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

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

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Introduction to Database System
In a large DBMS

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

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