mariadb-client-core-10.1 1:10.1.40-0ubuntu0.18.04.1 (amd64 binary) in ubuntu bionic

 MariaDB is a fast, stable and true multi-user, multi-threaded SQL database
 server. SQL (Structured Query Language) is the most popular database query
 language in the world. The main goals of MariaDB are speed, robustness and
 ease of use.
 .
 This package includes the core client files, as used by Akonadi.