the \fBbdb\fP backend that uses a hierarchical database layout which
supports subtree renames. It is both more space-efficient and more
execution-efficient than the \fBbdb\fP backend. It is otherwise identical
the \fBbdb\fP backend that uses a hierarchical database layout which
supports subtree renames. It is both more space-efficient and more
execution-efficient than the \fBbdb\fP backend. It is otherwise identical