Re: Server Architecture

From: Dan Norris <>
Date: Thu, 3 Jan 2008 08:25:49 -0800 (PST)
Message-ID: <>

If they're all on the same patch level today, why introduce all the ORACLE_HOMEs today? Personally, I'd keep them all on the same ORACLE_HOME now and when one wants to patch and the others aren't ready, spin up a new ORACLE_HOME, patch it, then migrate the DB in question to use the new ORACLE_HOME at that point. That way, if you don't run into patching conflicts, you'll never need the extra ORACLE_HOMEs. Is there something wrong with my logic?


  • Original Message ---- From: Tanel Poder <> To: Sent: Thursday, January 3, 2008 10:05:40 AM Subject: RE: Server Architecture

One good
reason for separate sets of binaries is patching and patch testing on one database without affecting others.  

Having all
installations under different Unix users (and also groups in this case!) may be better for security but will make the everyday maintenance, refreshes etc probably harder... as you'll have various problems with permissioning and file access, need to constantly su between users, chmod/chown files etc... that's unless you want to chmod 777 all your directories & files, which would heavily go against the security principles again.  

I know quite
many shops which use a separate software installation (and set of database directories) for each database and it works well. You need to do more manual work for applying patches for all software installations (unless you use automatic provisioning of some sort), but you win in flexibility to patch/upgrade only selected databased in the server instead of all.  

different users for each database - this may be useful if you want fine-grained separation of duties - by database. However this approach will be useless if all your DBAs have access to all accounts anyway, in this case you will just make your life harder without gaining any benefit. So you should figure out if you really need all your Oracle installations under different unix usernames and whether the benefit outweighs the maintenance overhead.  

In summary

  • different oracle homes for each instance - YES
  • different unix user for each oracle installation - NO ( use single unix user and separate environment files for each instance ).
Tanel Poder


  [] On Behalf Of Andrew 
Sent: Thursday, January 03, 2008 21:56
Subject: Re: Server 

It does sound like a real maintenance nightmare.  What is the 
  problem they are trying to solve that requires 5 identical sets of binaries 
  under 5 different users, as opposed to (worst case normally), 1 set of 
  binaries and 5 instances? 

  On Jan 2, 2008 11:49 PM, Satheesh Babu.S <> 

 We have been proposed with following architecture by our 
    consultant. I need your expert opinion on this.
 Assume a 
    server got 5 database and all the databases running in same oracle version 
    and patchset. 
They are proposing to create 5 unix account. Each unix 
    account will have one oracle binaries and corresponding oracle DB. Apart 
    from that each unix account will have dedicated mountpoints. In broader 
    sense each unix account will be logically considered as one server. 

Received on Thu Jan 03 2008 - 10:25:49 CST

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