I haven’t been generous enough to spend money on higher RAM for my blogs. I started to notice slow downs in the blog recent, particularly caused by a particular plugin that does related posts. I found out by checking on slow queries log. Here’s how to get MySQL to log slow queries:

If you are using Ubuntu of Debian-based operating systems, it’s found in /etc/mysql/my.cnf. You may need to use

[code lang=“bash”]sudo nano /etc/mysql/my.cnf[/code]

Press CTRL + W, that’s search in nano. Find “slow” for the section for logging slow queries.

[code lang=“bash”]# Here you can see queries with especially long duration

#log_slow_queries = /var/log/mysql/mysql-slow.log

#long_query_time = 2

#log-queries-not-using-indexes[/code]

I uncommented “log_slow_queries” and “long_query_time”. I put long_query_time to 8. That requires a bit of experimentation. It depends on your environment.

I run the following command to check the slow queries:

[code lang=“bash”]sudo cat /var/log/mysql/mysql-slow.log[/code]

After you change the configuration in my.cnf, you need to restart. You can do so using:

[code lang=“bash”]sudo /etc/init.d/mysql restart[/code]

Hope it helps.

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