Uneven distribution of latches - what's next?
- From: Boris Dali <boris_dali@xxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 24 Dec 2004 06:30:14 -0800 (PST)
The subject says it all.
The distribution below (from v$latch_children for
latch# 157 - library cache):
CHILD# GETS MISSES SLEEPS WAIT_TIME
------ ---------- ---------- ---------- ----------
2 16597807 72387 333 1674350
1 34475788 203781 1254 4801328
7 27065517 241493 1284 5753591
8 33897775 440298 1718 14570006
4 60799550 676421 1833 11250799
10 62099645 922629 2881 11083064
6 52733583 818465 3384 21322498
3 56602708 883077 9150 49110401
9 65188664 1275753 10214 64507786
11 117460816 3227510 24170 133460244
5 3643740682 3001597195 23020516 6.2108E+12
So child latch 5 is the one getting hit the most by
far. I know exactly the reason/query that gets
soft-reparsed over and over, but is there **anything**
that can be done from a system/DB configuration
perfspective to:
- ease the load on CPUs pegging at a 100%
- make the distribution more even (would it improve
anything, e.g. decrease response time and/or overall
system load?)? Why child latch 5?
Thanks,
Boris Dali.
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