GNU dbm is a library of database functions that use extendible hashing and works similar to the standard UNIX dbm functions. These routines are provided to a programmer needing to create and manipulate a hashed database.
Grot rotates MySQL binary log files on replication master server. It works by first determining what slaves are connected to the server. Then it connects to each slave and determines what master log file it currently uses. Finally, it removes those logs on master that are older than the oldest of logs used by slaves.