RE: Space Contention and LOG_BUFFER size

From: <Jared.Still_at_radisys.com>
Date: Wed, 31 Jul 2002 09:38:29 -0800
Message-ID: <F001.004A7A19.20020731093829@fatcity.com>

But are you getting unreasonable wait times for the buffer?

Jared

"Farnsworth, Dave" <DFarnsworth_at_Ashleyfurniture.com> Sent by: root_at_fatcity.com
07/31/2002 05:33 AM
Please respond to ORACLE-L  

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Subject:        RE: Space Contention and LOG_BUFFER size

My LOG_BUFFER = 32768

This seems a bit small.

-----Original Message-----
Sent: Wednesday, July 31, 2002 6:13 AM
To: Multiple recipients of list ORACLE-L

No it does not - but the 'redo log space requests' (imho) is not a good stat for log buffer space sizing, since its common to get this number going up when you switch logs (because briefly everyone is told 'hands off the log buffer').

I prefer the 'log buffer space' wait in
v$system_event, v$session_event. Its rare in "typical" systems for a log buffer over (say) 512-1024k to provide any benefit.

hth
connor

• "Farnsworth, Dave" <DFarnsworth_at_Ashleyfurniture.com> wrote: > I am doing some performance monitoring on an 8.1.7
  > DB on Windoze. I ran the following query;
  >
  > SQL> select name,value
  > 2 from v$sysstat
  > 3 where name = 'redo log space requests';
  >
  > NAME
  > VALUE
  >

  ---

  
  > ----------
  > redo log space requests
  > 27
  >
  >
  > If the number of 'redo log space requests' is much
  > over zero then I should increase the LOG_BUFFER size
  > in my init.ora, at least that is what I get from
  > RTFM. One question I have is that does the size of
  > the LOG_BUFFER parameter have to be a multiple of
  > the DB_BLOCK_SIZE parameter? I vaguely remember
  > that it shuold be but have not found anything in TFM
  > to verify this.
  >
  > Thanks,
  >
  > Dave
  > --
  > Please see the official ORACLE-L FAQ:
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  > Author: Farnsworth, Dave
  > INET: DFarnsworth_at_Ashleyfurniture.com
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Connor McDonald
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Received on Wed Jul 31 2002 - 12:38:29 CDT