Oracle FAQ | Your Portal to the Oracle Knowledge Grid |
![]() |
![]() |
Home -> Community -> Mailing Lists -> Oracle-L -> RE: Buffer Hit Ratio
Hi Leonardo,
Have a look at the tip on "Calculating the Cache Hit and Miss Rates" on the Ixora web site at http://www.ixora.com.au/tips/tuning/cache_miss.htm.
@ Regards,
@ Steve Adams
@ http://www.ixora.com.au/
@ http://www.christianity.net.au/
-----Original Message-----
From: Leonardo Fernandez [mailto:lfernand_at_cmsenergy.com]
Sent: Saturday, 21 October 2000 7:35
To: Multiple recipients of list ORACLE-L
Subject: Buffer Hit Ratio
Hi All,
What is the best SQL to determine Buffer Cache Hit Ratio?
I have the following scritps(orasnap), but I'm not convinced, because there are several scritps?
select sum(decode(NAME, 'consistent gets',VALUE, 0)) "consistent gets", sum(decode(NAME, 'db block gets',VALUE, 0)) "db block gets", sum(decode(NAME, 'physical reads',VALUE, 0)) "physical reads", round((sum(decode(name, 'consistent gets',value, 0)) + sum(decode(name, 'db block gets',value, 0)) - sum(decode(name, 'physical reads',value, 0))) / (sum(decode(name, 'consistent gets',value, 0)) + sum(decode(name, 'db block gets',value, 0))) * 100,2) "Hit Ratio" from sys.v_$sysstat
Please correct me if I am wrong. Thanks for your opinion ...
Regards,
Leonardo Fernández
-- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Leonardo Fernandez INET: lfernand_at_cmsenergy.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- 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 Fri Oct 20 2000 - 17:03:33 CDT
![]() |
![]() |