The session parameters to which Parameter List +X'44' point are those returned by a VTAM INQUIRE SESSPARMS request. For a description of the format of these parameters, see the IBM VTAM Programming guide. The format of these parameters is mapped by macro ISTDBIND.
Important! In developing code to use this exit, you must remember that after closing a QSAM DCB, the buffer pool is not released and will be reused only if the same copy of the DCB with the buffer pool pointers unchanged is reopened. Continuously reusing a fresh copy of the DCB without issuing FREEPOOL against the previously closed DCBs will inevitably lead to subsequent GETMAIN errors. Similarly, if a DCB is to be reused with different attributes, a FREEPOOL is recommended.
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