MySql, PostgreSQL, SYBASE, IBM-DB2, Oracle Database are some of the most prominent databases considered best for PHP web applications. There are other supported databases like Cubrid, DB++, dBase, filePro, FireBird/InterBase, FrontBase, Informix, Ingres, MaxDB, Mongo, mSQL, Ovrimos SQL, Paradox, SQLite, SQLite3, SQLSRV, Tokyo Tyrant.