Oracle-L: Locally managed tablespaces and raw devices

From: Louis Avrami <avramil_at_concentric.net>
Date: Thu, 02 Oct 2003 11:14:40 -0800
Message-ID: <F001.005D1D6A.20031002111440@fatcity.com>

Hi all,

I just inherited an 8.1.7.4 database running on Solaris 2.8, 16 k block size, using raw devices for database datafiles. The raw slices all appear to be a uniform size, 200 meg each. As part of my initial site survey, I noticed that the tablespaces are all dictionary managed.

Would it be optimal to convert the existing application data and index tablespaces to locally managed tablespaces?

Does anyone know of any issues/problems when using locally managed tablespaces with raw devices?

Another question that I do have concerns the proper sizing of datafiles for new tablespaces. I have only utilized locally managed tablespaces on OS filesystems. With OS-level datafiles I usually create datafiles as a multiple of the OS filesystem block size + 64K for the bitmap header and metadata blocks. For example:

     OS block size       datafile size
     -------------       -------------
           8k            256 meg + 64k

With raw disk slices, the OS filesystem is bypassed. What then should be the optimal "formula" when creating new datafiles?

Thanks,
Lou Avrami

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Author: Louis Avrami
INET: avramil_at_concentric.net

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