Introduction to Database System
An audit trail

can be used to restore lost information
is used to make back-up copies
All of the listed here
is the recorded history of operations performed on a file

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Introduction to Database System
In a large DBMS

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

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