This parameter is required to improve performance of DB2 when operating with the particular transaction manager.
在操作特定的事务管理器时，需要此参数来改进DB2的性能。
2
The state of such a process instance is persisted in a database (the BPE database) between two transactions so that operating system resources are occupied only during an in-flight transaction.
It is also important that the transaction manager be able to handle certain resource manager failures, and as such continue operating should this situation occur.