On Oct 7, 2013, at 2:48 PM, Guy Rouillier <guy.rouill...@gmail.com> wrote:

> We have a fairly large (1 TB) database we put on all SSDs because of a very 
> high insert and update rate ().  As our business has grown, we've been 
> running into space constraints, so we went looking for files we might be able 
> to delete.
> 
> We found a large number (662 out of 1465 total ) and size (219 GB) of files 
> in the data directory whose name does not correspond to an oid in the 
> pg_class system catalog table.  That amount of space would address our 
> current space constraint problems.  Some of these tables are recent (from 
> today), while others are quite old (large volume in August and May, with some 
> smaller ones as far back as February.

You need to be looking at pg_class.relfilenode, not pg_class.oid. They're often 
the same value, but often not.

Cheers,
  Steve



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