Received: from maia.hub.org (maia-2.hub.org [200.46.204.251]) by mail.postgresql.org (Postfix) with ESMTP id 91C731337B92 for ; Thu, 25 Nov 2010 08:03:51 -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 04927-08 for ; Thu, 25 Nov 2010 12:03:44 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from lo.gmane.org (lo.gmane.org [80.91.229.12]) by mail.postgresql.org (Postfix) with ESMTP id 417BC1337BA1 for ; Thu, 25 Nov 2010 08:03:43 -0400 (AST) Received: from list by lo.gmane.org with local (Exim 4.69) (envelope-from ) id 1PLaY9-0007uj-Vh for pgsql-performance@postgresql.org; Thu, 25 Nov 2010 13:03:41 +0100 Received: from 217.110.94.67 ([217.110.94.67]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 25 Nov 2010 13:03:41 +0100 Received: from spam_eater by 217.110.94.67 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 25 Nov 2010 13:03:41 +0100 X-Injected-Via-Gmane: http://gmane.org/ To: pgsql-performance@postgresql.org From: Thomas Kellerer Subject: Re: Which gives good performance? separate database vs separate schema Date: Thu, 25 Nov 2010 13:03:29 +0100 Lines: 14 Message-ID: References: <991565.83793.qm@web65414.mail.ac4.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: 217.110.94.67 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.23) Gecko/20090812 Thunderbird/2.0.0.23 Mnenhy/0.7.6.666 In-Reply-To: <991565.83793.qm@web65414.mail.ac4.yahoo.com> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-0.746 tagged_above=-10 required=5 tests=BAYES_00=-1.9, RCVD_NUMERIC_HELO=1.164, T_RP_MATCHES_RCVD=-0.01 X-Spam-Level: X-Archive-Number: 201011/370 X-Sequence-Number: 41394 Divakar Singh, 25.11.2010 12:37: > Hello Friends, > I have many instances of my software running on a server (Solaris SPARC). Each software instance requires some DB tables (same DDL for all instances' tables) to store data. > It essentially means that some processes from each instance of the software connect to these tables. > Now, should I put these tables in 1 Database's different schemas or in separate databases itself for good performance? > I am using libpq for connection. > I don't think it will make a big difference in performance. The real question is: do you need queries that "cross boundaries"? If that is the case you have to use schema, because Postgres does not support cross-database queries. Regards Thomas