Hi,
i found an open source benchmark project at http://sourceforge.net/projects/benchmark/ that includes some of the most widespread databases:


- Oracle Berkeley DB
- Perst
- MySQL (server)
- MS SQL Server CE
- STSdb
- Access
- HamsterDB
- SQLite
- Db4objects
- Firebird
- H2.

Database Benchmark(GNU GPL) on it allows to simulate the performance and behavior of different database managment systems during work with large number of records(etc. 1M, 10М). You can see diagrams of performance, query speed, amount of occupied memory ....
to be able to work it must have installed .NET 3.5 (Mono for Linux)