logical unit of work(LUW)

A sequence of processing actions (data base changes for example) that must be completed before any of the individual actions can be regarded as committed. When changes are committed (by successful completion of the LUW and recording of the sync point on the system log), they do not need to be backed out after a subsequent failure of the task or system.The end of an LUW is marked in a transaction by a sync point—issued either by the user program or by CICS at the end of task. In the absence of user sync points, the entire task is an LUW.; 在認為某一操作結束前,必須完成的一系列處理活動(例如更改數據庫)。如果更改結束(LUW成功地完成且已在系統日志上 記錄了同步點),則在隨后發生任務或系統失敗的情況下,就不必復原這些曾做過的更改。在 一個事項處理程序(即交易)中, 由同步點(在任務結束時由用戶程序發出,或由CICS發出)標識一個LUW的結束。如果沒有用戶 同步點,則整個任務為一個LUW。