Duplicate fault processing
Fault Analyzer 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.
| 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 IDIDA TCB attach) | Yes | Yes | No |
| Saves disk space by suppressing history file fault entry | Yes | Yes | Yes |
| Requires IDIS subsystem started | Yes | No | No |
| Duplicate signature repository location | IDIS 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).