Error Log Mysql
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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 https://dev.mysql.com/doc/refman/5.5/en/error-log.html 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 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 http://stackoverflow.com/questions/5441972/how-to-see-log-files-in-mysql 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 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
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 http://ronaldbradford.com/blog/monitoring-mysql-the-error-log-2009-09-16/ 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 https://www3.physnet.uni-hamburg.de/physnet/mysql/manual_Log_files.html 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. error log 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 mysql error log 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-error=/var/log/mysql/error.log [mysqld] log-error=/var/log/mysql/error.log In MySQL 5.1 you have the luxury of different output sources, FILE, TABLE or BOTH for the general log and the slow log with -log-output. No option exists for the err
or stopping mysqld. The isam log Logs all changes to the ISAM tables. Used only for debugging the isam code. The query log Established connections and executed queries. The update log Deprecated: Stores all statements that changes data The binary log Stores all statements that changes something. Used also for replication The slow log Stores all queries that took more than long_query_time to execute or didn't use indexes. All logs can be found in the mysqld data directory. You can force mysqld to reopen the log files (or in some cases switch to a new log) by executing FLUSH LOGS. See section 7.26 FLUSH Syntax. 23.1 The Error Log mysqld writes all errors to the stderr, which the safe_mysqld script redirects to a file called 'hostname'.err. (On Windows, mysqld writes this directly to `\mysql\data\mysql.err'). This contains information indicating when mysqld was started and stopped and also any critical errors found when running. If mysqld dies unexpectedly and safe_mysqld needs to restart mysqld, safe_mysqld will write a restarted mysqld row in this file. This log also holds a warning if mysqld notices a table that needs to be automatically checked or repaired. On some operating systems, the error log will contain a stack trace for where mysqld died. This can be used to find out where mysqld died. See section I.1.4 Using a stack trace. 23.2 The Query Log If you want to know what happens within mysqld, you should start it with --log[=file]. This will log all connections and queries to the log file (by default named `'hostname'.log'). This log can be very useful when you suspect an error in a client and want to know exactly what mysqld thought the client sent to it. By default, the mysql.server script starts the MySQL server with the -l option. If you need better performance when you start using MySQL in a production environment, you can remove the -l option from mysql.server or change it to --log-binary. The entries in this log are written as mysqld receives the questions. This may be different than the order in which the statements are executed. This is in contrast to the update log and the binary log which are written after the query is executed, but before any locks are released. 23.3 The Update Log NOTE: The update log is replaced by the binary log. See section 23.4 The Binary Log. With this you can do anything that you can do with the update log. When started with the --log-update[=file_name] option, mysqld writes a log f