RE: different redo needs same database
- From: "Juan Miranda" <j.miranda@xxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 7 Apr 2004 09:28:24 +0200
Hi
I think you have very very little
log_checkpoint_interval=5000
log_checkpoint_timeout
Your log block size is 1024 bytes ( try this as sysdba:
select max(lebsz) from sys.x$kccle; )
With these values you must have a checkpoint every 5 MB !!!
Review your alert.log
Another question,
Do you have each member of a group placed in separated volumns ?
If you have everything into a physical volume, there are no usefull.
Greetings.
-----Mensaje original-----
De: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] En
nombre de Jeroen van Sluisdam
Enviado el: martes, 06 de abril de 2004 10:28
Para: 'oracle-l@xxxxxxxxxxxxx'
Asunto: different redo needs same database
Hi,
I'm trying to improve my redo settings because I have logswitches during
daytime every
2 to 4 hours and at night during batches every couple of minutes and a few
times
within 1 minutes 2 logfile switches. With statspack (interval complete day
including night(
I also see
Avg
Total Wait wait Waits
Event Waits Timeouts Time (s) (ms) /txn
---------------------------- ------------ ---------- ---------- ------
--------
LGWR wait for redo copy 99,642 1,642 68 1 0.1
Details: Oracle 9.2.0.4, HP-UX 11.11,
I have 3 redo loggroups, each 2 members of 150Mb. All files are on a SAN
(EVA3000, raid 1)
SQL> show parameter log_check
NAME TYPE VALUE
------------------------------------ -----------
------------------------------
log_checkpoint_interval integer 5000
log_checkpoint_timeout integer 60
log_checkpoints_to_alert boolean TRUE
SQL> show parameter fast
NAME TYPE VALUE
------------------------------------ -----------
------------------------------
fast_start_io_target integer 0
fast_start_mttr_target integer 0
fast_start_parallel_rollback string LOW
I am thinking of maybe creating a script that creates small loggroups and
delete large groups for use during daytime
and creating another script with large loggroups for batch purpose. Any do's
and don't advice on these experiences are appreciated.
Tia,
Jeroen
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