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When a memcached key does not directly refer to the "STA" or "DYN" fork of a system element but – for example – to derived quantities, the format of its name is free and can be arbitrary defined, provided that it is not already used.
Even though the name format is arbitrary, it is a good practice to adopt conventional extensions advisable to always use UPPERCASE and append an extension separated by a "_" (e.g. MYNEWVALMY-ARBITRARY-NAME_DAT). In any case, do not use the "_AUX" extension for a "free key".
To avoid the proliferation of extensions, try using the ones listed in the table below:
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