IBM SC34-7012-01 manual Cics recovery manager, Backout of units of work

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

1

2

3

.

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

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:

Chapter 2. Resource recovery in CICS 17