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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 6 Microsoft SQL Server supports the following transaction modes: A Autocommit B Automatic C Durable D Explicit E Implicit 7 Oracle supports the following transaction modes: A Autocommit B Automatic C Durable D Explicit E Implicit 8 The SQL statements (commands) that end a transaction are A SET AUTOCOMMIT B BEGIN TRANSACTION (in SQL Server) C COMMIT D ROLLBACK E SAVEPOINT 9 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 conflicting SELECT statements E Occurs when two database users make conflicting updates to the same data
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10 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 11 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
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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 12 Performance tuning A Is a never-ending process B Should be used on each query until no more improvement can be realized C Should be used only on queries that fail to conform to performance requirements D Involves not only SQL tuning but also CPU, file system I/O, and memory
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E Should be requirements based 13 SQL query tuning A Can be done in the same way for all relational database systems B Usually involves using an explain plan facility C Always involves placing SQL statements in a stored procedure D Applies only to SQL SELECT statements E Requires detailed knowledge of the RDBMS on which the query is to be run
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14 General SQL tuning tips include which of the following A Avoid table scans on large tables B Use an index whenever possible C Use an ORDER BY clause whenever possible D Use a WHERE clause to filter rows whenever possible E Use views whenever possible 15 SQL practices that obviate the use of an index are A Use of a WHERE clause B Use of a NOT operator C Use of table joins D Use of the NOT EQUAL operator E Use of wildcards in the first column of LIKE comparison strings 16 Indexes work well at filtering rows when A They are very selective B The selectivity ratio is very high C The selectivity ratio is very low D They are unique E They are not unique 17 The main performance considerations for INSERT statements are A Row expansion B Index maintenance C Free space usage D Subquery tuning E Any very large tables that are involved
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18 The main performance considerations for UPDATE statements are A Row expansion B Index maintenance C Free space usage D Subquery tuning E Any very large tables that are involved 19 A change control process A Can prevent programming errors from being placed into production B May also be called change management C Helps with understanding when changes may be installed D Provides a log of all changes made E Can allow defective software versions to be backed out 20 Common features of change control processes include which of the following A Transaction support B Version numbering C Deadlock prevention D Release numbering E Prioritization
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