EXPLAIN in the Slow Query Log
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Starting from MariaDB 10.0.4, it is possible to have EXPLAIN output printed in the slow query log.
Switching it on
EXPLAIN can be switched on by specifying "explain" keyword in the log_slow_verbosity system variable. Alternatively, you can specify in the log-slow-verbosity command line argument.
[mysqld] log-slow-verbosity=query_plan,explain
How it looks like
When explain printing is on, slow query log entries look like this:
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