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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and http://stackoverflow.com/questions/9871718/how-can-i-start-and-check-my-mysql-log policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags https://www3.physnet.uni-hamburg.de/physnet/mysql/manual_Log_files.html Users Badges Ask 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 error log takes a minute: Sign up How can I start and check my MySQL log? up vote 17 down vote favorite 5 I want to check the log in MySQL to see the queries that are being run by my application. How can I do this? I am using XAMPP and the directory to MySQL is C:\xampp\mysql. This is what I get mysql error logs when I do show variables like '%log%'; mysql> show variables like '%log%'; +---------------------------------+------------------------------------+ | Variable_name | Value | +---------------------------------+------------------------------------+ | back_log | 50 | | binlog_cache_size | 32768 | | binlog_format | STATEMENT | | expire_logs_days | 0 | | general_log | OFF | | general_log_file | C:/xampp/mysql/data/mysql.log | | innodb_flush_log_at_trx_commit | 1 | | innodb_locks_unsafe_for_binlog | OFF | | innodb_log_buffer_size | 8388608 | | innodb_log_file_size | 5242880 | | innodb_log_files_in_group | 2 | | innodb_log_group_home_dir | C:\xampp\mysql\data\ | | innodb_mirrored_log_groups | 1 | | log | OFF | | log_bin | OFF | | log_bin_trust_function_creators | OFF | | log_bin_trust_routine_creators | OFF | | log_error | C:\xampp\mysql\data\mysql.err | | log_output | FILE | | log_queries_not_using_indexes | OFF | | log_slave_updates | OFF | | log_slow_queries | OFF | | log_warnings | 1 | | max_binlog_cache_size | 4294963200 | | max_binlog_size | 1073741824 | | max_relay_log_size | 0 | | relay_log | | | relay_log_index | | | relay_log_info_file | relay-log.info | | relay_log_purge | ON | | relay_log_space_limit | 0 | | slow_query_log | OFF | | slow_query_log_file | C:/xampp/
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