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Home -> Community -> Mailing Lists -> Oracle-L -> RE: buffer cache -once again
Dennis,
earlier my buffer cache was 300MB that time the cache hit ratio was 81% ,so i thought to increase the size by 100mb and incresed .but again the cache hit ratio is 81%.means the problem is not the buffer cache.
the top wait event is 'db file scattered read' ,i increased the db_file_multiblock_read_count from 16 to 64 but still this the top one wait event.
db version is 8.0.5 ,OS is AIX 4.3 on RS/6000.
pls suggest if need to correct something ...
Thanks
Arvind
-----Original Message-----
Sent: Tuesday, May 06, 2003 7:42 PM
To: Multiple recipients of list ORACLE-L
Arvind
What makes you suspect you've configured your buffer cache too large? A better question might be "how can I tell if my buffer cache is properly sized?". Start by checking your wait times. What are your top 3 waits? Also, what is your (cough, cough) average buffer hit ratio?
Dennis Williams
DBA, 60%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Tuesday, May 06, 2003 4:37 AM
To: Multiple recipients of list ORACLE-L
Dear All,
how can i check if my buffer cache is bigger than necessary ?oracle db version is 8.1.7.
Thanks
Arvind
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Arvind Kumar
INET: arvindk_at_sqlstarintl.com
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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: ListGuru_at_fatcity.com (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). Received on Thu May 08 2003 - 01:36:59 CDT
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