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RE: A danger in cloning databases

From: MacGregor, Ian A. <ian_at_SLAC.Stanford.EDU>
Date: Wed, 11 Jul 2001 09:08:38 -0700
Message-ID: <F001.003474BC.20010711082729@fatcity.com>

Another thing to watch are the dbms_job entries, especially ones which interact with other databases. For example a job which pulls data from another database and writes back to that database the success of its efforts. If this job were to run in the clone, it might perform this task before the "real" database does. Jobs such as these should first check to see that they are running on the proper database before executing.

Ian MacGregor
Stanford Linear Accelerator Center
ian_at_slac.stanford.edu

-----Original Message-----
Sent: Wednesday, July 11, 2001 7:57 AM
To: Multiple recipients of list ORACLE-L

Many of you probably know this already, but it took me by surprise (and caused no end of grief) so I thought I'd warn people.

I cloned our 8.0.4 production database onto another machine for some testing we were doing (copy of entire Oracle filesystem, copied hot backup over) and started it up with no problems.

What I didn't realize when I ran my shutdown script (which also stops the listener) was that I hadn't changed the hostname in listener.ora. It stopped the listener on the production box!

Had you asked me before this happened I wouldn't have expected it to work that way, but a number of irate users and managers testify to the fact that it does. I restarted the listener as soon as anyone thought to notify me of the problem (it says something about the processes here that it was 45 minutes after I restarted the listener that that our Help Desk contacted me me about the problem, I first heard about it from a developer).

Sigh, learn something new every day.
Hope someone out there benefits from my mistake.

Jay Miller
--

Please see the official ORACLE-L FAQ: http://www.orafaq.com
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Author: Miller, Jay
  INET: JayMiller_at_TDWaterhouse.com

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Author: MacGregor, Ian A.
  INET: ian_at_SLAC.Stanford.EDU
Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
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