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What's the safest way to truncate the MySQL slow query log (under Linux primarily, but Windows would be handy to know) while MySQL is running?
By safe I mean:
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The following is the best process for collecting and aggregating the top queries: Set long_query_time = 0 (in some cases, you may need to rate limit to not flood the log) Enable the slow log and collect for some time (slow_query_log = 1) Stop collection and process the log with pt-query-digest.
To disable or enable the slow query log or change the log file name at runtime, use the global slow_query_log and slow_query_log_file system variables. Set slow_query_log to 0 to disable the log or to 1 to enable it.
The MySQL slow query log is where the MySQL database server registers all queries that exceed a given threshold of execution time. This can often be a good starting place to see which queries are slowest and how often they are slow. MySQL on your server is configured to log all queries taking longer than 0.1 seconds.
By default, the slow query log file is located at /var/lib/mysql/hostname-slow. log. We can also set up another location as shown in listing 03 using the slow_query_log_file parameter.
To truncate a file regardless if it is open by a running application do:
> /var/logs/your.log
at your shell prompt.
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