query and delete records really slow in a table
- From: LegeDoos <legedoos@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 19 Oct 2007 14:28:32 +0200
Hi there!
We have a couple (18) of tables "linked" with foreign keys and
cascading delete. The largest table contains < 1.000.000 records.
When deleting a record from the top level table, this is extremely
slow (like waiting a couple of minutes). On another database (on the
same server and on another server) deleting is fast (<1sec). Tables
contain defferent data.
-There are no blocking locks
-rebuilding the indexes didn't help
-the explain plan looks ok and is the same for the different databases
0 DELETE STATEMENT optimizer=ALL_ROWS (cost=460 card=1 bytes=73)
1 0 DELETE of 'OST_STUDENT_STUDIEVOORTGANG'
2 1 HASH JOIN (SEMI) (cost=460 card=1 bytes=73)
3 2 TABLE ACCESS (FULL) of 'OST_STUDENT_STUDIEVOORTGANG' TABLE
(cost=57 card=31859 bytes=1146924)
4 2 TABLE ACCESS (FULL) of 'OST_STUDENT_EXAMEN' TABLE
(cost=199
card=55431 bytes=2050947)
-I moved all tables en indexes to another tablespace, didn't help
-There are no errors in the alert.log.
Can anybody help?
Thanks!
Rob
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