Let S1 and S2 be two stacks. S1 has capacity of 4 elements. S2 has capacity of 2 elements. S1 already has 4 elements: 100, 200, 300, and 400, whereas S2 is empty, as shown below.
| Stack S1 |
|---|
| 400 (Top) |
| 300 |
| 200 |
| 100 |
| Stack S2 |
|---|
Only the following three operations are available:
PushToS2: Pop the top element from S1 and push it on S2.
PushToS1: Pop the top element from S2 and push it on S1.
GenerateOutput: Pop the top element from S1 and output it to the user.
Note that the pop operation is not allowed on an empty stack and the push operation is not allowed on a full stack.
Which of the following output sequences can be generated by using the above operations?
Once the DBMS informs the user that a transaction has been successfully completed, its effect should persist even if the system crashes before all its changes are reflected on disk. This property is called
In the context of owner and weak entity sets in the ER (Entity-Relationship) data model, which one of the following statements is TRUE?
Which of the following file organizations is/are I/O efficient for the scan operation in DBMS?