Thanks,
As far as I know, the correct value is as close to 100% as possible.
So, if mine is 0.68
-------------------------*
MISS_RATE I
--------- I
0.67% I
I
This is now 9:15 am. I
-------------------------*
I find the performance of the DB good, but as the result of the query
I think that it could get better.
I executed this script that was posted yesterday in the list.
select to_char(100 * misses / (logical - physical + misses), '9990.00')
||
2 '%' miss_rate
3 from ( select total_waits misses
4 from sys.v_$system_event
5 where event = 'db file sequential read'),
6 ( select value physical
7 from sys.v_$sysstat
8 where name = 'physical reads'),
9 ( select sum(value) logical
10 from sys.v_$sysstat
11 where name like '%consistent read gets'
12 or name = 'db block gets');
Ramon Estevez
[EMAIL PROTECTED]
-----Mensaje original-----
De: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]En nombre de K
Gopalakrishnan
Enviado el: Tuesday, 07 August, 2001 5:07 PM
Para: Multiple recipients of list ORACLE-L
Asunto: RE: negative value for buffer cache hit ratio
Hi,
Generally speaking.. HIT RATIOS does not give the true
picture always. I have seen databases performing
extremely good with 50% and bad databases with 99% hit
ratio.
You should never decide the database performance based
on hit ratio and 90% hit ratio does not mean that 90%
of the data is ALWAYS read from the cache. It
translates in to something like this..A block is read
(consistent get) 9-10 times before written to disk..
You should check your system wide wait statistics for
better tuning..
--- Ramon Estevez <[EMAIL PROTECTED]>
wrote:
> Hi,
>
> My misses is
>
> MISS_RATE
> ---------
> 0.68%
>
> Is that good or bad, Oracle 8.0.5 Standard Edition,
> Windows 2000.
>
> Is there a 8.1.7 Standard Edition Version ?
>
> Ramon Estevez
> [EMAIL PROTECTED]
>
>
=====
Have a nice day !!
------------------------------------------------------------
Best Regards,
K Gopalakrishnan,
Bangalore, INDIA.
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