Hi,

ERP5 uses ZODB as its main database. It is slowly transitionning to our
homebrewed NEO storage, which is a distributed database following the same
API and implementing the same features as ZODB.

Also, https://mariadb.org/ is used as a catalog of ZODB/NEO, indexing the most
commons and shared properties of all ERP5 documents and their fulltext
representation, in order to easily and fastly query the ZODB/NEO storage.

Regards,

Nicolas