8.1.7.2.5 interMedia Text Slow Sync

From: Jack C. Applewhite <japplewhite_at_inetprofit.com>
Date: Thu, 24 Jan 2002 07:51:12 -0800
Message-ID: <F001.003F9EB6.20020124073521@fatcity.com>

We are experiencing very slow interMedia Text resyncs ( CTX_DDL.Sync_Index ) under 8.1.7.2.5 on Win2k Server.

We upgraded from 8.1.6.0.0 to 8.1.7.2.5 earlier this month (both under Win2k Server) on essentially the same hardware. We used to see about 700-2000 CLOB documents per second indexed under 8.1.6, but now see only about 400-800. The low-high numbers relate to the size of the index being sync'd - low just before we roll out a monthly partition (total 2 million CLOBs), high just after (total 1 million CLOBs).

Query performance is better under 8.1.7 - partly because I spread the DR$<>$I table across 3 drives. By the looks of the I/O pattern, I should spread DR$<>$X (the index on DR$<>$I table) across 2 or 3 drives as well.

Anybody have any words of wisdom as to what I can do to speed things up?

BTW, I'm curious at how 8.1.7 balances I/O. While it's writing to the DR$<>$X segment, it doesn't write to the online redo logs - it waits until it's reading from DR$<>$X segment before it writes to the redo logs. I wonder why it doesn't do the writes to redo in parallel with the writes to DR$<>$X.

Thanks.

Jack

Jack C. Applewhite
Database Administrator/Developer
OCP Oracle8 DBA
iNetProfit, Inc.
Austin, Texas
www.iNetProfit.com
japplewhite_at_inetprofit.com
(512)327-9068

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Author: Jack C. Applewhite
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Received on Thu Jan 24 2002 - 09:51:12 CST