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Re: New instance vs. New schema

From: Arup Nanda <>
Date: Fri, 18 Apr 2003 20:26:37 -0800
Message-ID: <>

It depends on the Service Level Agreements (SLA) you have for teh application. All applications in a single a database are subject to the same uptime as the database; if the database is down all apps are down. When you apply a patch, or change a system parameter, the database must be shut down. Is that acceptable? If your new app needs a more stringent uptime requirement, then you would want to place that in a separate database.

Other factors to consider are - whether you will ever need to have a DR solution like a standby database. If so, you have to have a separate database. And what about backups? If your existing database users are quite ok with cold backups, but the new app needs a hot one, you would rather place that in a separate DB.

Downside to the multiple database approach - overheads associated with a separate instance may overwhelm memory in the machine; new backup recovry schemes should be designed and tested, etc.

Hope this helps.

Arup Nanda

  What would be the thought pattern when trying to determine whether to put a new application's data under a new instance vs. putting it into an existing instance with a new schema?

  Some ideas:

  1. Different maintenance requirements - 24x7 vs. 8-5
  2. OLTP vs. OLAP

  Any other ideas?

  Rick Stephenson

  Oracle Database Administrator

  Ovid Technologies, Inc.

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Author: Arup Nanda

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