v2.5 [Oct 19, 2009]
The refactoring Firebird's threading architecture in this release takes advantage of the symmetric multiprocessing (SMP) capabilities of multiprocessor hardware. This has a noticeable effect on the scaleability of Superserver when multiple databases are being accessed simultaneously but its major effect is the emergence of the architectural "Superclassic" model that will underpin the fine-grained multi-threading under development for Firebird 3.
v2.5
-New threading architecture common to Super Server and Classic server.
-SQL additions and improvements.
-There are more information on the monitoring tables.
-New audit system that offers information in real time.
-International language support.
-Fixed many reported bugs.