I am having ~900 slow_queries in mysql. How to debug?

Hi,

I am using the check_mysqld Nagios plugin to monitor slow_queries, and my Piwik server have about 900 slow_queries. style_emoticons/<#EMO_DIR#>/mellow.gif

Does anyone know how I can debug this problem and find the course of it?

E.g. are there a recommended

my.cnf

to use with Linux?

Best regards
Martin