RE: Incremental checkpoints and CHECKPOINT_CHANGE#

Is the tablespace in backup mode?

From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On 
Behalf Of Jiang, Lu
Sent: Wednesday, January 13, 2010 3:54 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Incremental checkpoints and CHECKPOINT_CHANGE#

Hi DBA Gurus,

Does anyone know why checkpoint scn does not write to datafile header in the 
following scenario?

Parameter   log_checkpoint_timeout  = 1200

-- Incremental checkpoints show in alert.log:

Wed Jan 13 13:47:43 2010
Incremental checkpoint up to RBA [0x79e.1cacf6.0], current log tail at RBA 
[0x79e.1cb16a.0]
Wed Jan 13 14:07:43 2010
Incremental checkpoint up to RBA [0x79e.1cc865.0], current log tail at RBA 
[0x79e.1ccd64.0]
Wed Jan 13 14:27:47 2010
Incremental checkpoint up to RBA [0x79e.1ceb74.0], current log tail at RBA 
[0x79e.1d0193.0]
Wed Jan 13 14:47:47 2010
Incremental checkpoint up to RBA [0x79e.1d101b.0], current log tail at RBA 
[0x79e.1d12e2.0]

-- CHECKPOINT_CHANGE# has not been updated in v$datafile_header view, it stays 
with yesterdays check point info:

SQL> select distinct CHECKPOINT_CHANGE#, CHECKPOINT_TIME from v$datafile_header;

CHECKPOINT_CHANGE# CHECKPOINT_TIME
------------------ --------------------
         580705781 12-JAN-10

Thanks,
Lu

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