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Resource recovery functions z/OS MVS Programming: Resource Recovery SA23-1395-00 |
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Resource recovery based on the two-phase commit protocol has two
functions:
The set of changes that are to be made or not made as a unit are called a unit of recovery (UR). A UR represents an application program's changes to resources since the last commit or backout or, for the first UR, since the beginning of the application. Each UR is associated with a context, which consists of the UR, or more than one UR, with the associated application programs, resource managers, and protected resources. A context, which is sometimes called a work context, represents a work request. The life of a context consists typically of a series of URs. Figure 1 shows the relation of the context, application program, and URs. Figure 1. Context as a Series of URs
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Copyright IBM Corporation 1990, 2014
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