| From: | Venkata Balaji N <nag1010(at)gmail(dot)com> |
|---|---|
| To: | Andreas Joseph Krogh <andreas(at)visena(dot)com> |
| Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Where does vacuum FULL write temp-files? |
| Date: | 2015-04-15 02:34:31 |
| Message-ID: | CAEyp7J9D3QhKXudpdjEL9+vWMNA4wBLY6HrP3d3BWQ6_XstzRw@mail.gmail.com |
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| Lists: | pgsql-general |
> I'm planning to vacuum FULL a pg_largeobject relation (after vacuumlo'ing
> it). The relation is 300GB large so I'm concerned the operation will write
> full my pg_xlog directory which is on a 200GB (net) RAID1 SSD.
>
> Where does vacuum FULL rewrite to, does it use pg_xlog or some other
> directory?
>
>
Which version of PostgreSQL is this ?
If i got your question correctly, VACUUM FULL would rewrite the data to a
new data file associated with that particular relation (Table) in the
"$PGDATA/base" directory. This needs an extra disk space at the OS level
(this is not related to pg_xlog directory).
As VACUUMING is a data change operation, "pg_xlog" will also have only the
WAL data (modifications) written at the time of VACUUMING.
http://www.postgresql.org/docs/9.4/static/sql-vacuum.html
Regards,
Venkata Balaji N
Fujitsu Australia
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