SAP ABAP Data Element DB2DASD_USE_SUM (Actual DASD usage (in KB) of TS (sum of partitions))

Hierarchy

☛ SAP_BASIS (Software Component) SAP Basis Component
   ⤷ BC-DB-DB2 (Application Component) DB2 for z/OS
     ⤷ STU2 (Package) CCMS for DB2 for OS/390

Basic Data

Data Element	DB2DASD_USE_SUM
Short Description	Actual DASD usage (in KB) of TS (sum of partitions)

Data Type

Category of Dictionary Type	D	Domain
Type of Object Referenced		No Information
Domain / Name of Reference Type	FLTP
Data Type	FLTP	Floating point number, accurate to 8 bytes
Length	16
Decimal Places	16
Output Length	22
Value Table

Further Characteristics

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Parameter ID
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No Input History	☐
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Field Label

	Length	Field Label
Short	10	DASD use
Medium	15	DASD usage
Long	26	Summed usage (in KB) of TS
Heading	51	Actual DASD usage (in KB) of TS (sum of partitions)

Documentation

Definition

This number is relevant for ressource planning (i.e. which number of disks will be necessary for the DB2 subsystem of a new SAP system). The HARBA value of DB2s VSAM data sets is not suited for this task, because it represents only the number of data that can be used by DB2 itself. The physical space consumption is higher.

This depends on the volume the dataset is placed upon. For instance for model 3390 disk architecture, a track contains 56664 Bytes, but DB2 uses for TS only 12 pages a 4096 Bytes.

Thus for TS on 3390 architecture disk, there is an unused space factor of 56664 / ( 12 * 4096 ) = 1,15283203125. This means an overhead of about 15 percent.

This value includes this overhead.

History

Last changed by/on	SAP	20070813
SAP Release Created in	700