It is possible that after 4 months your stats
have wrapped around the ( ? 64 bit ?) limit
value for your platform. Check the actual
values from v$sysstat to see if some of them
have gone negative or appear to be
'counting backwards'.
Jonathan Lewis
Seminars on getting the best out of Oracle
Last few places available for Sept 10th/11th
See http://www.jlcomp.demon.co.uk/seminar.html
-----Original Message-----
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
Date: 07 August 2001 19:52
|
|Dear gurus !
|I have a negative value for buffer cache hit ratio in my DB which is
up for
|some 4 months .
|Any ideas why ?
|Thanks in advance.
|
|SQL> SELECT (1 - (SUM(DECODE(a.name,'physical reads',value,0)) /
| 2 (SUM(DECODE(a.name,'consistent gets',value,0)) +
| 3 SUM(DECODE(a.name,'db block gets',value,0))))) * 100 "buffer
cache hit
|ratio"
| 4 FROM v$sysstat a;
|
|buffer cache hit ratio
|----------------------
| -52.99284
|
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|Author: Andrey Bronfin
| INET: [EMAIL PROTECTED]
|
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