On Mon, 2011-09-05 at 12:23 +0800, 徐 wrote:
> For eg, the query like this: "select count(id) from tab1"  ,and the
> record number is above 100,000. If i can't restart my pc, the
> speed is quicker when i do the second query. 

This must be because the OS cached your database file into memory.


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