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MINBUFSP: Specifying Minimum Target Buffer Space

Default: MINBUFNI * index CI size + MINBUFND * data CI size

The MINBUFSP parameter allows you to make sure that at least MINBUFSP bytes are used for buffers. You specify MINBUFSP as:

MINBUFSP=value

If no matching LEVEL selector specifies MINBUFSP, the SYSTEM default is used.

If you do not specify a system default, MINBUFNI and MINBUFND values are used to calculate the minimum buffer space. If you have not specified either MINBUFNI or MINBUFND, the default value(s) are used for the missing specifications.

If you do specify a MINBUFSP, it is validated against the 'true' VSAM minimum of ((1+strno) * (data CI size)) plus ((strno) * (index CI size)). This is the absolute minimum allowed by VSAM and overrides your specified MINBUFSP if yours is smaller.