(((Re))): db_file_mutliblock_read_count and physical IO

From: ryan gaffuri <ryan.gaffuri_at_comcast.net>
Date: Wed, 18 Aug 2004 17:43:11 -0400
Message-ID: <009001c4856c$5c235c80$350a5444@ryan2le36ofjce>

so how do i determine by looking at trace files whether changing the db_file_multiblock_read_count makes a difference? I am assuming I should see a reduction in the sheer number of 'db file scattered reads' in my trace file correct?

this is more for general knowledge. I am not trying to tune by strictly focusing on physical IO.
----- Original Message -----
From: "Wolfgang Breitling" <breitliw_at_centrexcc.com> To: <oracle-l_at_freelists.org>
Sent: Wednesday, August 18, 2004 12:39 PM Subject: Re: db_file_mutliblock_read_count and physical IO

> tkprof summarizes and for "disk IO" it counts the number of blocks read,
> not the number of physical I/O. So if you have 1 scattered read that read
> 128 blocks, or 16 scattered read that each read 8 blocks, tkprof will
> report 128 "disk IO"
> That is one of the (many) reasons Cary advocates to look at the raw

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Received on Wed Aug 18 2004 - 16:38:51 CDT