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 LONG VARCHAR2 CHAR NUMBER LONG VARCHAR2 CHAR ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design When storage space is scarce and physical records cannot span pages, creating multiple physical records from one logical relation will minimize wasted 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. All of these Limit the use of null values in some fields. 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. All of these Limit the use of null values in some fields. Limit the set of permissible values that a field may assume. ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Sequential retrieval on a primary key for sequential file storage has which of the following features? Impractical Moderately fast Very fast Slow Impractical Moderately fast Very fast Slow ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design A secondary key is which of the following? Useful for denormalization decisions Primary key Determines the tablespace required Nonunique key Useful for denormalization decisions Primary key Determines the tablespace required Nonunique key ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design What is the best data type definition for Oracle when a field is alphanumeric and has a fixed length? NUMBER CHAR VARCHAR2 LONG NUMBER CHAR VARCHAR2 LONG ANSWER DOWNLOAD EXAMIANS APP
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