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
It is conceptually simple
where data is located
the size of the disk storage device

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Introduction to Database System
In a large DBMS

each user can "see" only a small part of the entire database
each user can access every sub¬schema
each subschema contains every field in the logical schema
all of the listed here

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