Introduction to Database System
In a large DBMS

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

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Introduction to Database System
In SQL, the CREATE TABLESPACE is used

to create a database trigger
to add/rename data files, to change storage
None of these
All of these
to create a place in the database for storage of scheme objects, rollback segments, and naming the data files to comprise the tablespace

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Introduction to Database System
With respect to data input, the most accurate description of batch control is

None of these
comparing to a pre-calculated figure the total of a data item summed across a batch records put into the system
All of these
dividing documents to be entered into batches
controlling the input of each input clerk

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