SAP ABAP Data Element READ_AHEAD (Read ahead effectiveness)
Hierarchy
☛
SAP_BASIS (Software Component) SAP Basis Component
⤷
BC-DB-INF (Application Component) Informix
⤷
STUI (Package) Informix Database Monitor
SAP_BASIS (Software Component) SAP Basis Component⤷
BC-DB-INF (Application Component) Informix⤷
STUI (Package) Informix Database Monitor
Basic Data
| Data Element | READ_AHEAD |
| Short Description | Read ahead effectiveness |
Data Type
| Category of Dictionary Type | D | Domain |
| Type of Object Referenced | No Information | |
| Domain / Name of Reference Type | SINT4_NOS | |
| Data Type | INT4 | 4-byte integer, integer number with sign |
| 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 | Page read |
| Medium | 15 | Read ahead |
| Long | 20 | INFORMIX |
| Heading | 0 |
Documentation
Definition
This value gives the percentage of buffers respectivly dbspace pages read ahead from disk which were really used afterwards.
When a sequential scan situation is detected by the Online database server a predetermined amount of information is read-ahead off disk, thus optimizing disk I/O overhead.
History
| Last changed by/on | SAP | 19950505 |
| SAP Release Created in |
