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. All of these Limit the set of permissible values that a field may assume. 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. All of these Limit the set of permissible values that a field may assume. ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design If a denormalization situation exists with a many-to-many or associative binary relationship, which of the following is true? All fields are stored in four relations. All fields are stored in one relation. All fields are stored in three relations. All fields are stored in two relations. All fields are stored in four relations. All fields are stored in one relation. All fields are stored in three relations. All fields are stored in two relations. ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design A secondary key is which of the following? Useful for denormalization decisions Determines the tablespace required Nonunique key Primary key Useful for denormalization decisions Determines the tablespace required Nonunique key Primary key ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Sequential retrieval on a primary key for sequential file storage has which of the following features? Impractical Very fast Slow Moderately fast Impractical Very fast Slow Moderately fast ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design In general, larger block sizes are used for online transaction processing applications and smaller block sizes are used for databases with a decision support or data warehousing system. True False True False ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Which of the following improves a query's processing time? Query one query within another. Use compatible data types. Write complex queries. Combine a table with itself. Query one query within another. Use compatible data types. Write complex queries. Combine a table with itself. ANSWER DOWNLOAD EXAMIANS APP
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