Derby pageCache
Date Fri, 18 May 2012 14:55:48 GMT
On 5/18/12 7:20 AM, Knut Anders Hatlen wrote:
> Mike Matrigali<mikem_app@sbcglobal.net>  writes:
>
>> On 5/17/2012 10:07 AM, David Zanter wrote:
>>> Does anyone know, is there a way to get derby statistics from a
>>> running system regarding the hit/miss rates for the Derby Page Cache.
>>>
>>> i.e.  Statistics that would help determine if the:
>>> derby.storage.pageCacheSize  was being effective or needs to be
>>> tweaked.
>>>
>>> ~David
>>>
>> cloudscape use to have this functionality, but I don't think it was
>> exposed in derby as it depended on non-standard vti's.  Does anyone
>> know if the jmx work provided this functionality.
> I don't think the JMX work exposed any statistics from the engine.
> Another problem is that we only collect statistics in Clock, whereas
> ConcurrentCache, which is the cache implementation we use on Java 5 and
> newer, does not collect any statistics currently.
>
> It would be useful functionality, so it's probably worth filing a JIRA
> issue for it.
>
I've logged DERBY-5772 to track this. Thanks.

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