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 3D17311F603C for ; Mon, 3 Apr 2006 01:20:08 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 17919-04 for ; Mon, 3 Apr 2006 01:20:06 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from mail.clickspace.com (router2.clickspace.com [65.110.166.227]) by postgresql.org (Postfix) with ESMTP id A600111F6006 for ; Mon, 3 Apr 2006 01:20:05 -0300 (ADT) Received: from [10.0.1.4] ([68.147.204.179]) (authenticated user brendan@clickspace.com) by mail.clickspace.com (using TLSv1/SSLv3 with cipher RC4-SHA (128 bits)); Sun, 2 Apr 2006 22:20:04 -0600 In-Reply-To: <200604021530.55251.josh@agliodbs.com> References: <2F1712F1-E5E2-455E-A291-06F300A66549@clickspace.com> <200603292118.50033.josh@agliodbs.com> <200604021530.55251.josh@agliodbs.com> Mime-Version: 1.0 (Apple Message framework v749.3) Content-Type: multipart/signed; micalg=sha1; boundary=Apple-Mail-3-374559521; protocol="application/pkcs7-signature" Message-Id: Cc: pgsql-performance@postgresql.org From: Brendan Duddridge Subject: Re: Query using SeqScan instead of IndexScan Date: Sun, 2 Apr 2006 22:20:00 -0600 To: Josh Berkus X-Mailer: Apple Mail (2.749.3) X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.111 required=5 tests=[AWL=0.111] X-Spam-Score: 0.111 X-Spam-Level: X-Archive-Number: 200604/18 X-Sequence-Number: 18102 --Apple-Mail-3-374559521 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Hi Josh, Thanks. I've adjusted my effective_cache_size to 5 GB, so we'll see how that goes. I'm also doing some query and de-normalization optimizations so we'll see how those go too. ____________________________________________________________________ Brendan Duddridge | CTO | 403-277-5591 x24 | brendan@clickspace.com ClickSpace Interactive Inc. Suite L100, 239 - 10th Ave. SE Calgary, AB T2G 0V9 http://www.clickspace.com On Apr 2, 2006, at 4:30 PM, Josh Berkus wrote: > Brendan, > >> But just as a follow up question to your #1 suggestion, I have 8 GB >> of ram in my production server. You're saying to set the >> effective_cache_size then to 5 GB roughly? Somewhere around 655360? >> Currently it is set to 65535. Is that something that's OS dependent? >> I'm not sure how much memory my server sets aside for disk caching. > > Yes, about. It's really a judgement call; you're looking for the > approximate > combined RAM available for disk caching and shared mem. However, > this is > just used as a way of estimating the probability that the data you > want is > cached in memory, so you're just trying to be order-of-magnitude > accurate, > not to-the-MB accurate. > > -- > Josh Berkus > Aglio Database Solutions > San Francisco > > ---------------------------(end of > broadcast)--------------------------- > TIP 4: Have you searched our list archives? > > http://archives.postgresql.org > --Apple-Mail-3-374559521 Content-Transfer-Encoding: base64 Content-Type: application/pkcs7-signature; name=smime.p7s Content-Disposition: attachment; filename=smime.p7s MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIGIDCCAtkw