Error Log File In Mysql
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Using a Sample Default Server Configuration File Server Option and Variable Reference Server Command Options Server System Variables Using System Variables Structured System Variables Dynamic http://dev.mysql.com/doc/mysql/en/error-log.html System Variables Server Status Variables Server SQL Modes IPv6 Support Verifying System Support for IPv6 Configuring the MySQL Server to Permit IPv6 Connections Connecting Using the IPv6 Local Host Address Connecting Using IPv6 Nonlocal Host Addresses Obtaining an IPv6 Address from a Broker Server-Side Help Server Response to Signals https://dev.mysql.com/doc/refman/5.6/en/error-log.html The Server Shutdown Process The MySQL Data Directory The mysql System Database MySQL Server Logs Selecting General Query and Slow Query Log Output Destinations The Error Log The General Query Log The Binary Log Binary Logging Formats Setting The Binary Log Format Mixed Binary Logging Format Logging Format for Changes to mysql Database Tables The Slow Query Log The DDL Log Server Log Maintenance MySQL Server Plugins Server Plugins Available Installing and Uninstalling Plugins Obtaining Server Plugin Information MySQL Enterprise Thread Pool Thread Pool Components Thread Pool Installation Thread Pool Operation Thread Pool Tuning Running Multiple MySQL Instances on One Machine Setting Up Multiple Data Directories Running Multiple MySQL Instances on Windows Starting Multiple MySQL Instances at the Windows Command Line Starting Multiple MySQL Instances as Windows Services Running Multiple MySQL Instances on Unix Using Client Programs in a Multiple-Server Environment Tracing mysqld Using DTrace mysqld DTrace
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about http://stackoverflow.com/questions/5441972/how-to-see-log-files-in-mysql hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask http://ronaldbradford.com/blog/monitoring-mysql-the-error-log-2009-09-16/ Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to see log files in MySQL? up vote 69 down vote favorite 28 I've read that Mysql server creates a log file where it keeps a record of all log file activities - like when and what queries execute. Can anybody tell me where it exists in my system? How can I read it? Basically, I need to back up the database with different input [backup between two dates] so I think I need to use log file here, that's why I want to do it... I think this log must be secured somehow because sensitive information such as usernames and password may be logged [if any query require mysql error log this]; so may it be secured, not easily able to be seen? I have root access to the system, how can I see the log? When I try to open /var/log/mysql.log it is empty. This is my config file: [client] port = 3306 socket = /var/run/mysqld/mysqld.sock [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] log = /var/log/mysql/mysql.log binlog-do-db=zero user = mysql socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp skip-external-locking bind-address = 127.0.0.1 # # * Fine Tuning # key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 general_log_file = /var/log/mysql/mysql.log general_log = 1 mysql logging share|improve this question edited Jul 6 at 12:04 kenorb 21.6k8152125 asked Mar 26 '11 at 11:21 Arjun 90211025 add a comment| 8 Answers 8 active oldest votes up vote 33 down vote accepted Here is a simple way to enable them. In mysql we need to see often 3 logs which are mostly needed during any project development. The Error Log. It contains information about errors that occur while the server is running (also server start and stop) The General Query Log. This is a general record of what mysqld is doing (connect, disconnect, queries) The Slow Query Log. Ιt consists of "slow" SQL statements (as indicated by its name). By default no log files are enabled in MYSQL. All errors will be shown in the
Quotes Presentations Experience 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 You are here: Home / Technologies / Databases / Monitoring MySQL - The error logMonitoring MySQL - The error log September 16, 2009 by ronald It is important that you monitor the MySQL error log. There are a few different options available for defining the details of the log. If not specified the default is [datadir]/[hostname].err. This is not an ideal location for 2 reasons. First, a correctly configured MySQL datadir will have permissions only for the mysql user, and this is generally restrictive access to the user only and no group or world permissions. Other users/groups should have limited access to the mysql error log. Second, the datadir is for data, not logs, especially logs that can potentially fill file systems. I am referring here to more then just the error log. I would recommend you create a separate directory for MySQL logs such as the error, slow and general logs. An example I implement for single installation environments using Linux mysql packages is: mkdir /var/log/mysql chown mysql:mysql /var/log/mysql chmod 750 /var/log/mysql There does not seem to be a consensus over whether to include the hostname or not in the error log filename. My preference is to not include. I would rather the filename to be consistent across multiple servers. The argument is what about when consolidating logs from multiple servers. I discount this because you have to connect to the server to retrieve logs, create a sub directory of that hostname for consolidated logs. With Linux distributions you may not find log files where you expect. Ubuntu packages for example has the log going to syslog. While the theory is to make system logging and monitoring easier, it makes MySQL specific monitoring more difficult. You also suffer a logrotate problem where you may only have 7 days of log. I prefer to have access to all historical MySQL log information. The best choice is to define the error log with log-error, in both the [mysqld_safe] and [mysqld] section of your servers my.cnf [mysqld_safe] log-er