Function dpiStmt_setPrefetchRows 

pub unsafe extern "C" fn dpiStmt_setPrefetchRows(
    stmt: *mut dpiStmt,
    numRows: u32,
) -> c_int

Sets the number of rows that will be prefetched by the Oracle Client library when a query is executed. The default value is DPI_DEFAULT_PREFETCH_ROWS (2). Increasing this value may reduce the number of round-trips to the database that are required in order to fetch rows, but at the cost of increasing memory requirements. Setting this value to 0 will disable prefetch completely, which may be useful when the timing for fetching rows must be controlled by the caller.

The current value can be determined by calling dpiStmt_getPrefetchRows().

The function returns DPI_SUCCESS for success and DPI_FAILURE for failure.