First enable logging of slow running queries in "mysqld" section of "my.cnf".
[mysqld]
log_slow_queries=/var/log/mysqld.slow.log
long_query_time=2Once queries get logged, you can get the top 10 queries sorted by number of occurrences in the log via:
mysqldumpslow -s c -t 10 /var/log/mysqld.slow.log