Description
bool 
oci_set_prefetch ( resource statement [, int rows] )
     Sets the number of rows to be prefetched after successful call to
     oci_execute(). The default value for
     rows is 1.
    
Note: 
      In PHP versions before 5.0.0 you must use ocisetprefetch() instead. 
      This name still can be used, it was left as alias of
      oci_set_prefetch() for downwards compatability. 
      This, however, is deprecated and not recommended.
     
     Returns TRUE on success or FALSE on failure.
    
     See also oci8_.default_prefetch 
     ini option.