Re: database activity when mounted
- From: Hemant Chitale <hemantkchitale@xxxxxxxxx>
- To: Josh.Collier@xxxxxxxxxxxx
- Date: Thu, 4 Nov 2010 16:38:09 +0800
Did you get any responses? Have you done an OS trace of DBWR?
Hemant K Chitale
http://hemantoracledba.blogspot.com
sent from my smartphone
On Nov 2, 2010 6:48 AM, "Josh Collier" <Josh.Collier@xxxxxxxxxxxx> wrote:
I have a question for you.
What would cause activity on a filesystem that contains only datafiles when
the database is mounted?
My database is segregated so that control and redo files are isolated from
datafiles and tempfiles.
Normally what I expect is this
1. Database is in mounted state
2. Ckpt process is active on the mount that contains the control files
3. Lgwr process is active on the mount that contains the redo logs
4. Dbw0 process is active on the mount that contains the control and
redo logs.
Fuser –cu shows this activity.
However, very rapidly the dwb0 process will appear in the mounts that
contain only datafiles. This is messing me up as I am trying to unmount
them. I have been running the fuser every 2 seconds to a log and capture
the DWB0 process doing something on these mounts. The tool I am using
expects these devices to be able to be unmounted.
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