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a. Using VARCHAR for all variable-length character columns b. Using the smallest possible numeric data type that holds the data values c. Using triggers whenever possible d. Using identical data types for primary keys and their matching foreign keys e. Using identical data types for all primary key columns 5. A query execution plan a. Describes how the DBMS will execute a query b. Is stored in the SQL cache c. Is created using the explain plan feature of the RDBMS d. Requires a plan table to hold the explain results e. Requires the use of a stored procedure 6. The query optimizer a. Creates a query execution plan in the plan table b. Determines the best way to execute an SQL statement c. May use statistics gathered from the database d. May use rules applied to the way the statement was written e. Can be cost-based or rule-based 7. In order to design proper queries, the developer should a. Know the characteristics of the data in the database b. Match data types in predicates c. Use hints as much as possible d. Avoid unnecessary tables and columns e. Maximize the number of rows in each result set 8. Table scans can be avoided by a. Including a WHERE clause that references an indexed column b. Using GROUP BY instead of DISTINCT c. Making sure that statistics are up to date
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d. Making at least one predicate references the leading column of an index e. Avoiding unnecessary columns 9. An index cannot be used when a. The WHERE clause references the second column of an index b. A LIKE clause references a comparison string that contains a wildcard (except in the rst position of the string) c. The NOT operator is used in a predicate d. An SQL function is included in a column comparison (except when they match a function-based index) e. The NOT EQUAL operator is used in a predicate 10. Considerations for using indexes include a. Placing indexes on all frequently updated columns b. Placing indexes on foreign key columns c. Avoiding overlapping indexes d. Creating indexes on columns that have only a few possible values e. Avoiding unique indexes 11. Tuning considerations for MySQL include a. Function-based indexes b. Hash indexes c. Clustering indexes d. Storage engine options e. Bit-map indexes 12. Tuning considerations for Oracle include a. Function-based indexes b. Hash indexes c. Clustering indexes d. Storage engine options e. Bit-map indexes 13. Tuning considerations for Microsoft SQL Server include a. Function-based indexes b. Hash indexes
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c. Clustering indexes d. Storage engine options e. Bit-map indexes 14. An explain plan in Oracle a. Requires the use of a plan table b. Contains a PLAN_ID to uniquely identify it c. Can be viewed using Enterprise Manager
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d. Can be viewed with SQL by selecting it from the plan table e. Is created using the CREATE PLAN statement 15. An execution plan in Microsoft SQL Server a. Requires the use of a plan table b. Can be displayed using an option in SQL Query Analyzer c. Displays the execution plan in a text format d. Displays the execution plan in a graphical format e. Can be viewed with SQL by selecting it from the plan table 16. When tuning INSERT statements, one should consider a. Index maintenance b. Row expansion c. The CASCADE option d. Adequate free space e. Query rewrites 17. When tuning UPDATE statements, one should consider a. Index maintenance b. Row expansion c. The CASCADE option d. Adequate free space e. Query rewrites 18. When tuning DELETE statements, one should consider a. Index maintenance b. Row expansion c. The CASCADE option
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