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IDS Forum

Re: How to disable cache/buffer when running t....

Posted By: rroussey@comcast.net
Date: Wednesday, 8 April 2009, at 3:49 p.m.

In Response To: RE: How to disable cache/buffer when running t.... (Scott MacKenzie)

Just like a mathematical proof in college:

"assume the opposite is true. to prove it wrong......"

Bob

----- Original Message -----
From: "Scott MacKenzie" <scottm@dinecollege.edu>
To: ids@iiug.org
Sent: Wednesday, April 8, 2009 10:15:21 AM GMT -05:00 US/Canada Eastern
Subject: RE: How to disable cache/buffer when running t.... [15483]

To add a third solution: Run a MASSIVE select on other tables before your test
query - that way the buffer cache will fill with other tables' data first. And
your query will be facing the same up-hill battle every time you run it!

-ScottM

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
Andreas.KUTSCHE@spar.at
Sent: Wednesday, April 08, 2009 3:28 AM
To: ids@iiug.org
Subject: AW: How to disable cache/buffer when running t.... [15479]

Hi,

IDS doesn't cache a result set but it caches the data/index pages needed to
create the result (if the buffer cache is reasonable large).

If you run a query for the first time (and no other query has requested that
data too) IDS has to read the tables/indexes from disk. The following query
executions will find all or some of the needed tables/indexes in the buffer
cache (memory).

There are two solutions:
1)
Run all of your test queries at least two times and compare only the second
run times.
2)
Start IDS with a very small buffer cache.

Regards,
Andreas

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-----Ursprngliche Nachricht-----

Von: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] Im Auftrag von jak aka
Gesendet: Mittwoch, 8. April 2009 11:19
An: ids@iiug.org
Betreff: How to disable cache/buffer when running the s.... [15478]

Hello ,

When I run a query , for the 1st time the query will take xx minute (ex. 10
minute) but if I run this query again , it will take only y minute (ex. 1
minute). I think IDS keep the result set in buffer/cache . When I run again ,
IDS map this query to the buffer/cache and retrieve the pre-run result set to
me.

My question is "how to disable this feature or to disable buffer/cache" ?

Because I 'd like to tune query and want to get the actual time using by this
query (after changing something such as index, statistics) but I cannot get
the actually time if I run this query again (not first time).

Best regards,
Jakkrit A.

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