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Re: Convert to Locally-Managed Tablespaces

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Tue, 06 Jan 2004 03:34:25 -0800
Message-ID: <F001.005DBD6D.20040106033425@fatcity.com>

The answer is in my book.

Assume your original setting for pctfree is correct, by the time rows are full length, they are filling the block. If any rows are still part-grown, there will be the right amount of space left in the block for them to grow. If all the rows are new, there will be plenty of space to grow.

Inherently there is a 'right number' of rows that will fit a block when full grown.

Set the hakan factor to this, and when you move the table, each block will get exactly the right number of rows, with exactly the right amount of space left for any rows that need to grow to full size.

(However, due to a bug in the Hakan-related code,
you have to fiddle the Hakan factor by one for some functionality, as it is stored as N-1, rather than N - and some code uses N, some uses N-1 when working out how many rows go into a block. Details are in the book).

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

  The educated person is not the person
  who can answer the questions, but the
  person who can question the answers -- T. Schick Jr

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Good point about pctfree, but how could minimize records_per_block help in this case? Ive used it for optimizing bitmap indexes, but for table moving?

Tanel.

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Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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Received on Tue Jan 06 2004 - 05:34:25 CST

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