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.
Thanks.
Raymond
From: Bryan Pendleton <[EMAIL PROTECTED]>
Reply-To: <[email protected]>
To: [email protected]
Subject: Re: How to set the percentage of dirty pages in cache pages?
Date: Thu, 08 Feb 2007 07:27:11 -0800
Hi, everyone, is there any means to set the percentage of dirty pages
in cache pages? I think derby keeps a certain percentage of dirty pages
in memory, but I don't know how to change that.
Hi Raymond,
I don't know a direct answer to your question, sorry.
Isn't the amount of dirty pages in the cache something which is
changing constantly? Why would you want to set it?
Perhaps you mean you want to set some targets for triggering other
actions that might happen when the amount of dirty pages in the
cache reaches some level? If so, what are the other actions that
you want to trigger, and do you feel Derby's current mechanism for
triggering them isn't adequate?
thanks,
bryan
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