Oracle-L: RE: CPU Problem

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Thu, 07 Nov 2002 13:24:02 -0800
Message-ID: <F001.004FE5C5.20021107132402@fatcity.com>

Hamid - Does the system performance become sluggish for other users during this time? My offhand guess is that the subquery is repeatedly scanning data blocks it has loaded in memory. Have you used EXPLAIN PLAN? Can you run STATSPACK during this situation? Or if you find it easier, examine V$SESSION_WAIT or V$SESSION_EVENT to see what your system waits are. Bear in mind that you must check the difference in values over a time interval, something STATSPACK will do for you.

Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Thursday, November 07, 2002 3:04 PM To: Multiple recipients of list ORACLE-L

Hi List,

We are facing with some CPU problem (cpu 100% usage!), Just want to get some idea from you guys, any clue what can cause this problem: Here is a copy of some part of ora.ini
This happen during usage of some long query with subquery, this can be the cause of problem or just some wrong setting in ini file. I appreciate your help.

compatible = 8.1.7.4

db_block_buffers = 10000
db_block_lru_latches = 4
db_block_size = 8192
db_file_multiblock_read_count = 16

hash_area_size = 2048000
java_pool_size = 20971520
large_pool_size = 614400

log_buffer = 262144
log_checkpoint_interval = 10000
log_checkpoint_timeout = 1800
max_enabled_roles = 30

open_cursors = 300
optimizer_index_caching = 90
optimizer_index_cost_adj = 35
os_authent_prefix = ""
processes = 100
session_cached_cursors = 100
shared_pool_size = 134217728
sort_area_retained_size = 262144
sort_area_size = 262144
timed_statistics = TRUE

Hamid Alavi
Office 818 737-0526
Cell 818 416-5095

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Author: Hamid Alavi
INET: hamid.alavi_at_quovadx.com

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Author: DENNIS WILLIAMS
INET: DWILLIAMS_at_LIFETOUCH.COM

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