Re: Where does vacuum FULL write temp-files?

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От Venkata Balaji N
Тема Re: Where does vacuum FULL write temp-files?
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Msg-id CAEyp7J9D3QhKXudpdjEL9+vWMNA4wBLY6HrP3d3BWQ6_XstzRw@mail.gmail.com
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Ответ на Where does vacuum FULL write temp-files?  (Andreas Joseph Krogh <andreas@visena.com>)
Ответы Re: Where does vacuum FULL write temp-files?  (Andreas Joseph Krogh <andreas@visena.com>)
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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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