Re: Effects of dropping a large table

On 2023-07-23 06:09:03 -0400, Gus Spier wrote:
> Ah! Truncating a table does not entail all of WAL processes. From the
> documentation, "TRUNCATE quickly removes all rows from a set of tables. It has
> the same effect as an unqualified DELETE on each table, but since it does not
> actually scan the tables it is faster. Furthermore, it reclaims disk space
> immediately, rather than requiring a subsequent VACUUM operation. This is most
> useful on large tables." https://www.postgresql.org/docs/14/sql-truncate.html

I assumed that by "deleting the now empty table" you meant DROPing it.
(Performing a «DELETE FROM t» just after a «TRUNCATE t» would obviously
be pointless).

So let me rephrase the question:

What's the advantage of

TRUNCATE t
DROP t

over just

DROP t

hp

--
_ | Peter J. Holzer | Story must make more sense than reality.
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| | | hjp(at)hjp(dot)at | -- Charles Stross, "Creative writing
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