WordPress going offline for some minutes in some database-intensive activities


I am using a WordPress droplet for this website:

but when I try to do some MySQL-intensive activities (i.e editing more than a post, or fixing links in web pages) sometimes MySQL goes offline. I looked in /var/log/mysql/error.log but it looks empty, so no idea about what problem I need to solve.

Looked inside /etc/mysql/mysql.conf.d/mysqld.cnf and it is ok for log ON.

/var/log/mysql/mysql-slow.log is empty too.

Any hint for this?

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.

Yes I’d definitely switch to InnoDB. This issue would go away. Here’s a quick one liner:

mysql -u root -e "show tables" <my_db> | while read tbl; do echo mysql -u root -e "alter table ${tbl} engine=InnoDB" <my_db>; done

What do you mean by MySQL goes offline? What error do you get on the page? Is it a “freeze” of pages or an actual DB error connection?

If the DB is actually shutdown, you should be able to see a shutdown/startup in the error log. Otherwise I’d suspect your DB engine is MyISAM, which does table level locks (vs row-level locks) on the whole table and makes editing posts simultaneously not possible.

Run these commands to get a feel of things:

mysql -u root -e "show table status" unixy_whmcs1|grep -i myisam

If you get many MyISAM tables, it’s probably time to switch to InnoDB.