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L.C.S              organizing data in a computer system

So let's go,

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But first (at the risk of repeating myself)
What is a computer system, how does it work?

This is the schema of a logically perfect system, the database is powered and updated from external movements only. The outputs of the system always come from the primary database.

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Even if it is beautiful, in practice it will be necessary to keep in the database, so - called "secondary" data calculated from primary data, in order to limit the volume of data to be kept in the system and of course, Improve the processing times.

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To smile a little: 50 years ago it was stored on perforated cards (well almost !) Then in 50 years to intergalactic air one will perhaps no longer need to keep secondary data !!

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Here is the schematic of the system as it exists in practice.

External movements feed the primary database,

which is the source of internal movements (generated by program)

that feed the database in secondary data.

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And one last !

Any Data Collection should be considered as a set
In the mathematical sense of the term.

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