Hierarchy
SAP_BASIS (Software Component) SAP Basis Component⤷
BC-DB-DB2 (Application Component) DB2 for z/OS⤷
STU3 (Package) Development Class for Database Monitor
Basic Data
| Data Element | DB2TFCONRA |
| Short Description | False contention rate |
Data Type
| Category of Dictionary Type | D | Domain |
| Type of Object Referenced | No Information | |
| Domain / Name of Reference Type | DB2CHAR10 | |
| Data Type | CHAR | Character String |
| Length | 10 | |
| Decimal Places | 0 | |
| Output Length | 10 | |
| Value Table |
Further Characteristics
| Search Help: Name | ||
| Search Help: Parameters | ||
| Parameter ID | ||
| Default Component name | ||
| Change document | ||
| No Input History | ||
| Basic direction is set to LTR | ||
| No BIDI Filtering |
Field Label
| Length | Field Label | |
| Short | 0 | |
| Medium | 0 | |
| Long | 21 | False contention rate |
| Heading | 0 |
Documentation
Definition
This ratio shows which how many requests that were synchronously propagated to XES ended up in a false contention.
It value is computed as
100 * QTGAFLSE / (QTGAIGLO + QTGASGLO + QTGAFLSE + QTGALSLM + QTGACSLM + QTGAUSLM)
where:
QTGAFLSE:
The number of suspends because of false contentions.
This occurs when different resource names hash to the same entry in the coupling facility lock table. This causes MVS XES to detect contention on the hash class. However, when MVS XES determines that there is no real conflict on the resource, the contention is calles "FALSE".
QTGAIGLO:
The number of suspends caused by IRLM global resource contention (IRLM lock states were in conflict on the same resource).
QTGASGLO:
The number of suspends caused by MVS XES global resource contention (MVS XES lock states were in conflict but IRLM lock states were not).
QTGALSLM:
The number of lock requests propagated to MVS XES synchronously (that is, under the user's execution unit).
This count includes both L-locks and P-locks. It is not incremented if the request is suspended before going to XES.
QTGACSLM:
The number of change requests propagated to MVS XES synchronously (that is, under the user's execution unit).
This count includes both L-locks and P-locks. It is not incremented if the request is suspended before going to XES.
QTGAUSLM:
The number of IRLM unlock requests propagated to MVS XES synchronously (that is, under the user's execution unit).
This count includes both L-locks and P-locks. It is not incremented if the request is suspended before going to XES.
History
| Last changed by/on | SAP | 20070813 |
| SAP Release Created in | 700 |
