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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Delete slowing..
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
Mark Leith | T: +44 (0)1905 330 281
Sales & Marketing | F: +44 (0)870 127 5283
Cool Tools UK Ltd | E: mark_at_cool-tools.co.uk
===================================================
http://www.cool-tools.co.uk
Maximising throughput & performance
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Author: Ron Thomas
INET: rthomas_at_hypercom.com
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Liststo: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Tue Nov 27 2001 - 15:40:53 CST
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