For temporary tables; truncate vs on commit delete all - Mailing list pgsql-general

From Jim Vanns
Subject For temporary tables; truncate vs on commit delete all
Date
Msg-id CAH7vdhOJLi9eSr_i0KkEG60prha=y=VjY7KvMOa-p3WUwTZUTg@mail.gmail.com
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Responses Re: For temporary tables; truncate vs on commit delete all
List pgsql-general
Does anyone have any idea which is generally better (by better I mean
most efficient/quickest!) in this simple scenario? I have a temporary
table which I wish to retain for the duration of a long-running
session. However, for each transaction it must be purged. So, is it
better to;

a) Always CREATE TEMPORARY TABLE + ON COMMIT DROP for every transaction or;
b) TRUNCATE TABLE or;
c) ON COMMIT DELETE ROWS

Both b & c avoid re-creating the table each time but at the cost of an
explicit purge of some form.
I would assume that despite its name, the latter, example c, is more
akin to a truncation? Or does it actually perform a deletion?

Cheers

Jim

-- 
Jim Vanns
Principal Production Engineer
Industrial Light & Magic, London



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