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What happens to the slow query log in MySQL?
If the destination is NONE, the server writes no queries even if the slow query log is enabled. Setting the log file name has no effect on logging if FILE is not selected as an output destination.
How to select general query and slow query?
To write general and slow query log entries only to the log tables, use –log_output=TABLE to select tables as the log destination and –general_log and –slow_query_log to enable both logs.
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.
What are the destinations of MySQL general query log?
/ MySQL Server provides flexible control over the destination of output written to the general query log and the slow query log, if those logs are enabled. Possible destinations for log entries are log files or the general_log and slow_log tables in the mysql system database.
How do I delete a log file in MySQL?
Remove / Move the log file to another directory. Create a new log file with the same name. Start the mysql service. Make sure, you have rights to move/remove the log file. You cannot delete the file, when mysql service is accessing the log file.
Can a file name affect the slow query log?
Setting the log file name has no effect on logging if FILE is not selected as an output destination. If the slow query log is enabled and FILE is selected as an output destination, each statement written to the log is preceded by a line that begins with a # character and has these fields (with all fields on a single line):
Is there a way to find long running queries in MySQL?
Another valuable tool in MySQL is the included slow query logging feature. This feature is the preferred method for finding long-running queries regularly. There are several directives available to adjust this feature. However, the most commonly needed settings are:
Are there any performance issues with MySQL database?
Performance issues are common problems when administering MySQL databases. Sometimes these problems are, in fact, due to slow queries. In this blog, we’ll deal with slow queries and how to identify these. MySQL has the capability to filter and log slow queries.