Thanks a lot , Srini !
I have this feeling too.
Unfortunately , bouncing the instance is not an option at the moment (it's
up since March , 2001).
The other problem is , when i'll restart the instance , the statistics will
disappear , so i never know my hit ratio ;-(
-----Original Message-----
Sent: Tuesday, August 07, 2001 9:47 PM
To: Multiple recipients of list ORACLE-L
Kirti, Audrey,
I was under the impression that negative numbers are caused by the numbers
wrapping around i.e., the database has been up for a while and the
statistics pile up and eventually exceed the defined format (e.g. value of
1000+ for a format of 9(3) - to use old COBOL representation !). Makes
sense ?
I have seen his before. If you bounce the database, all will be well !
Srini Chavali
Oracle DBA
Cummins Inc
"Deshpande, Kirti" <[EMAIL PROTECTED]>@fatcity.com on 08/07/2001
01:13:52 PM
Please respond to [EMAIL PROTECTED]
Sent by: [EMAIL PROTECTED]
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Andrey,
I am not into cache hit ratios, but got curious about your negative value.
So I casually searched Metalink for 'negative value for hit ratio'. And
got
a hit on 'MROC: I am receiving a negative Buffer Cache hit ratio' thread.
You may want to check it out, there seems to be a new formula for hit ratio
computation in 8i/9i.
HTH,
Regards,
- Kirti Deshpande
Verizon Information Services
http://www.superpages.com
> -----Original Message-----
> From: Andrey Bronfin [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, August 07, 2001 12:51 PM
> To: Multiple recipients of list ORACLE-L
> Subject: negative value for buffer cache hit ratio
>
>
> 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
>
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> Author: Andrey Bronfin
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