Physical Database Design What is the best data type definition for Oracle when a field is alphanumeric and has a length that can vary? NUMBER VARCHAR2 LONG CHAR NUMBER VARCHAR2 LONG CHAR ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design An extent is a contiguous section of disk storage space. False True False True ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Which of the following are integrity controls that a DBMS may support? Assume a default value in a field unless a user enters a value for that field. Limit the use of null values in some fields. Limit the set of permissible values that a field may assume. All of these Assume a default value in a field unless a user enters a value for that field. Limit the use of null values in some fields. Limit the set of permissible values that a field may assume. All of these ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design A rule of thumb for choosing indexes for a relational database includes which of the following? Be careful indexing attributes that have null values. Indexes are more useful on smaller tables. Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries. Do not specify a unique index for the primary key of each table. Be careful indexing attributes that have null values. Indexes are more useful on smaller tables. Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries. Do not specify a unique index for the primary key of each table. ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Which of the following improves a query's processing time? Combine a table with itself. Use compatible data types. Query one query within another. Write complex queries. Combine a table with itself. Use compatible data types. Query one query within another. Write complex queries. ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Distributing the columns of a table into several separate physical records is known as horizontal partitioning. False True False True ANSWER DOWNLOAD EXAMIANS APP
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