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 | DB2FCONRAT |
| 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 * QTGSFLMG / (QTGSIGLO + QTGSSGLO + QTGSFLSE + QTGSLSLM + QTGSCSLM + QTGSUSLM)
where:
QTGSFLMG:
The number of false contentions for lock and unlock requests that were encountered on the z/OS image. False contention occurs when different resource names hash to the same entry in the coupling facility lock table.
QTGSIGLO:
The number of suspends caused by IRLM global resource contention (IRLM lock states were in conflict on the same resource).
QTGSSGLO:
The number of suspends caused by MVS XES global resource contention (MVS XES lock states were in conflict but IRLM lock states were not).
QTGSLSLM:
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.
QTGSCSLM:
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.
QTGSUSLM:
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 | 20100420 |
| SAP Release Created in | 700 |
