For non-2PC applications, the IMS interface does not participate in any IMS checkpointing or synchronization. IMS and database commits are independently executed.
Although an application program can perform an explicit IMS commit (for example, Checkpoint) and an explicit database commit (for example, END TRANSACTION) in consecutive statements, there is a period of time when the commits are not synchronized. A failure at this point could leave the databases in an inconsistent or indeterminate state.