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From Øystein Grøvlen <Oystein.Grov...@Sun.COM>
Subject Re: [jira] Closed: (DERBY-704) Large page cache kills initial performance
Date Tue, 15 Nov 2005 20:20:06 GMT
Mike Matrigali wrote:
> Also I was wondering if you had any idea where the invalid pages
> were coming from?  The original problem with invalid pages was
> from drop tables, where applications didn't like it that we used
> all the pages in the cache when they were growing a single table
> to 1/2 the cache size and then dropping it.  So the invalid case
> was sort of special and wasn't expected to happen very often.
> The usual case should be the cache growing to full and then LRU'ing
> old pages to make for way for new ones.

I thought that when new cache items were added, the new pages will be 
invalid until they are used for the first time.  This is why this is 
only a problem while the cache is growing.


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