HDSTRACE may be run directly from DCL with the following command.
$ HDSTRACE
You will be prompted for the HDS object or structure to be traced.
If you wish to trace several files or objects it is more efficient to run HDSTRACE from ICL. If you are already using ICL just enter
ICL> HDSTRACE
If you are in DCL, the following will start both ICL and TRACE.
$ ADAM HDSTRACE
The command can be abbreviated to HDST and the old command TRACE
will also work from both VMS and ICL.
HDSTRACE --- Listing HDS Data Files