Physical Database Design A rule of thumb for choosing indexes for a relational database includes which of the following? Indexes are more useful on smaller tables. Be careful indexing attributes that have null values. Do not specify a unique index for the primary key of each table. Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries. Indexes are more useful on smaller tables. Be careful indexing attributes that have null values. Do not specify a unique index for the primary key of each table. Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries. ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Which of the following are integrity controls that a DBMS may support? 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. Assume a default value in a field unless a user enters a value for that field. ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design A multidimensional database model is used most often in which of the following models? Relational Network Data warehouse Hierarchical Relational Network Data warehouse Hierarchical ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Hashing algorithm converts a primary key value into a record address. False True False True ANSWER DOWNLOAD EXAMIANS APP
Physical Database Design Sequential retrieval on a primary key for sequential file storage has which of the following features? Moderately fast Impractical Very fast Slow Moderately fast Impractical Very fast Slow 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 length of all of the fields in a table row Random row access speed Block contention The number of columns The length of all of the fields in a table row Random row access speed Block contention The number of columns ANSWER DOWNLOAD EXAMIANS APP
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