Possible to have a sql server 2005 instance on a 2008 install?

  • Is it possible to have sql server 2005 coexist with 2008 on a cluster? If yes, do I install 2008 and then install 2005 as another instance? What issues will we possibly see with this? Thanks!

  • why would you do this? I would think you would just change the compatibility of the database that needs SQL 2005 to SQL 2005.

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  • One reason to do this is to have tempdb in different compatibility. If you have a user database in 2005 compatibility on a 2008 instance any code using tempdb will be run in the tempdb's compatibility mode, which would be 2008. Might cause issues, might not.

    There are no issues having a 2005 and 2008 instance on same server. I cannot comment on cluster as I have not attempted that type of setup but I cannot think of any reason why it would not work. You would just need to be aware that any shared resources would most likely be 2008.

    Bob
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  • Yes the vendor was very adamant about keeping the versions separate. So would I install 2008 and then an instance of 2005?

  • Should I choose a different folder for the components install rather than the default?

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