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Re: Does dataguard require same o/s release on both servers

From: Carel-Jan Engel <>
Date: Mon, 19 Nov 2007 22:17:38 +0100
Message-Id: <>

Hi William,

From :

2.3.1 Hardware and Operating System Requirements

The following list describes hardware and operating system requirements for using Data Guard:

        For example, this means a Data Guard configuration with a
        primary database on a 32-bit Linux on Intel system can have a
        standby database that is configured on a 32-bit Linux on Intel
        system. However, a primary database on a 64-bit HP-UX system can
        also be configured with a standby database on a 32-bit HP-UX
        system, as long as both servers are running 32-bit images.
      * The hardware (for example, the number of CPUs, memory size,
        storage configuration) can be different between the primary and
        standby systems.
        If the standby system is smaller than the primary system, you
        may have to restrict the work that can be done on the standby
        system after a switchover or failover. The standby system must
        have enough resources available to receive and apply all redo
        data from the primary database. The logical standby database
        requires additional resources to translate the redo data into
        SQL statements and then execute the SQL on the logical standby
      * The operating system running on the primary and standby
        locations must be the same, but the operating system release
        does not need to be the same. In addition, the standby database
        can use a different directory structure from the primary

My main question is: Why would you run different OS's? Regarding HA, both symmetry and simplicity rule.

Best regards,

Carel-Jan Engel

If you think education is expensive, try ignorance. (Derek Bok) ===

On Mon, 2007-11-19 at 12:19 -0800, William Wagman wrote:

> Greetings,
> We are looking at implementing dataguard, Enterprise Edition
> Oracle on Red Hat Linux. The question has been raised as to whether the
> O/S version must be the same on the primary and the standby. If the
> primary were to run RHEL4 and the standby were to be running RHEL5 would
> that create problems? I have not found any documentation indicating a
> requirement that the O/S be at the same release.
> Thanks.
> Bill Wagman
> Univ. of California at Davis
> IET Campus Data Center
> (530) 754-6208
> --

Received on Mon Nov 19 2007 - 15:17:38 CST

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