Re: Trace file does not list detailed timings

Is this a case of: 9i and

    It used to show stats when I switched on SQL_TRACE,     but it doesn't any more after an upgrade.

If so, then it's a change in default behaviour. In earlier versions of 9, when you enabled sql_trace, you implicitly enabled "_rowsource_execution_statistics". The most recent versions don't do this. If you want them, then

    alter session set "_rowsource_execution_statistics"=true;

The cost is significant in some classes of query - nested loops seem to be the worst. I have an example where the CPU time goes up by a factor of three when stats are on.

Regards

Jonathan Lewis

http://www.jlcomp.demon.co.uk/faq/ind_faq.html The Co-operative Oracle Users' FAQ

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• Original Message ----- From: <Jill.Drocea_at_VerizonWireless.com> To: <oracle-l_at_freelists.org> Sent: Friday, January 27, 2006 10:31 PM Subject: Trace file does not list detailed timings

My trace file does not contain details...i.e.

TABLE ACCESS BY INDEX ROWID OTAPA_REQUEST_QUEUE (cr=2 pr=0 pw=0 time=91 us)

Instead shows

TABLE ACCESS BY INDEX ROWID OTAPA_REQUEST_QUEUE What am I missing?

Jill Drocea
Oracle DBA
Verizon Wireless
845-365-7465
Jill.Drocea_at_verizonwireless.com

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http://www.freelists.org/webpage/oracle-l Received on Fri Jan 27 2006 - 16:42:56 CST