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. [EMAIL PROTECTED] -----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 ======================= Confidentiality Statement ======================= The information contained in this message and any attachments is intended only for the use of the individual or entity to which it is addressed, and may contain information that is PRIVILEGED, CONFIDENTIAL and exempt from disclosure under applicable law. If you have received this message in error, you are prohibited from copying, distributing, or using the information. Please contact the sender immediately by return e-mail and delete the original message from your system. ===================== End Confidentiality Statement ===================== -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Hamid Alavi INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: DENNIS WILLIAMS INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
