In prior releases, CA Datacom presented different strategies to upgrade a CXX from one release to the next. All of them required an outage for the conversion.
Version 15.0 completely removes the outage. Version 15.0 supports a CXX initialized and used as Version 14.0. In fact, 15.0 can only initialize a CXX as Version 14.0. There is no such thing as a CXX set as 15.0.
The new process employs few changes to the CXX between Versions 14.0 and 15.0, and the full CXX options are compatible between the two releases, except that options known only to Version 15.0 are ignored if Version 14.0 code is executing.
Changes at the database level are handled using the FORMAT that was built at Version 12.0. A CXX built and used by Version 14.0 has each database with a FORMAT of 1 or 2. If Version 15.0 code is executed with this CXX, when it opens a database the FORMAT 1 or 2 bases are convert to a FORMAT 3, and a message is issued about the conversion. A solution of support within Version 14.0 will cause it to recognize a database at FORMAT 3 and downgrade it to 2.
With these abilities, the CXX is removed as a roadblock between Datacom executing as Version 15.0 and Version 14.0. In fact, users using MUFPLEX may have different physical MUFs executing at different releases. This allows easy upgrades without an outage and also fallbacks without an outage.
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