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RE: cdump, bdump, udump

From: Rajaram <>
Date: Tue, 15 May 2001 13:36:55 -0700
Message-ID: <>

  1. Space occupied by alert.log is freed once you delete the file.
  2. You may not see an immediate reclamation of free space. Try to do sync ( In solaris) and notice the free space. Also, try more than one method of free space checking - Using du, bdf, sam or sysadmin tools.

-----Original Message-----
From: Rao, Maheswara [] Sent: Tuesday, May 15, 2001 2:50 PM

To:     Multiple recipients of list ORACLE-L
Subject:        RE: cdump, bdump, udump


I tested this again now. I removed alert.log and then checked disk usage. It did not release the disk space. Then I bounced the db. Now, the disk space is released.

Environment: Solaris 7, 64 bit. Oracle 817.


-----Original Message-----
Sent: Tuesday, May 15, 2001 12:36 PM
To: Multiple recipients of list ORACLE-L

On Solaris 2.5, 2.6 and 2.7, as well as AIX we have removed the alert.log and
space has immediately become free. (Not true with the listener.log however).


"Rao, Maheswara" wrote:

> Ron,
> You would not be able free the disk space even if alert.log is deleted.
> example, if alert.log file size is 500 MB size and then you delete the
> alert.log, still you would not be able to get a disk free space of 500
> This space would be released once you bounce the database.
> The above scenario is similar even if you copy alert.log to a different
> location and then delete the rows.
> The above scenario applies to Solaris environment. I do not know what
> happens in NT environment.
> Rao
> -----Original Message-----
> Sent: Wednesday, April 25, 2001 10:39 AM
> To: Multiple recipients of list ORACLE-L
> Team,
> Correct me if I am wrong, please.. If you delete the alert.log file with
> database up and running, the oracle still thinks the file exists and
> to a non existant file that you can't "see". The proper method of
> the file size is to copy the file to a backup location, and edit the
> original and delete rows from the file. OR if you do not need to keep the
> original log for analysis you could copu /dev/null > alert.log.
> Just a house keeping note.
> ROR ma?am
> >>> 04/24/01 09:21AM >>>
> Sinardy,
> First, I suggest you find some time and sit down and READ the Oracle
> documentation. Otherwise you are going to get a large number of "RTFM"
> emails, and some flaming as well.
> Now.. the alert log is created (if it does not already exist) or written
> every time Oracle wants to record an event that has happened in the
> database/instance. So log switches will be in there, database shutdown
> startup messages, errors dealing with the infrastructure of the database
> (failure to extend a rollback segment, failure to get space in the temp
> segment, disasterous database errors etc) There are other messages as
> I'm not going to list every one.
> Bdump contains trace files that relate to the Oracle background process


> anything generated by smon, pmon, etc
> Udump contains trace files that relate to specific user Oracle processes
> Cdump contains core dumps, associated with one or another trace files in
> bdump directory.
> Rachel
> >From: "Sinardy Xing" <>
> >Reply-To:
> >To: Multiple recipients of list ORACLE-L <>
> >Subject: RE: cdump, bdump, udump
> >Date: Tue, 24 Apr 2001 03:40:27 -0800
> >
> >Hi all,
> >
> >When those logs will created ?
> >
> >Thank you
> >
> >Sinardy
> >
> >
> >-----Original Message-----
> >Sent: Tuesday, 24 April 2001 9:41 AM
> >To: LazyDBA mailing list
> >
> >
> >Hi DBAs and SAs,
> >
> >I had a task to do housekeep ...\bdump\alertSID.log
> >What logs usually Oracle system need to housekeep, and what are these
> >directory
> > cdump,
> > bdump and
> > udump
> >for ?
> >
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Received on Tue May 15 2001 - 15:36:55 CDT

Original text of this message