z/OS DFSMStvs Planning and Operating Guide
z/OS DFSMStvs Planning and Operating Guide
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Primary system log z/OS DFSMStvs Planning and Operating Guide SC23-6877-00 |
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The primary system log provides a separate backout
log stream for each instance of DFSMStvs, called the undo log. The
name of the undo log must be as follows:
The undo log must be allocated before you start DFSMStvs. This log stream is connected during DFSMStvs initialization and disconnected when the DFSMStvs instance ends. A DFSMStvs instance logs its backout records in its undo log stream. These undo log records are used to back out the uncommitted changes made by a unit of recovery and are therefore written before the data is changed. An application can initiate backout, or it can occur as a result of an error, such as an abnormal end of the application. 
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 Copyright IBM Corporation 1990, 2014 |
