YASQ yet another YVERT Question

Hallo,

I wonder what makes V$ DATABASE. CONTROLFILE_CHANGE # increase.

CONTROL points of course are, as long as the PAPER PASSES.

In any case, I have observed that it changes also outside these events, in fact:
select 
        scn_to_timestamp(current_scn) "Current",
        scn_to_timestamp(checkpoint_change#) "Checkpoint",    
        scn_to_timestamp(controlfile_change#) "Controlfile"
from 
       v$database;


Current                             Checkpoint                          Controlfile                         
27/10/09 15:08:53,000000000         27/10/09 10:00:37,000000000         27/10/09 10:05:40,000000000      
but the last command of newspaper was at 10/27/09 10:00:37, 000000000, actually
select SEQUENCE#,STATUS,FIRST_CHANGE#,FIRST_TIME from v$log order by first_time desc;


SEQUENCE#                              STATUS           FIRST_CHANGE#                          FIRST_TIME        
728                                    CURRENT          24488675                               27/10/09 10.00.37 
727                                    INACTIVE         24459899                               26/10/09 22.23.59 
726                                    INACTIVE         24393696                               26/10/09 14.05.01 
It's about Oracle 10.2.0.4.

Thank you

ottocolori wrote:
Thank you very much friends!

So if you set log_checkpoints_to_alert set to TRUE, you should get the timings of checkpoints in the consistent alert with the timings of v$ database view YVERT?

Yes, and in addition to the alert log, V$ instance_recovery view also gives many details on the various types of control points that happens. You can use it as well. Also statistics on happening and writing done by DBWR because of that control points are stored in the V$ sysstat

SQL> select name from V$sysstat where lower(name) like '%checkpoint%';

NAME
----------------------------------------------------------------
physical writes non checkpoint
DBWR checkpoint buffers written
DBWR thread checkpoint buffers written
DBWR tablespace checkpoint buffers written
DBWR parallel query checkpoint buffers written
DBWR checkpoints
background checkpoints started
background checkpoints completed

8 rows selected.

SQL>

Control, the background checkpoint is the control point that happens in logfile aka control file checkpoint.

HTH
Aman...

Tags: Database

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