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68. A result set is a. A pointer into a cursor b. A method to analyze the performance of SQL statements c. The same as a cursor d. A buffer that holds rows retrieved from the database e. The collection of rows returned by a database query 69. Before rows may be fetched from a cursor, the cursor must rst be a. Opened b. Closed c. Deallocated d. Declared e. Committed 70. Cursors are a. Included in the Oracle PL/SQL language b. Included in the Sybase Transact-SQL language c. Included in the Microsoft Transact-SQL language d. Intended to overcome the mismatch between the way object-oriented languages and relational databases handle query results e. Intended to overcome the mismatch between the way procedural languages and relational databases handle query results 71. The cursor name is included in a. The OPEN statement b. The FETCH statement c. The CLOSE statement d. The DECLARE CURSOR statement e. The SELECT statement 72. A cursor OPEN statement a. Must include an INTO clause b. Must include the cursor name c. Must include the table name(s) d. May cause the query to be run and some rows placed in the result set e. Always causes the query to be run and the result set to be lled with data
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73. ODBC is a. A Microsoft standard
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b. Independent of any particular language, operating system, or DBMS c. A standard API for connecting to DBMSs d. Flexible in handling proprietary SQL e. Used by Java programs 74. JDBC is a. A Microsoft standard b. Independent of any particular language, operating system, or DBMS c. A standard API for connecting to DBMSs d. Flexible in handling proprietary SQL e. Used by Java programs 75. A trigger is a. Written in a nonprocedural language b. Written in a procedural language c. Stored in the database d. Executed only when called e. Executed automatically based on an event in the database 76. A stored procedure is a. Written in a nonprocedural language b. Written in a procedural language c. Stored in the database d. Executed only when called e. Executed automatically based on an event in the database 77. Performance requirements a. Provide a way to know when to stop tweaking a query b. Are best when they contain complex criteria c. Should be set after the SQL statements are tuned d. Provide a way to identify statements that need tuning e. Are developed just to make the auditors happy
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78. Disk reads and writes can be minimized by a. Placing all the database les on one disk drive b. Putting the entire database in memory c. Spreading les across all available disk drives d. Allocating buffers of suf cient size e. Adding indexes for all the important table columns 79. Ef cient table design includes a. Using identical data types for primary keys and their matching foreign keys b. Using identical data types for all primary key columns c. Using triggers whenever possible d. Using VARCHAR for all variable-length character columns e. Using the smallest possible numeric data type that holds the data values 80. The query optimizer a. May use statistics gathered from the database b. May use rules applied to the way the statement was written c. Can be cost-based or rule-based d. Creates a query execution plan in the plan table e. Determines the best way to execute an SQL statement 81. Table scans can be avoided by a. Making sure at least one predicate references the leading column of an index b. Avoiding unnecessary columns c. Using GROUP BY instead of DISTINCT d. Including a WHERE clause that references an indexed column e. Making sure that statistics are up to date 82. An index cannot be used when a. The NOT EQUAL operator is used in a predicate b. The NOT operator is used in a predicate c. An SQL function is included in a column comparison (except when they match a function-based index)
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