Subsetting a GDB leaves all data remaining and does not decrease size of GDB

Problem/Symptom:
I have masked out my XY data in a GDB, and am trying to subset the GDB. However, the resulting GDB still contains all of the data and the size is as large as the original GDB.

Environment:
This resolution applies to all versions of Oasis Montaj and Target

Resolution:
When subsetting the GDB, make sure to use either your X or your Y channel as the mask channel, and not the _X or _Y channel.

Root Cause:
The _X and _Y channels are the backup X and Y channels and contain all of the original XY data points.