RE: checkpoint incomplete issue
- From: Freeman Robert - IL <FREEMANR@xxxxxxxx>
- To: 'susan lam ' <susanzlam@xxxxxxxxx>, "'oracle-l-bounce@xxxxxxxxxxxxx '" <oracle-l-bounce@xxxxxxxxxxxxx>, "'oracle-l@xxxxxxxxxxxxx '" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 18 Nov 2004 16:26:35 -0600
Even though a logfile has been archived, it's contents still need to be
written to disk via a checkpoint before it can be used again. This insures
that instance recovery is possible (you would have to do media recovery
after shutdown abort in some cases if this was not so).
So, what is happening is that your disks are not keeping up with the
checkpoint volume. Until the checkpoints can complete, your database will
just stall, waiting.
Look at your disks and see if there is something you can do to spread the IO
around better. This can mean more disks, or perhaps just moving some
datafiles around. I don't know if you are sititng on a SAN or JBODS, but
this is the area that you are most likley going to need to address.
Cheers,
Robert
Robert G. Freeman
Management Consultant
TUSC - The Oracle Experts www.tusc.com
OCP - 7, 8, 8i, 9i, 10g
Author:
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Oracle Database 10g New Features
Oracle9i RMAN Backup and Recovery
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
To: oracle-l@xxxxxxxxxxxxx
Sent: 11/18/2004 3:29 PM
Subject: checkpoint incomplete issue
I'm running a batch updates on my database and I've
been getting the following messages in my alert file:
"cannot allocate new log
check point incomplete."
My job hangs waiting on log file switch (checkpoint
incomplete) event.
I have 8 redo log groups (300MB members). When I did a
query on v$log, all of the log members' archived
status ='YES' except for the current member. So it
appears that the rest of the seven groups have been
archived but yet the database could not advanced to
the next redo log.
Furthermore, the alert.log does not show frequent log
switches. It switches log every 10mins and about every
5mins, the database complains
about "cannot allocate new log". Does not appear to be
a problem with the number or size of the redo logs.
Anyone has any idea what may be a possible problem?
checkpoint?
thanks.
susan
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