When you upgrade Oracle Tuxedo Application Runtime for CICS from 12c Release 1 (12.1.1) or older release, you must rerun the CICS Preprocessor for the CICS COBOL programs and re-compile them. For upgrades from Oracle Tuxedo Application Runtime for CICS 12c Release 2 (12.1.3), you do not need to rerun the CICS Preprocessor; however, the programs might need to be re-compiled with versions of COBOL compilers certified for this release (see certification matrix link in Supported Platforms) depending on the binary compatibility of the COBOL compilers.

If upgrading from release 11.1.1.2 or earlier, you must ensure the ARTADM server is configured in the Oracle Tuxedo UBBCONFIG file for CICS Runtime.

If using COBOL-IT, you must specify the -fthread-safe option when compiling CICS programs.

When using Micro Focus Visual COBOL 7.0, we recommend you set COBOL runtime tunable parameter subsystem_cancel_mode=1, which specifies logical cancel for CBL_SUBSYSTEM cancels. See Micro Focus documentation for more information.