Received: from localhost (unknown [200.46.204.183]) by postgresql.org (Postfix) with ESMTP id 5930565013E for ; Thu, 4 Sep 2008 22:54:56 -0300 (ADT) Received: from postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 51510-07 for ; Thu, 4 Sep 2008 22:54:53 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.152]) by postgresql.org (Postfix) with ESMTP id 4DDE3650138 for ; Thu, 4 Sep 2008 22:54:53 -0300 (ADT) Received: by fg-out-1718.google.com with SMTP id 16so647267fgg.23 for ; Thu, 04 Sep 2008 18:54:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:cc:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:references; bh=m+9W61SFAeVHQpDi62fhDcsXbHqDJ8YhDI/BA+Nk4UI=; b=LKQdqATrqYtwmROUleUxPlUkWJcdHiyplJM70n/959Kg8/UnQeKQxBYxSN6Z+ufdKa veauZ9wAa4+VYuWFIje9BCwLKwmuVfpTY5b46iD4OL7XaUF+94SsFFlyu8EIA0YEuIhf TdTcRA4gVlFSpwYa61dyNLefQbCnScQSx9NrY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=vDKDCMhgKXTjtnMwQsM4KaYjqhexO/EJkuAu9O/PqZqDrP+OvMlbY4Fhv46YBky+9J WIKjaOIpI/Uhn0bIA+1wiHpiHWDWauLx11GkxTB8OtmRI3I0eZ6k68y98K0kMr6TDr17 NiLRKeXP+DCpUmtfPLP7zRi/0h5Cn2rHDXEqY= Received: by 10.187.219.6 with SMTP id w6mr2514909faq.29.1220579691107; Thu, 04 Sep 2008 18:54:51 -0700 (PDT) Received: by 10.187.225.11 with HTTP; Thu, 4 Sep 2008 18:54:51 -0700 (PDT) Message-ID: <34d269d40809041854g355a8f68ga3a037a69e3d9fcb@mail.gmail.com> Date: Thu, 4 Sep 2008 19:54:51 -0600 From: "Alex Hunsaker" To: "Tom Lane" Subject: Re: hash index improving v3 Cc: "Zdenek Kotala" , "Xiao Meng" , pgsql-patches@postgresql.org, "Jonah H. Harris" In-Reply-To: <11525.1220579153@sss.pgh.pa.us> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <48BFDA8D.3080506@sun.com> <29987.1220560114@sss.pgh.pa.us> <7627.1220569888@sss.pgh.pa.us> <34d269d40809041742r6a0703dbgfbdd012f7f19de2e@mail.gmail.com> <10995.1220577198@sss.pgh.pa.us> <11525.1220579153@sss.pgh.pa.us> X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200809/47 X-Sequence-Number: 7062 On Thu, Sep 4, 2008 at 7:45 PM, Tom Lane wrote: > So what we need for testing is a few different key values that hash to > the same code. Not sure about an easy way to find such. Hrm, well I have not really looked at the hash algorithm but I assume we could just reduce the number of buckets?