The PrefetchBuffer (PBUF) connection parameter controls the per-connection maximum memory allocated on the client to store
In some circumstances, increasing the number of prefetched rows can improve query performance. You can increase the number
of prefetched rows using the PrefetchRows (PROWS) and PrefetchBuffer (PBUF) connection parameters.
Increasing the PrefetchBuffer (PBUF) connection parameter also increases the amount of memory used to buffer GET DATA requests.
This may improve performance for some applications that process many GET DATA (SQLGetData) requests.