2 May 26, 2010 02:43
From my experience of using b2evo, you can share one database with different b2evo installations. You just need to specify different table name prefix for different installations at setup. I never had problems with this setup.
However if you want to share with other application, you have to check how that application uses database. Some applications may think that a database is used solely by it.
eg it may have database tools to dump and restore database and depends how it's written, it may wipe out the whole database before restoring data. This may affect other applications using the same database.