Applications must now pass the DB_NOSYNC flag to the methods - DB->remove, DB->rename, DB_ENV->dbremove, and DB_ENV->dbrename, to avoid a multi-database file to be flushed from cache. This flag is applicable if you have created the database handle in a non-transactional environment.

By default, all non-transactional database remove/rename operations cause data to be synced to disk. This can now be overridden using the DB_NOSYNC flag so that files can be accessed outside the environment after the database handles are closed.