https://www.ibm.com/docs/en/db2-for-zos/13.0.0?topic=recovery-unit-work-in-tso
Applications that use the TSO attachment facility can explicitly define units of work by using the SQL COMMIT and ROLLBACK statements.
unit of workapplication programmingsql
https://www.ibm.com/docs/en/db2-for-zos/13.0.0?topic=programs-unit-work-in-ims-online
IMS applications can explicitly define units of work by using a CHKP, SYNC, ROLL, or ROLB call, or, for single-mode transactions, a GU call.
unit of workapplication programmingsql