SAP ABAP Data Element CHKWRITS64 (Writes resulting from a checkpoint)

Hierarchy

☛ SAP_BASIS (Software Component) SAP Basis Component
   ⤷ BC-DB-INF (Application Component) Informix
     ⤷ STUI (Package) Informix Database Monitor

Basic Data

Data Element	CHKWRITS64
Short Description	Writes resulting from a checkpoint

Data Type

Category of Dictionary Type	D	Domain
Type of Object Referenced		No Information
Domain / Name of Reference Type	STUI_INT64
Data Type	DEC	Counter or amount field with comma and sign
Length	18
Decimal Places	0
Output Length	24
Value Table

Further Characteristics

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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	CHKWRITES
Medium	15	Chunk Writes
Long	0
Heading	0

Documentation

Definition

Chunk writes are performed by page cleaner threads during a checkpoint, or when every page in the shared memory buffer pool is modified. Chunk writes are the most efficient types of writes available to Online. Chunk writes are sorted writes, which minimizes head movement (disk seek time) on the disk and enables the page cleaners to use the big buffers during the write if possible. In addition, since user threads must wait for the checkpoint to complete, the page-cleaner threads are not competing with a large number of threads for CPU time. As a result, the page cleaner threads can finish their work with less context switching.

History

Last changed by/on	SAP	20041216
SAP Release Created in	700