On cPanel servers, you may come across the process /usr/local/cpanel/bin/mysqluserstore
/usr/local/cpanel/bin/mysqluserstore creates and updates the /var/cpanel/databases/users.db and /var/cpanel/databases/users.db.cache files. It is a Perl script, so if you are familiar with Perl, you can view the file and see what it does.
mysqluserstore is a necessary maintenance task that is run by a cron job, usually every two hours at 30 minutes past the hour. It should not be disabled or modified at all because it is a necessary part of cPanel maintenance.
