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CICS recovery manager
The recovery manager ensures the integrity and consistency of resources (such as
files and databases) both within a single CICS region and distributed over
interconnected systems in a network.
Figure 3 on page 18 shows the resource managers and their resources with which
the CICS recovery manager works.
The main functions of the CICS recovery manager are:
X
Unit of work .
.
Task A .
.
SOT EOT .
(SP).
Mod .
.
.
Commit.
Mod .
.
.
Backout .
===========.
.
UOW 1 UOW 2 UOW 3 . UOW 4
.
Task B
.
SOT SP SP . SP EOT
. (SP)
Mod Mod Mod . Mod
123.4
.
.
Commit Commit .Commit Commit
Mod 1 Mod 2 .Mod 3 Mod 4
.
.
Backout .
=======================.
.
Task C
.
SOT . EOT
. (SP)
Mod Mod .
.
.
. Commit
Abbreviations: . Mods
EOT: End of task .
UOW: Unit of work X
Mod: Modification to database
SOT: Start of task
SP: Syncpoint
X: Moment of system failure
Figure 2. Backout of units of work
Chapter 2. Resource recovery in CICS 17