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NAME

       todoTodo List
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       Global MDB_rel_func (MDB_val *item, void *oldptr, void *newptr, void *relctx)
           This feature is currently unimplemented.

       Global mdb_set_relfunc (MDB_txn *txn, MDB_dbi dbi, MDB_rel_func *rel)
           The relocation function is called whenever it is necessary to move the data of an item
           to a different position in the database (e.g. through tree balancing operations,
           shifts as a result of adds or deletes, etc.). It is intended to allow
           address/position-dependent data items to be stored in a database in an environment
           opened with the MDB_FIXEDMAP option. Currently the relocation feature is unimplemented
           and setting this function has no effect.