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From Daniel John Debrunner <...@apache.org>
Subject Re: How to set the percentage of dirty pages in cache pages?
Date Thu, 08 Feb 2007 16:33:13 GMT
Raymond Raymond wrote:
> I am doing some tests on Derby checkpoint. You know, with the
> same number of cache pages, if the percentage of dirty pages is
> higher, deby will dump more pages during checkpoint. I want to
> see what impact it will give to Derby's performance when I tune
> the percentage of dirty pages higher. As I observed, the default
> percentage is like 20%. But I don't know how to set it as the
> number I want.

My guess is that the "default percentage" you are seeing is the result 
of the workload you are using. I don't believe Derby has any concept of 
an optimal or default dirty page percentage.

Dan.




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