The Slow Query Log
The
slow query log contains a record of
all SQL commands that took longer than the time specified in the
system variable
long_query_time
. This log can help identify problem
queries and expose parts of your database or application that need
tuning.
You can enable the slow query log with the
--log-slow-queries=filename
option. If no filename is provided, it
defaults to hostname-slow.log. If no directory
is given, the directory defaults to the data directory. The
long_query_time variable can be set using the
--set-variable long_query_time=time
command-line option (in which time is specified
in seconds).
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