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Mastering Google App Engine by Mohsin Shafique Hijazee

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How is data stored?

Now that we know about row keys, column families and columns, we will gradually move towards examining this data model in more detail and understand how the data is actually stored. We will examine the logical storage and then dive into the actual structure, as it ends up on the disk.

The data that we presented in the earlier table had no order and was listed as it came to my mind. However, while storing, the data is always sorted by the row key. So now, the data will actually be stored like this:

 

Personal

professional

Key(name)

personal:lastname

personal:age

professional:company

professional:designation

Kim

Yong

32

Sony

Director

Mohsin

Hijazee

29

Sony

Senior Designer

Paul

Jefferson

39

LG

Sales ...

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