SAP ABAP Data Element DB2WP4SJRC (DB2 for OS/390: Star Join controls)
Hierarchy
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SAP_BASIS (Software Component) SAP Basis Component
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BC-DB-DB2 (Application Component) DB2 for z/OS
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STU3 (Package) Development Class for Database Monitor
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 | DB2WP4SJRC |
| Short Description | DB2 for OS/390: Star Join controls |
Data Type
| Category of Dictionary Type | Direct Type Entry | |
| Type of Object Referenced | No Information | |
| Domain / Name of Reference Type | ||
| 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 | 10 | Star Join |
| Medium | 20 | Star Join controls |
| Long | 30 | Star Join controls |
| Heading | 30 | Star Join controls |
Documentation
Definition
The value controls if and when a star join will be used in the access path selection process. Possible values are:
- 0 : enable star join under current conditions (fact table 25x larger than any dimension table)
- -1 : disable star join (the default)
- 1 : enable star join, the fact table will be the largest table in the star join query, i.e. no fact/dimention ratio checking.
- >1 : enable star join if the fact-table-to-dimension-table ratio is equal or larger than the given value.
ZPARM name is STARJOIN in DSN6SPRM.
History
| Last changed by/on | SAP | 20110908 |
| SAP Release Created in | 640 |
