what about firing a
DELETE FROM qc_session S
WHERE EXISTS (SELECT *
FROM item_qc_doer i
WHERE i.item_id = s.item_id);
and
DELETE FROM item_qc_doer S
WHERE EXISTS (SELECT *
FROM item_qc_doer i
WHERE i.item_id = s.item_id);
this might be faster.
another way to speed up deletes might be disabling foreign keys.
also a SET ENABLE_SEQSCAN=FALSE; can speed up queries (force use of indices for
access)
do you have a EXPLAIN for us ? do you have a index on item_id on your tables ?
questions by questions ;-)
mfg
-----Ursprüngliche Nachricht-----
Von: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Auftrag von Christian
Paul B. Cosinas
Gesendet: Donnerstag, 20. Oktober 2005 10:44
An: pgsql-performance@postgresql.org
Betreff: [PERFORM] Deleting Records
Hi!
I'm experiencing a very slow deletion of records. Which I thin is not right.
I have a Dual Xeon Server with 6gig Memory.
I am only deleting about 22,000 records but it took me more than 1 hour to
finish this.
What could possibly I do so that I can make this fast?
Here is the code inside my function:
FOR temp_rec IN SELECT * FROM item_qc_doer LOOP
DELETE FROM qc_session WHERE item_id = temp_rec.item_id;
DELETE FROM item_qc_doer WHERE item_id = temp_rec.item_id;
END LOOP;
Item_qc_oder table contains 22,000 records.
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