01 What happened
The trigger simulation tool in SAP Software Update Manager (SP26+) lets project teams simulate freeze and recording triggers in a controlled manner to detect business process impacts and performance changes before the actual conversion window.
02 Key details
- The trigger simulation tool, part of SUM SP26 or higher, creates three trigger types on tables: UKR (recording), FREEZE (block writes), and SNAPSHOT (consistent restore).
- FREEZE triggers offer three modes: FREEZE_LOG (allows DML, logs first access), FREEZE_ERROR (blocks DML), and FREEZE_LOG_ERROR (blocks and logs), manageable via the trigger control centre.
- The tool requires a table classification file (PUTTB_SHD.ZIP) from a completed S/4HANA conversion and recommends first running in quality or pre-production systems before moving to production.
- Key measurements include tables accessed with DML on freeze triggers, query performance changes, data volume generated for replication, and replication time.
03 Why it matters
Without trigger simulation, unexpected access to frozen tables during production conversion can cause costly cycle aborts and delays; simulating early reduces unpredictability and the chance of rollback.
04 Who it matters to
SAP Basis administrators and S/4HANA conversion project managers.
Original source