DBMS-Physical Data Organization
DBMS-Physical Data Organization
51. Which of the following file is created by extracting data to prepare a report?
- report file
- master file
- transaction file
- all of these
52. DASD stands for:
- Discrete Application Scanning Devices
- Double Amplification Switching Devices
- Direct Access Storage Devices
- None of these
54. Employee ID, Supplier ID, Model No and so on are examples of:
- primary keys
- fileds
- unique record identifier
- all of these
55. Which of the following is DASD ?
- magnetic tape
- magnetic disk
- zip disk
- DAT Cartridge.
56. Which of the following is sequential access storage device?
- hard disks
- magnetic tape
- jaz disk
- floppy disk.
57. In primary data storage area:
- records are written when an indexed-sequential file is originally created
- record are written by the user's programs
- records are written in data blocks in ascending key sequence
- all of these.
58. Which storage media does not permit a record to be read and written in the same place?
- magnetic disk
- hard disk
- magnetic tape
- none of these
59. Data transfer rate is the time:
- from when a read or write request is issued to when data transfer begins
- amount of time required to transfer data from the disk to or from main memory
- required to electronically activate the read/write head over the disk surface where data transfer is to take place
- none of these
60. Optical storage is a:
- high-speed direct access storage device
- low-speed direct access storage device
- medium-speed direct access storage device
- high-speed sequential access storage device.