Introduction to Database System
In a large DBMS

each user can access every sub¬schema
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

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Introduction to Database System
A race condition occurs when

Both of the listed here
two users of the DBMS are interacting with different files at the same time
None of the listed here
Two concurrent activities interact to cause a processing error

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