In order to reduce the overhead in retrieving the records from the storage space we use

Related MCQs

• Data Redundancy increases the cost of storing and retrieving data.
• A unit of storage that can store one or more records in a hash file organization is denoted as
• The unit of storage that can store one are more records in a hash file organization are
•                              policy allows multiple updates to accumulate on a block before it is output to stable storage, which can reduce the number of output operations greatly for frequently updated blocks.
• The magnetic storage chip used to provide non-volatile direct access storage of data and that have no moving parts are known as
• A              file system is software that enables multiple computers to share file storage while maintaining consistent space allocation and file content.
• In ordered indices the file containing the records is sequentially ordered, a ___________ is an index whose search key also defines the sequential order of the file.
• To identify the deleted records we use the
• The                    is the fastest and most costly form of storage, which is relatively small; its use is managed by the computer system hardware.
• View the Exhibit and examine the structure of the EMPLOYEES and DEPARTMENTS tables. Which SET operator would you use in the blank space in the following SQL statement to list the departments where all the employees have managers? SELECT department_id FROM departments ____ SELECT department_id FROM employees WHERE manager_id IS NULL;