Hello All,
TL> If you're deleting very many but not all rows, people tend
TL> to drop the FK constraints and re-establish them afterwards.
I find
BEGIN;
CREATE TEMP TABLE remnant AS
SELECT * FROM bigtable WHERE (very_restrictive_condition);
TRUNCATE TABLE bigtable;
INSERT INTO bigtable SELECT * FROM remnant;
COMMIT;
ANALYSE bigtable;
works well because there is no possibility of my forgetting FKs.
--
Sincerely,
Andrew Lazarus mailto:andrew@xxxxxxxxxxxx
BEGIN:VCARD
VERSION:2.1
N:Lazarus;Andrew;;;Ph.D.
FN:Andrew Lazarus, Ph.D.
EMAIL;PREF;INTERNET:andrew@xxxxxxxxxxxx
TITLE:Director of R&D
ADR;WORK:;800-366-0688;3028 Fillmore Street;San Francisco;CA;94123;USA
LABEL;WORK;ENCODING=QUOTED-PRINTABLE:800-366-0688=0D=0A3028 Fillmore S=
treet=0D=0ASan Francisco=0D=0ACA=0D=0A94123=0D=0AUSA
X-GENDER:Male
REV:18991230T080000Z
END:VCARD
--
Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance
