"physical, no written control point" is low, but increase in roll forward does not help.

We have a busy database, the physical write is so high that we want to reduce the physical writing. The statspack, we could see "physical writes non checkpoint" is low in comparison with 'physical writing', so I think the physical write results from control point is high, then I increased the size of Redo from 2 G to 4 G (now the command to log every 4 minutes). I hope that this may reduce the physical writing, but the fact is that the roll increased forward is powerless.
Statistic                                      Total     per Second    per Trans
--------------------------------- ------------------ -------------- ------------
physical writes                            8,298,681        9,210.5        249.8
physical writes non checkpoint             3,229,321        3,584.2         97.2
We use the oracle 10.2.0.3 on solaris 10, checkpoint-related parameters are
fast_start_io_target                          0                  
fast_start_mttr_target                        0                  
log_checkpoint_interval                       5000000            
log_checkpoint_timeout                        0    
Thank you

Published by: user646745 on August 18, 2009 01:24

FAST_START_MTTR_TARGET is set to 0

Make sure that you explicitly defined FAST_START_MTTR_TARGET on 0.
If you have not set it, a "show"parameter will be enabled see the value 0, but the automatic setting of the control point will be . (See Note MetaLink #265831.1)

If the size of redo is 4G, we will have two control points for each 4G...

Yes, there will be one for the log_checkpoint_interval and the other for the control of log file.

Tags: Database

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