Introduction to Database System
Sort/report generators

none of the listed here
are faster than index/report generators
require more disk space than index/report generators
do not need to sort before generating a report

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Introduction to Database System
In a large DBMS

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

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