negative value for buffer cache hit ratio

From: Andrey Bronfin <andreyb_at_elrontelesoft.com>
Date: Tue, 07 Aug 2001 09:34:42 -0700
Message-ID: <F001.00362FD0.20010807095033@fatcity.com>

Dear gurus !
I have a negative value for buffer cache hit ratio in my DB which is up for some 4 months .
Any ideas why ?
Thanks in advance.

SQL> SELECT (1 - (SUM(DECODE(a.name,'physical reads',value,0)) /   2 (SUM(DECODE(a.name,'consistent gets',value,0)) +   3 SUM(DECODE(a.name,'db block gets',value,0))))) * 100 "buffer cache hit ratio"
  4 FROM v$sysstat a;

buffer cache hit ratio

---

             -52.99284

--

Please see the official ORACLE-L FAQ: http://www.orafaq.com
--

Author: Andrey Bronfin
  INET: andreyb_at_elrontelesoft.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 Tue Aug 07 2001 - 11:34:42 CDT