HINT_$PHY$ is not working

Products

• Datacom
• DATACOM - AD

Issue/Introduction

I ran an SQL SELECT using hint key HINT_$PHY$ to do physical reads only but find that my index is still accessed. 

Environment

z/OS  
CA Datacom 15.1

Cause

Table involved in the SQL SELECT resides in an area for which a BA24 (blocksize alter) process has been run.
Once a BA24 process has been run, so even if that ended successfully , it is not possible to do physical sequential reading . 

Resolution

After running DBUTLTY BACKUP/LOAD all physical reads will be restored.

Additional Information

DEFECT DE370752 has been opened for the CBS Diagnostic report to reflect the use of physical data scan or not . And if not, for what reason.