An alternative approach to check the scope of CAS tables
Chances are, your Viya environment contains many caslibs and many tables within these caslibs. Determining the scope of these tables is extremely important. This affects your downstream processing. You don’t want to delete, overwrite, or alter session scope tables by accident. Conversely, you don’t want to delete promoted tables, especially if they are being accessed by more than one user.
One handy way to determine the scope of a CAS table is via the tableInfo CAS action. It provides valuable information about a particular table including whether it has been promoted. The tableInfo action output is written to the results tab in SAS Studio. An alternative approach is to use the tableExists CAS action. This action does not produce any output in the results tab. It merely sends a numeric code to a result table. Subsequently the result table can be queried to discover the scope of the CAS table.
The following example demonstrates how to leverage this approach.
First, identify your caslib and CAS table in the two %let statements. Once the code is executed, a result of 0, 1, or 2 will be written to the result table “r”. If the table doesn’t exist, a code of 0 will be written to the result table. A code of 1 will be written for session scoped tables and a code of 2 will be written for globally (promoted) scoped tables. Using conditional logic coupled with the “exists” dictionary name, a message will be written to the SAS log based on the corresponding code value. For example, if the CARS dataset is written to the CASUSER caslib as a session scoped table, the following note will be displayed in the SAS log:
The CAS table CARS has a session scope.
NOTE: PROCEDURE CAS used (Total process time):
real time 0.03 seconds
cpu time 0.03 seconds
If the CLASS dataset is written to the CASUSER caslib as a globally scoped table, the following note will be displayed in the SAS log:
The CAS table CLASS has a global scope.
NOTE: PROCEDURE CAS used (Total process time):
real time 0.03 seconds
cpu time 0.01 seconds
Lastly, if you search for a table that is not in CAS, the following message will appear in the SAS log:
The CAS table XYZ does not exist.
NOTE: PROCEDURE CAS used (Total process time):
real time 0.03 seconds
cpu time 0.01 seconds
If it helps you, consider using this technique when checking the scope of your CAS tables. Happy coding!
