Re: db file sequential read

Charlie,

    Cary provided some really good info on some things to look at, but I'm going on a really wild hunch here (well, okay, so I actually have a few different thoughts on it and not just one hunch)...so some further information would be needed.

    INVENTORY_LOCATION sounds like a good associative table between INVENTORY and LOCATION (for keeping tabs on bin locations). If this is the case, what are the primary key columns (and how are they defined...char, varchar, number, number(<value>), etc) for all three of these tables? Do INVENTORY or LOCATION have concatenated primary keys (and do those inherit foreign key fields as part of the primary key from other tables)...or do the tables use sequences for a mock primary key? Also, does INVENTORY_LOCATION have any child tables that have a foreign key reference to it?

Jeffery Stevenson
Chief Databeast Slayer
Medical Present Value, Inc.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Tuesday, November 19, 2002 8:54 AM

>
> I'm search of perfection in an imperfect world.
> This problem involves a V7.3.4.5 DB on V2.6 Solaris.
>
> As part of our nightwork batch processing, a bunch of reports are run
> against the DB.
> I have a DBMS_JOB which reports when processes are waiting for events like
> "db file sequential read". I typically get an email showing about 2 dozen
> sessions
> with wait times of 3 - 15 seconds all of which are doing one block reads
> against
> P_INVLOC; which is the Primary Key for the Inventory_Location table. This
> index
> has INITRANS=31 & FREELISTS=31. This is a decent sized index at about
> 128MB.
>
> I'm open for suggestion WRT what else can & could be done to eliminate or
> reduce these waits.
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
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> Author:
> INET: Charlie_Mengler_at_HomeDepot.com
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jeffery Stevenson
  INET: dba_at_darkora.net

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
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