Deck 10: File Concepts
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ملء الشاشة (f)
Deck 10: File Concepts
1
22.When processing records sequentially
A)The records are processed one at a time starting with the first record.
B)The fields are processed one at a time starting with the first field.
C)The records are processed one at a time starting anywhere in the file.
D)The fields are read one at a time starting anywhere in the record.
A)The records are processed one at a time starting with the first record.
B)The fields are processed one at a time starting with the first field.
C)The records are processed one at a time starting anywhere in the file.
D)The fields are read one at a time starting anywhere in the record.
A
2
16.Files may be processed:
A)Sequentially.
B)Randomly through the use of linked lists.
C)Randomly through the use of binary trees.
D)All of the above.
E)None of the above.
A)Sequentially.
B)Randomly through the use of linked lists.
C)Randomly through the use of binary trees.
D)All of the above.
E)None of the above.
D
3
6.Random access files may process records randomly or sequentially.
True
4
9.It is important to design the record with care to save storage space.
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5
7.A secondary key is essentially the same as a primary key.
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6
5.The EOF is a marker after the last record in a file.
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7
4.A systems flowchart uses the same symbols as an algorithmic flowchart.
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8
14.A data record dictionary:
A)Is a list of the terms used in the solution.
B)Is a list of fields in a record and their attributes.
C)Is a list of the data found in the records.
D)Is a list of records in a file and their attributes.
A)Is a list of the terms used in the solution.
B)Is a list of fields in a record and their attributes.
C)Is a list of the data found in the records.
D)Is a list of records in a file and their attributes.
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9
1.Sequential access file may be processed either randomly or sequentially.
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10
19.The secondary key
A)Is unique.
B)May be used to access records.
C)Is used within the record only.
D)Is the same as the primary key.
A)Is unique.
B)May be used to access records.
C)Is used within the record only.
D)Is the same as the primary key.
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11
15.The primer read is the first record that:
A)Is read as the last instruction in the loop.
B)Is read after the loop ends.
C)Is read as the first instruction in the loop.
D)Is read before the loop begins.
A)Is read as the last instruction in the loop.
B)Is read after the loop ends.
C)Is read as the first instruction in the loop.
D)Is read before the loop begins.
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12
3.The logical file number is a reference number used in the solution.
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13
10.A systems flowchart shows the flow of data between the pieces of hardware.
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14
12.A primary key:
A)Is required for all types of files.
B)Should be unique.
C)Is used in conjunction with a secondary key and is less important than the secondary key.
D)Is the only field used to sort the records of a file.
A)Is required for all types of files.
B)Should be unique.
C)Is used in conjunction with a secondary key and is less important than the secondary key.
D)Is the only field used to sort the records of a file.
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15
13.A systems flowchart:
A)Shows the data flow through the complete hardware system.
B)Shows the data flow through the program instructions.
C)Shows the data flow through the modules.
D)Shows the data flow through the internal memory.
A)Shows the data flow through the complete hardware system.
B)Shows the data flow through the program instructions.
C)Shows the data flow through the modules.
D)Shows the data flow through the internal memory.
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16
8.Instructions such as OPEN and READ uses the LFN within the solution since that number designates the file in use.
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17
2.Sorting is the processing categorizing the data.
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18
17.Buffers are
A)Allow data to be transferred from one storage device to another storage device.
B)Are only used when processing files sequentially.
C)Data holding areas in the computer.
D)All of the above.
E)None of the above.
A)Allow data to be transferred from one storage device to another storage device.
B)Are only used when processing files sequentially.
C)Data holding areas in the computer.
D)All of the above.
E)None of the above.
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19
21.The fields of a record
A)Contain like data for all records.
B)Contain different pieces and number of data items for each record.
C)Contain only character or string data.
D)Contain only numeric data.
A)Contain like data for all records.
B)Contain different pieces and number of data items for each record.
C)Contain only character or string data.
D)Contain only numeric data.
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20
11.A random access file:
A)Can be accessed sequentially.
B)Uses many methods of accessing records including linked lists and binary trees.
C)Can access any record without reading through any other records.
D)All of the above.
A)Can be accessed sequentially.
B)Uses many methods of accessing records including linked lists and binary trees.
C)Can access any record without reading through any other records.
D)All of the above.
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21
23.Sequential files
A)Start with a given record number and continues until the file is closed.
B)Start with the first record and end with and EOF.
C)Start with the first record and ends with a file closed instruction.
D)All of the above.
A)Start with a given record number and continues until the file is closed.
B)Start with the first record and end with and EOF.
C)Start with the first record and ends with a file closed instruction.
D)All of the above.
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22
24.Sequential files can be processed and maintained
A)As efficiently as random accessed files.
B)More efficiently as random access files.
C)Less efficiently as random access files.
D)As efficiently as random accessed files in some applications.
A)As efficiently as random accessed files.
B)More efficiently as random access files.
C)Less efficiently as random access files.
D)As efficiently as random accessed files in some applications.
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