DBBUF keyword

The DBBUF keyword specifies the number of buffers to be used to access the database data set groups or areas.

For HALDB, HDAM, HIDAM database data sets, and DEDBs, if the High Performance Input/Output interface (HPIO) or Advanced Image Copy Services (FASTIC) is used, the DBBUF keyword is ignored.

Functions that support this keyword
  • Image Copy function
  • Recovery function
  • Create Image Copy function
Statements that support this keyword
  • GLOBAL statement
  • GROUP statement
  • IC/AIC statement
  • CIC/ACIC statement
  • RCV statement
Site default option
Supported
Related keyword
None.
Format
Read syntax diagramSkip visual syntax diagramDBBUF= nnnnn
nnnnn
The left-aligned number of buffers used to access the database data set groups or areas. Specify a value in the range of 0 - 32767. A value of 0 specifies that IMS HP Image Copy calculate and apply the optimal value.

When the access method of the database data set is OSAM and the specified value is greater than 255, IMS HP Image Copy uses 255 for the OSAM data set.

Default value
None.
Usage note
If the keyword is omitted, IMS HP Image Copy accesses the database data set with the optimized number of buffers. For more information about how IMS HP Image Copy determines the optimal value, see the following topics: