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Database Redesign MCQ Questions and Answers

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In this section we provide lots of objective question of Database Redesign in Database Management System.

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1) Which of the following SQL statements are helpful in database redesign?

    Correlated subqueries only
    EXISTS/NOT EXISTS expressions only
    Both of the above are helpful
    None of the above are helpful.

Answer : C Discuss

2) Database redesign is not terribly difficult if the:

    database is structured.
    database is well-designed.
    database has no data.
    database is relatively small.

Answer : C Discuss

3) Which SQL-92 standard SQL command can be used to change a table name?

    RENAME TABLE
    CHANGE TABLE
    ALTER TABLE
    None of the above is correct.

Answer : D Discuss

4) The process of reading a database schema and producing a data model from that schema is known as:

    data modeling.
    database design.
    reverse engineering.
    None of the above is correct.

Answer : C Discuss

5) Before any changes to database structure are attempted one should first:

    clearly understand the current structure and contents of the database only.
    test any changes on a test database only.
    create a complete backup of the operational database only.
    All of the above should be done.

Answer : D Discuss

6) Which of the following modifications may not succeed?

    Changing a column data type from char to date
    Changing a column data type from numeric to char
    Both of the above actions should succeed.
    Neither of the above actions will succeed.

Answer : A Discuss

7) How can you find rows that do not match some specified condition?

    EXISTS
    Double use of NOT EXISTS
    NOT EXISTS
    None of the above is correct.

Answer : B Discuss

8) A regular subquery can be processed:

    from the top down.
    from the bottom up.
    by nesting.
    None of the above is correct.

Answer : B Discuss

9) The EXISTS keyword will be true if:

    any row in the subquery meets the condition only.
    all rows in the subquery fail the condition only.
    both of these two conditions are met.
    neither of these two conditions is met.

Answer : A Discuss

10) Changing cardinalities in a database is:

    a common database design task.
    a rare database design task, but does occur.
    a database design task that never occurs.
    is impossible to do, so a new database must be constructed and the data moved into it.

Answer : A Discuss

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