PPSC FPSC KPPSC BPSC SPSC Lecturer Computer Science Test 51

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There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
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Test Instructions:-
Test NameLecturer Computer Science 
SubjectComputer Science Test 51
Test TypeMCQs
Total Questions25
Total Time20 Minutes
Total Marks100

You have 20 minutes to pass to the quiz.

Lecturer Computer Science Online Test No. 51

1 / 25

An attribute is a _________ in a relation.

2 / 25

If database modifications occur while the transaction is still active, the transaction is said to use the ________technique.

3 / 25

Functional dependencies that have a time associated with them during which they are valid are called as.......

4 / 25

What is the method of specifying a primary key in a schema description?

5 / 25

In the _______ phase, the system replays updates of all transactions by scanning the log forward from the last checkpoint.

6 / 25

The current copy of the database is identified by a pointer, called __________, which is stored on disk.

7 / 25

Which of the following keywords is used beside the select clause to explicitly specify that duplicates are not removed?

8 / 25

What does the ―x‖ operator do in relational algebra?

9 / 25

What action does ⋈ operator perform in relational algebra:

10 / 25

The value of the data at a particular time is called as?

11 / 25

The ________ scheme uses a page table containing pointers to all pages; the page table itself and all updated pages are copied to a new location.

12 / 25

The process of making a normalized schema unnormalized is called as.........

13 / 25

The data that have a time interval associated with them during which they are valid are called as........

14 / 25

The actions which are played in the order while recording it is called __________ history.

15 / 25

In the _______ scheme, a transaction that wants to update the database first creates a complete copy of the database.

16 / 25

Choose the correct statement regarding superkeys:

17 / 25

A special redo-only log record is written to the log, where V1 is the value being restored to data item Xj during the rollback. These log records are sometimes called:

18 / 25

The log is a sequence of _______, recording all the update activities in the database.

19 / 25

If a transaction does not modify the database until it has committed, it is said to use the ________ technique.

20 / 25

To specify the foreign keys in relations referencing temporal data we need to specify......

21 / 25

.............using a log record sets the data item specified in the log record to the old value.

22 / 25

What is a foreign key?

23 / 25

What is an Instance of a Database?

24 / 25

Which of the following is the time of temporal data that record when a fact was recorded in a database?

25 / 25

Which of the following syntax of the basic query is correct?

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