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
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You have 20 minutes to pass to the quiz.

You have 20 minutes to pass to the quiz.


Lecturer Computer Science Online Test No. 51

1 / 25

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

2 / 25

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

3 / 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:

4 / 25

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

5 / 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.

6 / 25

What action does ⋈ operator perform in relational algebra:

7 / 25

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

8 / 25

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

9 / 25

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

10 / 25

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

11 / 25

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

12 / 25

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

13 / 25

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

14 / 25

What is an Instance of a Database?

15 / 25

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

16 / 25

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

17 / 25

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

18 / 25

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

19 / 25

What is a foreign key?

20 / 25

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

21 / 25

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

22 / 25

An attribute is a _________ in a relation.

23 / 25

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

24 / 25

Choose the correct statement regarding superkeys:

25 / 25

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

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