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Choose the correct responses to each of the multiple-choice questions. Note that there may be more than one correct response to each question. 1. A transaction a. May be partially processed b. May not be partially processed
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c. Changes the database from one consistent state to another d. Is sometimes called a unit of work e. Has properties described by the ACID acronym 2. The A in the ACID acronym stands for a. Automatically b. Auxiliary c. Atomicity d. Augmented e. Availability 3. The C in the ACID acronym stands for a. Correlated b. Consistency c. Committed d. Calculated e. Consolidated 4. The I in the ACID acronym stands for a. Integration b. Immediacy c. Iconic d. Isolation e. Information 5. The D in the ACID acronym stands for a. Durability b. Dedication c. Duality d. Database e. Distribution 6. The process that backs out changes made by a failed transaction is called a. Transaction logging b. Commit c. Rollback
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d. Recovery e. Savepoint creation 7. The process that makes transaction changes permanent is called a. Transaction logging b. Commit c. Rollback d. Savepoint creation e. Saving the transaction 8. Support for transactions in relational databases includes a. Identifying the beginning of each transaction b. Identifying the end of each transaction c. Distributed database management d. Periodic database backups e. The transaction log 9. Microsoft SQL Server supports the following transaction modes: a. Autocommit b. Automatic c. Durable d. Explicit e. Implicit 10. Oracle supports the following transaction modes: a. Autocommit b. Automatic c. Durable d. Explicit e. Implicit 11. In implicit transaction mode in Microsoft SQL Server, a new transaction is started by a. Connecting to the database b. A COMMIT statement c. A ROLLBACK statement
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d. An INSERT statement e. A SELECT statement
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12. In implicit transaction mode in Oracle, a new transaction is started by a. Connecting to the database b. A Commit statement c. A Rollback statement d. An INSERT statement e. A SELECT statement 13. The SQL statements used to manage transactions in Microsoft SQL Server and Sybase Adaptive Server include a. BEGIN TRANSACTION b. END TRANSACTION c. COMMIT d. ROLLBACK e. SET AUTOCOMMIT 14. SQL statements used to manage transactions in Oracle are a. BEGIN TRANSACTION b. END TRANSACTION c. COMMIT d. ROLLBACK e. SET AUTOCOMMIT 15. In MySQL, transaction support a. Only applies to the ISAM and MyISAM storage engines b. Only applies to the InnoDB and BDB storage engines c. Includes autocommit, implicit, and explicit modes d. Includes autocommit and implicit modes e. Includes autocommit and explicit modes 16. SQL statements used to manage transactions in DB2 UDB are a. BEGIN TRANSACTION b. END TRANSACTION
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c. COMMIT d. ROLLBACK e. SAVEPOINT 17. The amount of data held by a lock (lock granularity) can be a a. Database b. Table c. Row d. Column e. Block or page 18. The concurrent update problem a. Is a consequence of simultaneous data sharing b. Cannot occur when AUTOCOMMIT is set to ON c. Is the reason that transaction locking must be supported d. Occurs when two database users submit con icting SELECT statements e. Occurs when two database users make con icting updates to the same data 19. A lock a. Is a control placed on data to reserve it so that the user may update it b. Is usually released when a COMMIT or ROLLBACK takes place c. Has a timeout set in DB2 and some other RDBMS products d. May cause contention when other users attempt to update locked data e. May have levels and an escalation protocol in some RDBMS products 20. A deadlock a. Is a lock that has timed out and is therefore no longer needed b. Occurs when two database users each request a lock on data that is locked by the other c. Can theoretically put two or more users in an endless lock wait state d. May be resolved by deadlock detection on some RDBMSs e. May be resolved by lock timeouts on some RDBMSs
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