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and therefore recovery of the most recent units of work cannot be carried out.
However, data might be missing from any part of the system log and CICS cannot
identify what is missing. CICS cannot examine the log and determine exactly what
data is missing, because the log data might appear consistent in itself even when
CICS has detected that some data is missing.
These are the messages that CICS issues as it reads the log during a warm or
emergency start and that can help you identify which units of work were
recovered:
DFHRM0402
This message is issued for each unit of work when it is first encountered
on the log.
DFHRM0403 and DFHRM0404
One of these messages is issued for each unit of work when its context is
found. The message reports the state of the unit of work.
DFHRM0405
This message is issued when a complete keypoint has been recovered from
the log.
If you see that message DFHRM0402 is issued for a unit of work, and it is matched
by message DFHRM0403 or DFHRM0404, you can be sure of the state of the unit
of work. If you see message DFHRM0405, you can use the preceding messages to
determine which units of work are incomplete, and you can also be sure that none
of the units of work is completely missing.
Another class of problem with the system log is one that does not indicate any loss
of previously logged data; for example, access to the logstream was lost due to
termination of the MVS system logger address space. This class of problem causes
an immediate termination of CICS because a subsequent emergency restart will
probably succeed when the cause of the problem has been resolved.
For information about how to deal with system log problems, see the CICS Problem
Determination Guide.
How the state of the CICS region is reconstructed
CICS recovery manager uses the type-of-restart indicator in its domain state record
from the global catalog to determine which type of restart it is to perform.
This indicator operates as follows:
v Before the end of initialization, on all types of startup, CICS sets the indicator in
the control record to “emergency restart needed”.
v If CICS terminates normally, this indicator is changed to “warm start possible”.
v If CICS terminates abnormally because the system log has been corrupted and is
no longer usable, this indicator is changed to “no restart”. After fixing the
system log, perform an initial start of the failed CICS region.
v For an automatic start (START=AUTO):
– If the indicator says “warm start possible”, CICS performs a warm start.
– If the indicator says “emergency restart needed”, CICS performs an
emergency restart.
34 CICS TS for z/OS 4.1: Recovery and Restart Guide
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