MySQL: Out of Resources

One of our sister companies called me today asking if I know anything about the error that they are encountering, which is:

ERROR 23 (HY000): Out of resources when opening file (Errcode: 24)

Looking at the error, it looks like it’s a database parameter value. Researching it, my hunch was correct. The parameter open_files_limit need to be changed to resolve the issue. So, I changed the value of the parameter in the /etc/my.cnf file and restarted the database.