Difference between TSQ and TDQ in CICS - Interview Question

In CICS, a Temporary Storage Queue (TSQ) is used to store data temporarily within a CICS region. Data in a TSQ remains until it is explicitly deleted or the CICS region is recycled. TSQ data is persistent across program executions within the same CICS region.

On the other hand, a Transient Data Queue (TDQ) is used for short-term storage and communication between CICS programs. Data in a TDQ is not persistent and is automatically deleted once it is read by a program or when the CICS region is recycled.

Therefore, the key difference between a TSQ and a TDQ in CICS is the persistence of data. Data stored in a TSQ persists across program executions, while data in a TDQ is transient and is meant for immediate communication between programs.