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RE: Multiple installed versions of Oracle

From: John Kanagaraj <>
Date: Thu, 7 Apr 2005 14:46:03 -0700
Message-ID: <>


There is absolutely no truth to either the original statement of non-coexistence, or Oracle support for not mixing versions. I have run 8.1.7, 9.2.x and 10.1 on the same Solaris box (and 7/8/9 on other platforms). Talk to your manager, along with a bean counter who will oppose buying anything extra for additional support.

John Kanagaraj <><
DB Soft Inc
Phone: 408-970-7002 (W)  

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-----Original Message-----

From: [] On Behalf Of Tracy Rahmlow
Sent: Tuesday, April 05, 2005 7:55 AM
Subject: Multiple installed versions of Oracle

We are in the process of upgrading several databases from 8i on AIX 4.3.3 to 9 on AIX 5.2 or 10g on AIX 5.2. The target version depends upon whether or not the application is supported on 10g or not. If not will be migrating toward 9.
The manager of the unix area has indicated that he has seen issues at his previous shop with co-locating multiple versions of Oracle on the same server and is basically not allowing the practice. I have never seen or heard of this issue, but am trying to remain open-minded to his concern. Here are his statements verbatim:

Several occasions where server and db crashed due to dba administering db in an incorrect manner. IE mistook one version for the other. Applied the incorrect maintenance patch to the incorrect instance.

Several occasions where db versions did not play nice together 7.3.4 and 8i.

All occasions impacted SLA's and one instance required restore of db due to corrupt data.

I also contacted two DBA Manager friends and they are aware Oracle supports this strategy, however, both shops have standards in place that do not permit this practice - due primarily to the above incidents and to keep the environments simple / less complex. Does this make the planning of upgrades and maintenance a little more difficult - yes, but they both agreed that this best practice has solved many headaches and saved many hours of work.

Prior to his arrival we did have success running 7 and 8 on the same server. Frankly, I do not think the restriction is warranted. So what are your thoughts? And if you agree with me help me make a case for changing his mind. To complicate matters, he has more authority than me. Thanks

Tracy Rahmlow
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-- Received on Thu Apr 07 2005 - 18:56:53 CDT

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