Re: Veritas Quickio and DB_BLOCK_SIZE

That's a fairly sweeping statement to make without any justification - after all, at 2K:

    The block header is a much larger percentage     of the block size - so you lose space.

    The probability of wasting space from the PCTFREE     setting increases - so you lose space.

    The memory overhead due to x$bh is fixed per block,     so you use more memory to hold the same volume     (block size x block count) of data.

    Index depth may increase through having fewer     entries per branch block.

    Latch activity is likely to increase on range scans     because leaf blocks hold fewer entries - you get     the same effect on tables with clustered data -     and the effectiveness of IOTs will particularly be     reduced.

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

Host to The Co-Operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html

Author of:
Practical Oracle 8i: Building Efficient Databases

Screen saver or Life saver: http://www.ud.com Use spare CPU to assist in cancer research.

-----Original Message-----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: 02 October 2001 21:56

|If your application allows it, and if the Application
|will not change in the future, then use a 2k block
|size for OLTP database.
|
|If you are not sure on the application needs, then
|stick with 4k to be safe.
|

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Author: Jonathan Lewis
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