Activate Mysql Error Log
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173,587 mysql mariadb log performance databases memcached sysadmin Debian how-to Share: Tweet Image source: Blue and pink dolphins at work If you are a web mysql enable error log runtime developer, you need to refer to various log files, in order to debug your mysql error logs location windows application or improve its performance. Logs is the best place to start troubleshooting. Concerning the famous MySQL database server (or MariaDB mysql error logs centos server), you need to refer to the following log files: The Error Log. It contains information about errors that occur while the server is running (also server start and stop) The General Query Log. mysql error logs ubuntu 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). This article does not refer to The Binary Log. This requires very high standards server hardware and is useful only in special cases (e.g. replication, master - slaves setup, certain data recovery operations). Οtherwise, it is just a "performance killer". The
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official documentation about MySQL logs is available here. Enable logs from MySQL configuration Logging parameters are located under [mysqld] section. Edit MySQL configuration file: nano /etc/mysql/my.cnf This is the default setup for Logging and Replication (in Debian server). In other distributions the structure may be different, but you can always use MySQL server parameters: # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 # # Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf. # # Here you can see queries with especially long duration #log_slow_queries = /var/log/mysql/mysql-slow.log #long_query_time = 2 #log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name All log files are NOT enabled by default MySQL setup (except the error log on Windows). Default Debian setup sends Error log to syslog. The other
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Server Administration The MySQL Server Configuring the Server Server Configuration Defaults Server Option mysql error logs location linux and Variable Reference Server Command Options Server System Variables Using System Variables Structured System Variables Dynamic System Variables Server where are mysql log files 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 http://www.pontikis.net/blog/how-and-when-to-enable-mysql-logs Addresses Obtaining an IPv6 Address from a Broker Server-Side Help Server Response to Signals 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 http://dev.mysql.com/doc/mysql/en/error-log.html 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 The Rewriter Query Rewrite Plugin Installing or uninstalling the Rewriter Query Rewrite Plugin Using the Rewriter Query Rewrite Plugin Rewriter Query Rewrite Plugin Reference Version Tokens Version Tokens Components Installing or Uninstalling Version Tokens Using Version Tokens Version Tokens Reference 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 Probe Reference Connection Probes Command Probes Query Probes Query Parsing Probes Query Cache Probes Query Execution Probes Row-Level Probes Read Row Probes Index Probes Lock Probes Filesort Probes Statement Probes Network Probes Keycache Probes Security Backup and Recovery Optimization Language Structure Globalization Data Types Functions and Operators SQL Statement Syntax The InnoDB Storage Engine Alternative Storage Eng
Connectors More MySQL.com Downloads Developer Zone Section Menu: Documentation Home MySQL 5.5 Reference Manual Preface and Legal Notices General Information Installing and Upgrading MySQL Tutorial MySQL Programs MySQL Server Administration The MySQL https://dev.mysql.com/doc/refman/5.5/en/error-log.html Server Configuring the Server Server Configuration Defaults Server Option and Variable Reference https://dev.mysql.com/doc/refman/5.6/en/query-log.html Server Command Options Server System Variables Using System Variables Structured System Variables Dynamic 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 error log an IPv6 Address from a Broker Server-Side Help Server Response to Signals 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 error log 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 Probe Reference Connection Probes Command Probes Query Probes Query Parsing Probes Query Cache Probes Query Execution Probes Row-Level Probes Read Row Probes Index Probes Lock Probes Filesort Probes Statement Probes Network Probes Keycache Probes Security Backup and Recovery Optimization Language Structure Globalization Data Types Functions and Operators SQL Statement Syntax The InnoDB Storage Engine Alternative Storage Engines High Availability and Scalability Replication MySQL Cluster NDB 7.2 Partitioning Stored Programs and Views INFORMATION_SCHEMA Tables MySQL Performance Schema Connectors and APIs Extending MySQL MySQL Enterprise Edition MySQL Workbench MySQL 5.5 Frequently Ask
Connectors More MySQL.com Downloads Developer Zone Section Menu: Documentation Home MySQL 5.6 Reference Manual Preface and Legal Notices General Information Installing and Upgrading MySQL Tutorial MySQL Programs MySQL Server Administration The MySQL Server Configuring the Server Server Configuration Defaults Changes to Server Defaults 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 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 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 Probe Reference Connection Probes Command Probes Query Probes Query Parsing Probes Query Cache Probes Query Execution Probes Row-Level Probes Read Row Probes Index Probes Lock Probes Fileso