Re: Replication Syatem

Gauri Kanekar wrote:
> Andrew,
>
> Can you explain me in detail why u said vacuum full is making the things
> worst.
> We do vacuum full, as vacuum verbose analyse dont regain space for us.
>

vacuum full stops all access so that the data files can be re-writen
without the unused space.

normal vacuum will update the records of what space is no longer used so
that it can then be reused with the next update/insert. Your db size
will not shrink straight away but it will stop growing until you use all
the free space left from previous update/delete

The more frequently you do a normal vacuum the less time it will take
and things will run a lot smoother with your file size growing slowly to
accommodate new data.

Expanding on what others have mentioned as a drawback of vacuum full -
you should look at REINDEX'ing as well (maybe one index or table at a
time). You will most likely find this will reclaim some disk space for
you as well.

--

Shane Ambler
pgSQL (at) Sheeky (dot) Biz

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