RE: Re[2]: db_file_multiblock_read_count parameter

From: Steve Adams <steve.adams_at_ixora.com.au>
Date: Fri, 14 Jul 2000 09:53:12 +1000
Message-Id: <10557.112007@fatcity.com>

Hi Dick,

What makes you think that HP-UX has a limit of 32K per read? On buffered file systems all reads match the file system buffer size (normally 8K), but on raw or direct I/O you can go all the way up to MAXPHYS which has long been 256K and is now 1M.

Regards,
Steve Adams

http://www.ixora.com.au/
http://www.oreilly.com/catalog/orinternals/
http://www.christianity.net.au/


-----Original Message-----
From:	dgoulet_at_vicr.com [SMTP:dgoulet_at_vicr.com]
Sent:	Friday, July 14, 2000 1:09 AM
To:	Multiple recipients of list ORACLE-L
Subject:	Re[2]: db_file_multiblock_read_count parameter

One word of caution. If you raise this parameter too far the operating system may well ignore you. In HP-UX (the OS we use) the limit is 32K of data per read therefore taking the db_block_size of 8k means that any value of DB_FILE_MULTI_BLOCK_READ_COUNT > 4 gets ignored.

Dick Goulet

____________________Reply Separator____________________
Author: Gaja Krishna Vaidyanatha <gajav_at_yahoo.com>
Date:       7/12/00 3:36 PM

Prasada,

It is a dynamic parameter that can be modified using an "alter system" or an "alter session" as the case may be.

Cheers,

Gaja.

• Prasada R Gunda <Prasada.Gunda1_at_hartfordlife.com> wrote:
  >
  >
  > Hi All,
  >
  > We are using ETL(extraction,transformation and loading) tool
  > to load data from
  > source databases to warehouse database.
  > This tool allows us to write custom sql and does not allow DDL
  > statements.
  >
  > I am using full table scan on some of the tables in some sql
  > quries. I would
  > like to increase the value of db_file_multiblock_read_count
  > when I do FTS.
  >
  > Is there any way I could increase the
  > db_file_multiblock_read_count value other
  > than changing it in init.ora file.
  >
  > Thanks in advance for your help.
  >
  > Regards,
  > Prasad
  >
  >
  > --
  > Author: Prasada R Gunda
  > INET: Prasada.Gunda1_at_hartfordlife.com
  >
  > Fat City Network Services -- (858) 538-5051 FAX: (858)
  > 538-5051
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Gaja Krishna Vaidyanatha
Director, I-O Management Products
Quest Software Inc.
(972)-304-1170
gajav_at_yahoo.com

"Opinions and views expressed are my own and not of Quest"

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-- 
Author: Gaja Krishna Vaidyanatha
  INET: gajav_at_yahoo.com

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Received on Thu Jul 13 2000 - 18:53:12 CDT