gdbm_load_package
The first time this procedure is called within a Tcl interpreter instance, this loads the gdbm package, which loads the gdbm extension library.
gdbm_load_package
After running, this procedure becomes a no-op and subsequent calls have no effect.
Note: This procedure has no arguments. It is
called the first time any gdbm_* command is run.
To bypass this, invoke this command directly before running any gdbm_* commands to explicitly load the gdbm package.