Duplicate fault processing

Z Abend Investigator provides two different types of duplicate fault processing, "fast" and "normal", where "fast" implies pre-analysis detection and "normal" implies post-analysis detection.

The "fast" duplicate fault type is further divided into two different subtypes, one at a CICS® region level and one that encompasses an entire MVS™ image. The latter is applicable to IMS only.

A fault that is not deemed a "fast" duplicate is still subject to "normal" duplicate processing.

The different types of duplicate processing are controlled using the NoDup option (for details, see NoDup). While the NoDup option description provides a detailed explanation of each type, the following is provided as a general overview for easier comparison.
Table 1. Duplicate processing type comparison
Aspect of processing ImageFast CICSfast Normal
Controlled using option NoDup(ImageFast( IMS(...))) NoDup(CICSfast(...)) NoDup(Normal(...))
Applicable to All faults that use IMS, except CICS transaction faults Only CICS transaction faults All faults
Order of processing 1 1 2
Improves performance by suppressing fault analysis (that is, no HFZDA TCB attach) Yes Yes No
Saves disk space by suppressing history file fault entry Yes Yes Yes
Requires HFZS subsystem started Yes No No
Duplicate signature repository location HFZS subsystem storage CICS region storage History file index
Default setting Enabled, 5 minutes Enabled, 5 minutes Enabled, 24 hours

The number of duplicate faults that have occurred against a given history file fault entry is shown in the Fault Entry List display DUPS column (for details, see The Fault Entry List display).