RE: Delete slowing..

From: Mark Leith <mark_at_cool-tools.co.uk>
Date: Tue, 27 Nov 2001 15:02:04 -0800
Message-ID: <F001.003CE3CF.20011127144025@fatcity.com>

Thanks for all your input - I'll be following up on this tomorrow morning, and will let you all know..

Cheers

Mark

-----Original Message-----

Sent: 27 November 2001 20:45
To: Multiple recipients of list ORACLE-L

Also check for a delete trigger on the table.

Ron Thomas
Hypercom, Inc
rthomas_at_hypercom.com

                    NDATFM_at_labor.s
                    tate.ny.us            To:     ORACLE-L_at_fatcity.com
                    Sent by:              cc:
                    root_at_fatcity.c        Subject:     RE: Delete slowing..
                    om


                    11/27/01 12:30
                    PM
                    Please respond
                    to ORACLE-L

Mark,

check for foreign key/missing index combinations. If the table is a parent table, and it's child's foreign key's column is not indexed, the delete can take *forever* if the child is a large table.

Tom Mercadante
Oracle Certified Professional

-----Original Message-----

Sent: Tuesday, November 27, 2001 1:55 PM To: Multiple recipients of list ORACLE-L

Hi list people :)

We have a customer who has been running a particular delete statement against a table for a while now, which usually ran within minutes. All of a sudden this table has suddenly gone from a few minutes right up to 50! He wants to diagnose why..

Where would you start?

I have a few ideas of my own - like stale stats, small rollback segments etc. - but am after some of your advice also before I get back to him tomorrow morning.. Not sure on the Oracle version, OS, or even amount of rows he is deleting or size of the table (yet, I'll find this out tomorrow), but there has to be a pretty standard way of diagnosing this..

All help appreciated.

Mark

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