CXXMAINT (Maintain Directory) › CXXMAINT FORMAT0102 (Base Level Full Version 12.0 Features) › When to Use

When to Use

When upgrading a Directory (CXX) from the previous release (Version 11.0, also known as r11) to Version 12.0, you are expected to run in the compatibility mode of the previous release for a few weeks and use only the Version 12.0 features that are compatible. This process ensures that, should a fallback be needed, the downgrade of the CXX can be simple and fast. This process is protected by a database level format. The use of FORMAT 1 is compatible between Versions 11.0 and 12.0. FORMAT 2 includes features supported by Version 12.0 alone. When the time for running in the compatibility mode of the previous release passes, all databases need to be set to FORMAT 2 to allow the additional Version 12.0 features not supported by the previous release. Those additional features include the following, in which Version 12.0:

• Activates key level status, where each key can be loaded or not loaded, allowing the use of the RETIX function with the MINIMAL option.
• Allows dynamic extend to be provided in cylinders or tracks, where using cylinders allows larger extent sizes.
• Allows a database index to include a Multi-Data Set Index area.