This Natural profile parameter sets the maximum size of the buffer area required by Natural for VSAM. If set to 0 or if the requested space is not available, Natural for VSAM cannot be used.

Possible settings	1 - 512	Buffer size in KB.
	0	With VSIZE=0, Natural for VSAM cannot be used.
Default setting	0
Dynamic specification	yes
Specification within session	no

Notes:

1. This Natural profile parameter applies only if Natural for VSAM is installed.
2. If Natural for VSAM is installed, the corresponding Natural buffers are requested at the initialization of the Natural session.
3. If the requested space is not available, Natural for VSAM cannot be used. An appropriate error message at the initialization of Natural for VSAM tells you which buffer specified in the NTVSAM macro in the Natural parameter module does not fit into the VSIZE area; you can then increase the size of the VSIZE area.
4. If you do not need VSAM support during a Natural session, it is recommended that you invoke Natural with VSIZE=0 to avoid overhead caused by handling of unused buffers.