The relational test database is the pivotal point of the software structure. On one hand, this is where the test applications and test systems used for productive testing are stored; on the other hand, it provides the storage space for all DUT-related test data. Depending on customer requirements, the test database may either be hosted locally on the test system or centrally on a server, supporting several test systems. The database performance is sufficient for a high-volume production environment with many test systems which access the central database in parallel. LXinstruments prefers to implement the database as a license-free MySQL database; it is however also possible to realize a version based on Microsoft SQL.