> 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.
 
thanks forSébastien Escudier's reply. but I am comfused that: First time
i used sqlite database A for query, and second time database B, and then the 
second query speed of another database (B) is still faster.    :(
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