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Testing performance of queries (caching) [message #65433]

Mon, 20 September 2004 22:11

andy
Messages: 92
Registered: December 1999

Member

Hi,

I would like to compare the performance of 2 queries (namely how long it takes to query large sets of data). Now, when I run the first query, it takes a considerable amount of time to run, but subsequent runs will be instantaneous. I believe this is due to the db caching the results. Then when I run the second query, it would be fast as well.

How do yo test performance when the db uses caching?

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Re: Testing performance of queries (caching) [message #65437 is a reply to message #65433]

Tue, 21 September 2004 11:55

Frank Naude
Messages: 4587
Registered: April 1998

Senior Member

Hi,

From Oracle 10g, one can flush the DB Cache. Example:

SQL> ALTER SYSTEM FLUSH BUFFER_CACHE; 
 
System altered.

Best regards.

Frank

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