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DB2 Interview Questions: DB2 is a popular relational database management system used by organizations around the world. As such, many employers seek out professionals with DB2 expertise to join their teams. To help job seekers prepare for DB2 interviews, we’ve compiled a list of the top 50 DB2 interview questions and answers, including the Latest DB2 Technical Interview Questions. These questions cover a range of topics, from the basics of DB2 to more complex concepts such as performance tuning and security. In addition, we’ve included DB2 Interview Questions for Freshers who are new to the field. Whether you’re a seasoned DB2 professional or just starting out, these Latest DB2 Interview Questions and answers will help you succeed in your next DB2 interview.
★★ Latest Technical Interview Questions ★★
Top 50 DB2 Interview Questions and Answers 2023
1. What is DB2?
Ans: DB2 is a relational database management system (RDBMS) that is used to manage and store data.
2. What are the different types of DB2 databases?
Ans: There are two types of DB2 databases: traditional and universal.
3. What is a tablespace?
Ans: A tablespace is a storage structure that contains tables, indexes, and other database objects.
4. What is a buffer pool?
Ans: A buffer pool is a storage area in memory that holds pages of data retrieved from a tablespace.
5. What is a page?
Ans: A page is the smallest unit of data that can be read from or written to a buffer pool.
6. What is a data page?
Ans: A data page is a page that contains actual data from a table or index.
7. What is a catalog?
Ans: A catalog is a set of tables and views that contain metadata about a DB2 database.
8. What is a schema?
Ans: A schema is a collection of database objects that are owned by a particular user.
9. What is a lock?
Ans: A lock is a mechanism that prevents two or more transactions from accessing the same data at the same time.
10. What is a deadlock?
Ans: A deadlock is a situation where two or more transactions are waiting for each other to release locks.
11. What is a transaction?
Ans: A transaction is a sequence of one or more operations that are performed as a single unit of work.
12. What is a commit?
Ans: A commit is an operation that makes all changes made in a transaction permanent.
13. What is a rollback?
Ans: A rollback is an operation that undoes all changes made in a transaction.
14. What is a savepoint?
Ans: A savepoint is a marker that allows you to roll back to a specific point in a transaction.
15. What is a cursor?
Ans: A cursor is a database object that is used to retrieve data from a result set one row at a time.
16. What is a trigger?
Ans: A trigger is a database object that is automatically executed in response to certain events, such as a table update.
17. What is a stored procedure?
Ans: A stored procedure is a set of SQL statements that are stored in the database and can be executed as a single unit.
18. What is an index?
Ans: An index is a database object that is used to speed up data retrieval by providing a quick way to locate data in a table.
19. What is a clustered index?
Ans: A clustered index is an index that determines the physical order of the data in a table.
20. What is a non-clustered index?
Ans: A non-clustered index is an index that does not affect the physical order of the data in a table.
21. What is normalization?
Ans: Normalization is a process of organizing data in a database to minimize redundancy and improve data integrity.
22. What is denormalization?
Ans: Denormalization is a process of adding redundancy to a database to improve performance.
23. What is a join?
Ans: A join is a SQL operation that combines rows from two or more tables based on a common field.
24. What is an inner join?
Ans: An inner join is a join that only returns rows where there is a match in both tables.
25. What is an outer join?
Ans: An outer join is a join that returns all rows from one table and the matching rows from another table.
26. What is a left outer join?
Ans: A left outer join is a join that returns all rows from the left table and the matching rows from the right table. If there is no match in the right table, the result will contain NULL values for the right table’s columns.
27. What is a right outer join?
Ans: A right outer join is a join that returns all rows from the right table and the matching rows from the left table. If there is no match in the left table, the result will contain NULL values for the left table’s columns.
28. What is a full outer join?
Ans: A full outer join is a join that returns all rows from both tables, including the non-matching rows. If there is no match in one of the tables, the result will contain NULL values for the non-matching table’s columns.
29. What is a subquery?
Ans: A subquery is a SQL query that is embedded within another query.
30. What is a correlated subquery?
Ans: A correlated subquery is a subquery that refers to a column from the outer query.
31. What is a scalar subquery?
Ans: A scalar subquery is a subquery that returns a single value.
32. What is a group by clause?
Ans: A group by clause is a SQL clause that is used to group rows based on one or more columns.
33. What is a having clause?
Ans: A having clause is a SQL clause that is used to filter groups based on aggregate functions.
34. What is a union?
Ans: A union is a SQL operation that combines the result sets of two or more SELECT statements.
35. What is a union all?
Ans: A union all is a variation of the union operation that does not remove duplicates.
36. What is a subselect?
Ans: A subselect is a SQL select statement that is embedded within another statement, such as a SELECT, UPDATE, or DELETE statement.
37. What is a correlated subselect?
Ans: A correlated subselect is a subselect that refers to a column from the outer statement.
38. What is a scalar subselect?
Ans: A scalar subselect is a subselect that returns a single value.
39. What is a common table expression (CTE)?
Ans: A common table expression (CTE) is a temporary named result set that can be referenced within a SQL statement.
40. What is a recursive CTE?
Ans: A recursive CTE is a common table expression that references itself.
41. What is a materialized query table (MQT)?
Ans: A materialized query table (MQT) is a precomputed result set that is stored in the database and can be referenced by SQL statements.
42. What is the query to delete all the rows from a table in DB2?
Ans:
| DELETE * FROM table–name |
43. What is a read-only view?
Ans: A read-only view is a view that cannot be used to modify the underlying data.
44. What is a updatable view?
Ans: An updatable view is a view that can be used to modify the underlying data.
45. What is a system catalog?
Ans: A system catalog is a set of tables and views that contain metadata about a DB2 database.
46. What is a recovery log?
Ans: A recovery log is a database object that is used to restore a database to a previous state in the event of a failure.
47. What is a backup?
Ans: A backup is a copy of a database that can be used to restore the database in the event of a failure.
48. What is a restore?
Ans: A restore is an operation that replaces a damaged or lost database with a backup.
49. What is a checkpoint?
Ans: A checkpoint is a point in time when DB2 writes all modified data to disk and updates the recovery log.
50. Explain how DB2 determines the appropriate lock size to use, considering the fact that there are various sizes of locks available?
Ans: Below are the three methods used by DB2 to determine the lock size
- First, it can be based on the lock size specified during the creation of a new TABLESPACE
- Second, the lock size can be directed by programming
- Lastly, if the lock size is set to ANY, DB2 will typically choose the lock size of PAGE.
After reviewing the Top 50 DB2 Interview Questions and Answers, it is clear that a solid understanding of DB2 concepts and functionality is crucial for success in DB2 interviews. We encourage you to stay up-to-date with the latest software insights by following freshersnow.com daily.