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I have run out of space, because I am new to Postgres and I have just not been monitoring it properly.

Now I cannot even vacuum the tables:

ERROR:  could not extend file "base/20851/11787": No space left on device

I have deleted a whole bunch of data. I realize that only vacuum full will bring back space though.

I have another logical volume with lots of space on it. Can I create some kind of a tablespace over there? If so, is there a specific kind of space to tell the database to do it's "work" over there during the vacuum process? Or do I need to physically move tables to that tablespace? How do I do that?

I apologize for the rapid fire questions. I have found myself in a bit of a spot.

This is PostgreSQL 9.3.

  • Depends on just how full it is. You need space to write WAL records in order to create a tablespace. There are some nasty catch-22 situations around out-of-disk-space issues. – Craig Ringer Sep 15 '14 at 1:18
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Here's what You can do to move your data to the new tablespace :

  1. Create the new tablespace pointing to the new location.

    postgres=# create TABLESPACE movespace LOCATION '/home/postgres_tbsp';
    CREATE TABLESPACE
    
  2. Alter table or database to move to the new tablespace.

    postgres=# ALTER DATABASE slonmaster SET tablespace movespace;
    ALTER DATABASE
    

This process could last long as it moves all the data in the table or database to a new location.

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    ... which will probably run out of disk space due to the need to write WAL for the table move. – Craig Ringer Sep 15 '14 at 1:18
  • I freed up about 3GB by moving older WAL files. That at least let me set the temp_tablespace over to the new tablespace. Now I'm "vacuum full"-ing smaller to successively larger tables to give me the space I need. – AKWF Sep 15 '14 at 1:30
  • From the behavior I'm seeing, it looks like "vacuum full" rebuilds the file on disk in a tmp directory, then rewrites the whole table to a new file and deletes the old file. – AKWF Sep 15 '14 at 1:31
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    @AKWF , yes, the vacuum full rebuild the table You're vacuuming, so it needs free space as big as the table you're vacuuming – Soni Harriz Sep 15 '14 at 8:41

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