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Re: wierd runstats_pkg report

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Tue, 23 Mar 2004 15:26:51 -0000
Message-ID: <00bf01c410eb$45d432b0$7102a8c0@Primary>

You don't have CPU usage in the stats.
The second run may be using far more CPU than the first, despite doing less latching.

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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

April 2004 Iceland
June 2004 UK - Optimising Oracle Seminar

: anyone ever see this much of a difference in latch contention and have the
query which uses more resources return faster? All I did was flip the join order. I can re-write the query and post it later.
:
: just curious if this has happened to anyone.
:
: SQL> exec runstats_pkg.rs_stop(500);
: Run1 ran in 1432 hsecs
: Run2 ran in 1740 hsecs
: run 1 ran in 82.3% of the time
:
: Name Run1 Run2 Diff
: STAT...buffer is not pinned co 2,233 1,570 -663
: LATCH.library cache pin alloca 1,095 233 -862
: LATCH.library cache pin 1,784 347 -1,437
: STAT...buffer is pinned count 3,303 1,768 -1,535
: STAT...index fetch by key 1,571 3 -1,568
: LATCH.shared pool 2,598 570 -2,028
: LATCH.library cache 3,423 835 -2,588
: STAT...consistent gets - exami 3,406 144 -3,262
: STAT...recursive calls 3,709 406 -3,303
: STAT...consistent gets 5,502 1,787 -3,715
: STAT...session logical reads 6,049 2,334 -3,715
: LATCH.cache buffers chains 10,692 6,384 -4,308
: STAT...session uga memory 7,936 0 -7,936
:
: Run1 latches total versus runs -- difference and pct
: Run1 Run2 Diff Pct
: 23,389 11,135 -12,254 210.05%
:
: PL/SQL procedure successfully completed.



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Received on Tue Mar 23 2004 - 10:49:42 CST

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