Re: Auto Vacuum question?

On Mon, Jun 04, 2007 at 04:15:12AM -0700, ivan.hou@msa.hinet.net wrote:
> after i executed the command " vaccumdb -f -z testdb", but the size
> just decreased 1 or 2MB...
> what's the problem?

vacuumdb -f does a FULL vacuum, which is blocking and compacts the
tables.  If it only compacted 1 or 2 M, then there are two
possibilities:

1.    You really do have that much data.  You haven't told us
anything about the data, what it looks like, how wide the tables are,
whether you have large objects &c., whether the character set is
multibyte. . .

2.    You have at least one long-running transaction that is
perhaps doing nothing, but that is preventing VACUUM from recovering
space.  What does ps -auxww | grep postgres (or something equivalant)
show you?

A

--
Andrew Sullivan  | ajs@crankycanuck.ca
Users never remark, "Wow, this software may be buggy and hard
to use, but at least there is a lot of code underneath."
        --Damien Katz