Received: from maia.hub.org (maia-2.hub.org [200.46.204.251]) by mail.postgresql.org (Postfix) with ESMTP id 5A0BC13364DE for ; Tue, 28 Dec 2010 10:57:25 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.251]) (amavisd-maia, port 10024) with ESMTP id 92191-01 for ; Tue, 28 Dec 2010 14:57:18 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mx01.bfk.de (mx01.bfk.de [193.227.124.2]) by mail.postgresql.org (Postfix) with ESMTP id A624D133616B for ; Tue, 28 Dec 2010 10:57:17 -0400 (AST) Received: from mx00.int.bfk.de ([10.119.110.2]) by mx01.bfk.de with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) id 1PXazC-0007s7-Rl; Tue, 28 Dec 2010 14:57:14 +0000 Received: by bfk.de with local id 1PXazC-0000g7-NS; Tue, 28 Dec 2010 14:57:14 +0000 To: kakarukeys Cc: pgsql-performance@postgresql.org Subject: Re: adding foreign key constraint locks up table References: <75218696-61be-4730-89f6-dd6058fa9eda@a28g2000prb.googlegroups.com> From: Florian Weimer Date: Tue, 28 Dec 2010 14:57:14 +0000 In-Reply-To: <75218696-61be-4730-89f6-dd6058fa9eda@a28g2000prb.googlegroups.com> (kakarukeys@gmail.com's message of "Mon\, 27 Dec 2010 23\:08\:45 -0800 \(PST\)") Message-ID: <82ei926j3p.fsf@mid.bfk.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.91 tagged_above=-10 required=5 tests=BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01 X-Spam-Level: X-Archive-Number: 201012/320 X-Sequence-Number: 41772 > Whenever I try to create a new table "bbb" with foreign key pointing > to "aaa". The operation locks, and reading "aaa" is not possible. The > query also never seems to finish. Do you mean that the ALTER query and subsequent queries are shown as "waiting" in pg_stat_activity? In this case, I'm also wondering why this is inecessary. --=20 Florian Weimer BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstra=DFe 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99