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((Re)): db_file_mutliblock_read_count and physical IO

From: <ryan.gaffuri_at_comcast.net>
Date: Wed, 18 Aug 2004 18:24:46 +0000
Message-Id: <081820041824.28397.41239EEE0003F72400006EED2200758942079D9A00000E09D2020E979D@comcast.net>


200 MBs. I tried it on a variety of different tables. Many over a a gigabyte. No difference in total physical IO in my tkprof output. I read the raw trace file. db_file_scattered_read with a p3 value = 128 and a value = 8(for two different traces). so both settings are taking.
-------------- Original message --------------

> Ryan,
> Was the data retrieved less than or equal to 8k? If it was than the
> I/O should be the same as it will only retrieve the data that is needed
> no matter what the db_file_multiblock_read_count(MBRC) is. Try the same
> test making sure that the data you need it larger than the MBRC and
> compare the results.
> Just a thought.
> Ron
>



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Received on Wed Aug 18 2004 - 13:27:50 CDT

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