Oracle OCP 9i DBA Interview Questions!

⟩ Oracle OCP 9i DBA interview questions!

1. What is an oracle instance?

2. What is a view?

3. What is referential integrity?

4. Name the data dictionary that stores user-defined constraints?

5. What is a collection of privileges?

6. What is a snapshot?

7. What is a synonym?

8. What is a cursor?

9. What is a sequence?

10. What is a trigger?

11. What is an exception?

12. What is a partition of table?

13. What are pseudo-columns in SQL? Provide examples.

14. What are the Data Control statements?

15. What is a schema?

16. What is a type?

17. What is a data model?

18. What is a relation?

19. Advantages of redo log files?

20. What is an Archiver?

21. What is a database buffer cache?

22. What are the background processes in Oracle?

23. %type and %rowtype are attributes for…?

24. What are the steps in a two-phase commit?

25. What is a union, intersect, minus?

26. What is a join, explain the types of joins?

27. What is a co-related sub-query?

28. ODBC stands for…?

29. Data-type used to work with integers is?

30. Describe data models?

31. Describe the Normalization principles?

32. What are the types of Normalization?

33. What is de-normalization?

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Explain Which two statements are true regarding working with dates? (Choose two.) A. The default internal storage of dates is in the numeric format B. The default internal storage of dates is in the character format C. The RR date format automatically calculates the century from the SYSDATE function and does not allow the user to enter the century D. The RR date format automatically calculates the century from the SYSDATE function but allows the user to enter the century if required?

Suppose you need to generate a list of all customer last names with their credit limits from the CUSTOMERS table. Those customers who do not have a credit limit should appear last in the list. Which two queries would achieve the required result? (Choose two.) A. SELECT cust_last_name,cust_credit_limit FROM customers ORDER BY cust_credit_limit DESC; B. SELECT cust_last_name,cust_credit_limit FROM customers ORDER BY cust_credit_limit; C. SELECT cust_last_name,cust_credit_limit FROM customers ORDER BY cust_credit_limit NULLS LAST; D. SELECT cust_last_name,cust_credit_limit FROM customers ORDER BY cust_last_name,cust_credit_limit NULLS LAST;

Which two statements are true regarding views? (Choose two.) A. A subquery that defines a view cannot include the GROUP BY clause B. A view is created with the subquery having the DISTINCT keyword can be updated C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updated D. A Data Manipulation Language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table

Explain Which two statements are true regarding views? (Choose two.) A. A subquery that defines a view cannot include the GROUP BY clause B. A view is created with the subquery having the DISTINCT keyword can be updated C. A view that is created with the subquery having the pseudo column ROWNUM keyword cannot be updated D. A Data Manipulation Language (DML) operation can be performed on a view that is created with the subquery having all the NOT NULL columns of a table

Explain Which statements are correct regarding indexes? (Choose all that apply.) A. When a table is dropped, the corresponding indexes are automatically dropped B. A FOREIGN KEY constraint on a column in a table automatically creates a nonunique key C. A nondeferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique index D. For each data manipulation language operation performed, the corresponding indexes are automatically updated

Explain Which two statements are true about sequences created in a single instance database? (Choose two.) A. The numbers generated by a sequence can be used only for one table B. DELETE <sequencename> would remove a sequence from the database C. CURRVAL is used to refer to the last sequence number that has been generated D. When the MAXVALUE limit for a sequence for reached, you can increase the MAXVALUE limit by using the ALTER SEQUENCE statement E. When a database instance shuts down abnormally, the sequence numbers that have been cached but not used would be available once again when the database instance is restarted

Explain Which two statements are true regarding constraints? (Choose two.) A. A foreign key cannot contain NULL values B. A columns with the UNIQUE constraint can contain NULL values C. A constraint is enforced only for the INSERT operation on a table D. A constraint can be disabled even if the constraint column contains data E. All constraints can be defined at the column level as well as the table level

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