FAQ:

Q: My <tab> completion is gone, why?
A: You have "no-auto-rehash" in the "[mysql]" section of /etc/mysql/my.cnf!

Q: Some Perl-based tools like innotop, mariadb-report or mytop fail with
   "Can't locate DBI.pm" or similar errors. What should I install?
A: The core mariadb-client package only suggests these Perl modules as
   optional enhancements. Install the following packages if you want to use
   the advanced Perl clients:
     - libdbi-perl
     - libdbd-mariadb-perl (or libdbd-mysql-perl)
     - libterm-readkey-perl