On Fri, Feb 17, 2017 at 1:38 PM, Rakesh Kumar <rakeshkumar464@xxxxxxxxxxx> wrote: > LOCK TABLE yourtable <a suitable LOCKMODE>; > CREATE TEMPORARY TABLE keep AS SELECT * FROM yourtable WHERE <keep>; > TRUNCATE yourtable; > INSERT INTO yourtable SELECT * from keep; > COMMIT; > === > the above snippet assumes truncate in PG can be in a transaction. In other words, while truncate by itself > is atomic, it can't be rolled back. So in the above case, if "INSERT INTO yourtable SELECT * from keep;" and > we rollback, will it rollback yourtable. Yes it can. Truncate has been rollbackable for a while now. begin; create table insert into table truncate old table . something goes wrong . rollback; Unless I misunderstand your meaning. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
