Best DB2 Interview Questions (2021)

Introduction

It is essential to consider the various DB2 interview questions. At the same time, we prepare for the DB2 Interview, as this prepares you for the conceptual answers expected from you during the interview by the employer. 

DB2 Interview Questions

1. What is the meaning of DB2? 

DB2 is a database management product that delivers advanced data management and analytical capability for managing transactions. 

2. What is the use of DB2? 

DB2 is used to give actionable insights, deliver high performance, reliability, and data availability by utilizing Linux, Unix, and Windows operating systems. 

3. What is meant by the access path? 

It is essential to know the access path. An access path provides the method of how the data will be accessed. 

4. What are the Data types available? 

The various data types accessible are Integer, Smallint, Float, Varchar, Date, Time, and Decimal. 

5. What are the essential components of DB2? 

There are 4-major components of DB2: locking services, distributed data facility, locking services, and system services. 

6. What does Data Warehousing use? 

To run in multiple environments like private cloud, on-premise, and various public clouds, whether managed and unmanaged, DB2 Warehouse uses Docker containers. DB2 Warehouse can be employed as software, appliance, Intel x86, mainframe, and Linux platforms. 

7. What is meant by SQL Communication Area? 

An SQLCA is a collection of variables that are updated after the implementation of SQL statements. Only one SQLCA is needed for an application that contains executable SQL statements. 

8. What is DB2 on a cloud? 

It is also known as “dash DB for Transactions”, it is a cloud SQL database that is fully managed with a high-availability option that has 99.99 per cent uptime SLA. DB2 on the cloud presents independent scaling of computing and storage and rolling security updates. 

9. How to locate the number of rows in a DB2 table? 

The user has to use SELECT COUNT (*) on the DB2 query to locate the rows in the DB2 table. 

10. Explain DB2 isolation levels: 

The DB2 isolation levels are Cursor Stability (CS), Red Stability (RS), Repeatable Read (RR), and Uncommitted Read (UR). UR is used to get access to read-only queries and read-only tables. CS can lock or unlock currently referred rows by the cursor. RS enables the result set stability and unlocks the rows that don’t coordinate with query predictions. RR, known for higher isolation level, ensures the data’s integrity for the complete duration of the entry. 

11. Describe check constraint. 

Check constraint enables the insertion or updating of the table, which ensures data integrity by considering what values are granted permission. 

12. What does the buffer manager do? 

The buffer manager uses some extremely sophisticated buffering techniques to reduce the amount of physical output and input. He also transfers data between an external medium and virtual storage. 

13. Describe the buffer pool: 

The buffer pool satisfies the buffering requirements of one or more than one table indexes or spaces. It can be created from either 4Kor 32K pages. 

14. What is the DB2 aggregate function? 

An aggregate function is a part of DB2 functions that perform on the structure of values and gives a single value. 

15. What is meant by storage group (STOGROUP)? 

STOGROUP should be used by tablespaces and index spaces of the database, also known as named collection of DASD volumes. 

16. Can a program have more than one cursor? 

Yes, the program can possess more than one cursor open at any one time. 

17. Define the value function purpose:  

Two tasks can be performed using the value function: 

-To avoid negative SQLCODEs by taking care of Nulls and 0s in the computation. 

-Nulls can be substituted for numeric values used in the computation. 

18. Explain UNION and UNION ALL: 

UNION and UNION ALL are used to collaborate the results provided by multiple SELECT statements. UNION eliminates duplicates present in the table, whereas UNION ALL retains the duplicates. 

19. What is ACQUIRE/RELEASE in BIND? 

This happens when DB2 acquires or releases locks on the tablespaces and table, including intent locks. 

20. Define COPY PENDING status? 

COPY PENDING status means an image copy to be taken still pending, and therefore, till that time table cannot be updated. To withdraw this status, one can get the image copy. REPAIR command can be used to eradicate the COPY PENDING status. 

21. What is the amount of clustering and non-clustering indexes that can be defined? 

Even if a table has many indexes, one clustering index can be defined, and many non-clustered indexes can be defined. 

22. Describe the four environments that access DB2: 

IMS, CICS, TSO, and BATCH are the four environments that can access DB2. 

23. Distinguish between segmented, simple, and partitioned tablespaces: 

A simple tablespace and a segmented tablespace are used to accommodate more than one table. Records are held in a single statement present in the segments held in the pages of segmented tablespaces. 

24. What do you mean by a recovery log? 

A recovery log is used to identify all the changes formulated in the database. A recovery log can recover the sequence of events that had taken place before the failure when the system failure had occurred. 

Conclusion

Hence the above DB2 interview questions and answers can be looked upon while you approach an interview. 

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