Physical Database Design What is the best data type definition for Oracle when a field is alphanumeric and has a length that can vary? VARCHAR2 NUMBER CHAR LONG VARCHAR2 NUMBER CHAR LONG ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design A secondary key is which of the following? Nonunique key Determines the tablespace required Useful for denormalization decisions Primary key Nonunique key Determines the tablespace required Useful for denormalization decisions Primary key ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design If a denormalization situation exists with a one-to-one binary relationship, which of the following is true? 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. All fields are stored in four relations. 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 is not a factor to consider when switching from small to large block size? The number of columns Random row access speed The length of all of the fields in a table row Block contention The number of columns Random row access speed The length of all of the fields in a table row Block contention ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design A bitmap index is an index on columns from two or more tables that come from the same domain of values. True False True False ANSWER DOWNLOAD EXAMIANS APP
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