SAP ABAP Data Element AIOVPS (Number of AIO virtual processors)
Hierarchy
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SAP_BASIS (Software Component) SAP Basis Component
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BC-DB-INF (Application Component) Informix
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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 | AIOVPS |
| Short Description | Number of AIO virtual processors |
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 | aio |
| Medium | 15 | aio vp |
| Long | 20 | Virtual processors |
| Heading | 0 |
Documentation
Definition
The AIO virtual processors perform all non-logging disk I/O except kernel asynchronous I/O, when it's implemented.
If kernel asynchronous I/O is used you will find kaio threads in the CPU virtual processor class. In this case the kaio threads issue read and write requests directly to the operating system and avoid a switch between the CPU and AIO virtual processors.
The number of AIO virtual processors is defined by database configuration parameter NUMAIOVPS and you can start additional AIO virtual processors with OnLine utility onmode.
If kernel asynchronous I/O is not implemented, two AIO virtual processors per disk is sufficient. Otherwise one AIO virtual processor is sufficient.
History
| Last changed by/on | SAP | 20010130 |
| SAP Release Created in |
