X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id BECB79DCD43 for ; Fri, 16 Dec 2005 11:23:19 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 54032-06 for ; Fri, 16 Dec 2005 11:23:23 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id 07B589DCBA1 for ; Fri, 16 Dec 2005 11:23:16 -0400 (AST) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.1/8.13.1) with ESMTP id jBGFNLOV026245; Fri, 16 Dec 2005 10:23:21 -0500 (EST) To: "PostgreSQL" cc: pgsql-performance@postgresql.org Subject: Re: ALTER TABLE SET TABLESPACE and pg_toast In-reply-to: References: Comments: In-reply-to "PostgreSQL" message dated "Fri, 16 Dec 2005 08:25:41 -0600" Date: Fri, 16 Dec 2005 10:23:21 -0500 Message-ID: <26244.1134746601@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.002 required=5 tests=[AWL=0.002] X-Spam-Score: 0.002 X-Spam-Level: X-Archive-Number: 200512/401 X-Sequence-Number: 16222 "PostgreSQL" writes: > We're storing tif images in a table as bytea. We were running low on our > primary space and moved several tables, including the one with the images, > to a second tablespace using ALTER TABLE SET TABLESPACE. > This moved quite cleaned out quite a bit of space on the original > tablespace, but not as much as it should have. It does not appear that the > corresponding pg_toast tables were moved. I think you're mistaken; at least, the SET TABLESPACE code certainly intends to move a table's toast table and index along with the table. What's your evidence for saying it didn't happen, and which PG version are you using exactly? > 2) Also, is there a good way to determine which pg_toast tables are > associated with any particular table and column? pg_class.reltoastrelid and reltoastidxid. See http://www.postgresql.org/docs/8.1/static/storage.html http://www.postgresql.org/docs/8.1/static/catalog-pg-class.html regards, tom lane