How do I start mysql slow query log?
To enable the slow query log, type the following command at the mysql> prompt: SET GLOBAL slow_query_log = ‘ON’; There are additional options that you can set for the slow query log: By default, when the slow query log is enabled, it logs any query that takes longer than 10 seconds to run.
Where is the mysql slow log?
/var/lib/mysql
By default, the slow query log file is located at /var/lib/mysql/hostname-slow. log.
How do I Analyse mysql logs?
In the case of MySQL, one useful method is to analyze the logs….Running the installation script
- General log – /var/log/mysql/mysql. log (use –generallog to override)
- Slow queries log – /var/log/mysql/mysql-slow. log (use –slowlog to override)
- Error log – /var/log/mysql/error. log (use –errorlog to override)
How to disable slow query log in MySQL?
Set slow_query_log to 0 to disable the log or to 1 to enable it. Set slow_query_log_file to specify the name of the log file. If a log file already is open, it is closed and the new file is opened. The server writes less information to the slow query log if you use the –log-short-format option.
How to write slow admin statements in MySQL?
If a log file already is open, it is closed and the new file is opened. The server writes less information to the slow query log if you use the –log-short-format option. To include slow administrative statements in the slow query log, enable the log_slow_admin_statements system variable.
How to specify a slow query log file name?
To specify a log file name, use –slow_query_log_file= file_name . To specify the log destination, use the log_output system variable (as described in Section 5.4.1, “Selecting General Query Log and Slow Query Log Output Destinations” ). If you specify the TABLE log destination, see Log Tables and “Too many open files” Errors .
When to add slow queries to the replica’s slow query log?
Slow queries that are logged in row format when binlog_format=MIXED is set, or that are logged when binlog_format=ROW is set, are not added to the replica’s slow query log, even if log_slow_replica_statements or log_slow_slave_statements is enabled.