ggJCoAMCAQICAw84ujANBgkqhkiG9w0BAQQFADBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhh d3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVt YWlsIElzc3VpbmcgQ0EwHhcNMDUwNzI5MjAxMTQzWhcNMDYwNzI5MjAxMTQzWjBIMR8wHQYDVQQD ExZUaGF3dGUgRnJlZW1haWwgTWVtYmVyMSUwIwYJKoZIhvcNAQkBFhZicmVuZGFuQGNsaWNrc3Bh Y2UuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqWfMCdFgKzXroGNqJuU3eyDC K/Gxts3mtmIdgcHGmUjRKdlBSfkmcCBUDPJIt4QQc91sY3h8Itg0EAsF+1yFECU6afn/1SEAHSDK 6Q86PclF58/Dux2FYNGpeIAw/lisZ2UCyIYoUiWtEDKCBq5jDuYzcGkFS5Csz+/rEL+BHTXQVqnS nUdUaXu9xdZn4wgjB/n65UEYRqr0LGN53CGsFcA9uC+ViS7WyBtzJcP02LMNT+cAZ7TKHw4Q/ZeG 5ptPgQHLTD2wza3GMbPQ4fYK6aNPA+lVzslLSCjyQpg55gVyQQlV0k/5zU5Q5m48ZtqwOqN+fPYd eIB7H5y1SFLd/wIDAQABozMwMTAhBgNVHREEGjAYgRZicmVuZGFuQGNsaWNrc3BhY2UuY29tMAwG A1UdEwEB/wQCMAAwDQYJKoZIhvcNAQEEBQADgYEAT+6hGvStHoRO0OCHlJev31BpUlvPSpbYVKJN i5kCMF164sSX7j0IRvcyU6DfUuW7samTluXJbANyuX1ZIpXulGen5EEc2NV7eU/rMz6ExklMShTh ++azcvmMjOzTuqXi3ZsIjwzBBhqCB0U++kYlMlHEYla2qKLFbXY6PiH0a8swggM/MIICqKADAgEC AgENMA0GCSqGSIb3DQEBBQUAMIHRMQswCQYDVQQGEwJaQTEVMBMGA1UECBMMV2VzdGVybiBDYXBl MRIwEAYDVQQHEwlDYXBlIFRvd24xGjAYBgNVBAoTEVRoYXd0ZSBDb25zdWx0aW5nMSgwJgYDVQQL Ex9DZXJ0aWZpY2F0aW9uIFNlcnZpY2VzIERpdmlzaW9uMSQwIgYDVQQDExtUaGF3dGUgUGVyc29u YWwgRnJlZW1haWwgQ0ExKzApBgkqhkiG9w0BCQEWHHBlcnNvbmFsLWZyZWVtYWlsQHRoYXd0ZS5j b20wHhcNMDMwNzE3MDAwMDAwWhcNMTMwNzE2MjM1OTU5WjBiMQswCQYDVQQGEwJaQTElMCMGA1UE ChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFs IEZyZWVtYWlsIElzc3VpbmcgQ0EwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAMSmPFVzVftO ucqZWh5owHUEcJ3f6f+jHuy9zfVb8hp2vX8MOmHyv1HOAdTlUAow1wJjWiyJFXCO3cnwK4Vaqj9x VsuvPAsH5/EfkTYkKhPPK9Xzgnc9A74r/rsYPge/QIACZNenprufZdHFKlSFD0gEf6e20TxhBEAe ZBlyYLf7AgMBAAGjgZQwgZEwEgYDVR0TAQH/BAgwBgEB/wIBADBDBgNVHR8EPDA6MDigNqA0hjJo dHRwOi8vY3JsLnRoYXd0ZS5jb20vVGhhd3RlUGVyc29uYWxGcmVlbWFpbENBLmNybDALBgNVHQ8E BAMCAQYwKQYDVR0RBCIwIKQeMBwxGjAYBgNVBAMTEVByaXZhdGVMYWJlbDItMTM4MA0GCSqGSIb3 DQEBBQUAA4GBAEiM0VCD6gsuzA2jZqxnD3+vrL7CF6FDlpSdf0whuPg2H6otnzYvwPQcUCCTcDz9 reFhYsPZOhl+hLGZGwDFGguCdJ4lUJRix9sncVcljd2pnDmOjCBPZV+V2vf3h9bGCE6u9uo05RAa WzVNd+NWIXiC3CEZNd4ksdMdRv9dX2VPMYIC5zCCAuMCAQEwaTBiMQswCQYDVQQGEwJaQTElMCMG A1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNv bmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECAw84ujAJBgUrDgMCGgUAoIIBUzAYBgkqhkiG9w0BCQMx CwYJKoZIhvcNAQcBMBwGCSqGSIb3DQEJBTEPFw0wNjA0MDMwNDIwMDBaMCMGCSqGSIb3DQEJBDEW BBQQ5rrFzGdyBsXH2zeRYgZreZshCzB4BgkrBgEEAYI3EAQxazBpMGIxCzAJBgNVBAYTAlpBMSUw IwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVy c29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIDDzi6MHoGCyqGSIb3DQEJEAILMWugaTBiMQswCQYD VQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMj VGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECAw84ujANBgkqhkiG9w0BAQEFAASC AQBU4mDIh04Sob1vYa+mxjP0LDZW9+rH3gkiZkNlyVa2fKK34/Ik0HsGJOaF6fkrxqIxliJRj17j rHAZj/FD8bqK/Eo9DwKWx4Naphl6IcnlQELWrtETWiqdTSjGTziRxp70oIp1priNVzuiweNExD+D +KKV5RbjgyFKt1LdfiNRmPhKg07yi0MX/i00WrWh+uEeS5m0RMrvB4YgQ/D0RSH4JG3SpWt5z0vI SWQUlvBRDEVgXYfwocoNqF9ZdPTPR8kn9QnhuZA/1FMHoZWE7vDFqatcqEPy2rrbUQHC1HLFNmGb LAVB509sFVaIq589qcZLMPLK5OvkS5spk/1VJHs7AAAAAAAA --Apple-Mail-3-374559521--