From owner-freebsd-questions@FreeBSD.ORG Wed Aug 2 13:03:14 2006 Return-Path: X-Original-To: questions@freebsd.org Delivered-To: freebsd-questions@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C73EC16A4DD for ; Wed, 2 Aug 2006 13:03:14 +0000 (UTC) (envelope-from remorse@partners.org) Received: from phsmgmx3.partners.org (phsmgmx3.partners.org [155.52.251.34]) by mx1.FreeBSD.org (Postfix) with ESMTP id 67E2D43D45 for ; Wed, 2 Aug 2006 13:03:14 +0000 (GMT) (envelope-from remorse@partners.org) Received: from phsmgmx3.partners.org (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 9BCD544820F; Wed, 2 Aug 2006 09:03:13 -0400 (EDT) Received: from hedwig.mgh.harvard.edu (hedwig.mgh.harvard.edu [132.183.156.18]) by phsmgmx3.partners.org (Postfix) with ESMTP id 8C0D44481C6; Wed, 2 Aug 2006 09:03:12 -0400 (EDT) Received: from [132.183.156.105] (buxtehude.mgh.harvard.edu [132.183.156.105]) by hedwig.mgh.harvard.edu (8.13.3/8.13.3) with ESMTP id k72D4aOa069009; Wed, 2 Aug 2006 09:04:36 -0400 (EDT) (envelope-from remorse@partners.org) In-Reply-To: <31F1465C-5B87-4B79-8D58-0A538BF30562@partners.org> References: <31F1465C-5B87-4B79-8D58-0A538BF30562@partners.org> Mime-Version: 1.0 (Apple Message framework v752.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Content-Transfer-Encoding: 7bit From: Richard Morse Date: Wed, 2 Aug 2006 09:03:07 -0400 To: Richard Morse X-Mailer: Apple Mail (2.752.2) Cc: questions@freebsd.org Subject: Re: Problems with MySQL since upgrade X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Aug 2006 13:03:14 -0000 On Aug 1, 2006, at 9:24 AM, Richard Morse wrote: > Hi! I recently updated MySQL to version 5.0.22 using the ports > system (portupgrade -r -R mysql-\*). Previous to this, MySQL was > behaving perfectly normally. Since the upgrade, I have found that > every so often -- sometimes two or three times a day, sometimes > every other day, but no more often than that -- one of the > databases MySQL is hosting starts misbehaving, MySQL starts > climbing in processor usage, and I have to restart MySQL to > recover. By "misbehaving", I mean that some subset of queries to > this database start not returning -- they take forever. By > climbing in processor usage, I mean that my load averages, which > normally sit around 0, start going up to 3, 5, even 7. > > - How can I determine what query it is that is causing this to > happen? I have turned on the log files by adding the following > line to /etc/rc.conf: Hi! Since this time, I have, I think, found what query is causing the problem: SELECT u.*, s.* FROM users u INNER JOIN sessions s ON u.uid = s.uid WHERE s.sid = "d9fe25949f79f2c767a0d237b4fdf841" AND u.status < 3 LIMIT 0, 1 How can I determine _why_ this is causing MySQL to hang/enter some kind of infinite loop? Thanks, Ricky