Introduction to Database System
A data dictionary doesn't provide information about:

It allows a many-to-many relationship
It will be the dominant data base of the future
the size of the disk storage device
where data is located
It is conceptually simple

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Introduction to Database System
A logical schema

is a standard way of organizing information into accessible parts
is the entire database
None of these
All of these
describes how data is actually stored on disk

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