RE: Bind variable peeking and Dynamic sampling

From: Mark W. Farnham <mwf_at_rsiz.com>
Date: Tue, 8 May 2007 06:16:24 -0400
Message-ID: <007f01c79159$ef4a4f90$1100a8c0@rsiz.com>

I'm slightly confused - you want dynamic sampling AND stable plans?

If you truly know a set of "good enough" plans, why would you waste cycles on samples?

Regards,

mwf

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of fairlie rego
Sent: Tuesday, May 08, 2007 4:43 AM
To: Oracle-L
Subject: Bind variable peeking and Dynamic sampling

Hi,

I am at a site which is a high intensive OLTP site doing more than 400 txns/sec on a 8 node cluster on 10.1.0.5 RAC. We are thinking of switching off bind variable peeking and looking into an optimal value of dynamic sampling since we have plans flipping all the time and causing havoc.

I would like to know if there are any other customers who have disabled bind variable peeking and what value of dynamic sampling is being used by them

Thanks

Fairlie

Fairlie Rego
Senior Oracle Consultant

http://el-caro.blogspot.com/

M: +61 402 792 405

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Received on Tue May 08 2007 - 05:16:24 CDT