This is optional environment variable for local transaction optimization. When ARTKIX_XA_DISABLE=yes, it uses database local transaction instead of XA transaction. All ART application servers, such as ARTSTRN/1, ARTATRN/1, ARTCTRN/1, ARTWTRN/1, and ARTDPL support ARTKIX_XA_DISABLE by default; however, when rebuilding your own ART application server, you must specify -n option in buildartcics command to support ARTKIX_XA_DISABLE. This local transaction optimization must be used only in local transaction scenario. Default value is NO.