Is this the thread where Thomas says something about:
>I've done the same (recommend 2k blocks). It is true. I am serious.
2k is
>appropriate in some cases. some reasoning:
NOTE -- 'in some cases'
NOTE -- 'some reasoning'
and my follow-up post contains:
> Me too -
> Some more reasons:
(reasons cut)
> It all comes down to knowing the application,
> the environment, the usage patterns, the
> data distribution, and doing the arithmetic.
>
> Have to say though, that unless the file system
> allows for 2K writes (e.g. with Veritas direct I/O
> option) then you generally have to choose
> between an optimum Oracle blocksize and
> an optimum O/S blocksize or move to raw devices
NOTE -- 'some more reasons'
NOTE -- 'doing the arithmetic'
NOTE -- the warning about Oracle and O/S block sizes.
Neither Thomas nor I made a throwaway remark
suggesting a specific block size was appropriate -
we both stated that we had on occasions used
2K where appropriate. Nor did we add a valueless
caveat about 'the application being appropriate',
we actually gave concrete reasons why an application
may or may not be appropriate.
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 <[EMAIL PROTECTED]>
Date: 03 October 2001 20:03
|By the way, you are agreeing and disagreeing with
|Jonathan Lewis at the same time. The index efficiency
|on small block size is Jonathan's point he made a
|couple of years ago when he was stating why he
|recommends a 2k block size on an OLTP type database.
|The other index point (scanning an index on a small
|block size) is from Thomas Kyte on the same
|thread...If you disagree with him, you can write him
|an e-mail so you can correct him.
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