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Which of the following statements is/are True regarding some advantages that an objectoriented DBMS (OODBMS) offers over a relational database ?

I. An OODBMS avoids the “impedance mismatch” problem.

II. An OODBMS avoids the “phantom” problem.

III. An OODBMS provides higher performance concurrency control than most relational databases.

IV. An OODBMS provides faster access to individual data objects once they have been read from disk.

  1. $II$ and $III$ only
  2. $I$ and $IV$ only
  3. $I, II,$ and $III$ only
  4. $I, III$ and $IV$ only
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Ans: B

I. An OODBMS avoids the “impedance mismatch” problem. TRUE

II. An OODBMS avoids the “phantom” problem. FALSE

III. An OODBMS provides higher performance concurrency control than most relational databases. FALSE

IV. An OODBMS provides faster access to individual data objects once they have been read from disk TRUE

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