DB2 MCQs and Answers With Explanation – DB2 is a relational database management system (RDBMS) developed by IBM that is widely used in enterprise applications. It provides robust features and capabilities for managing and manipulating large amounts of data in a secure and reliable manner. As with any technology, it is important to have a solid understanding of the fundamentals in order to make the most out of its capabilities. Now follow these DB2 Multiple Choice Questions and be prepared for your interview.
DB2 MCQs
In this set of 50 DB2 Multi Choice Quiz, we cover a range of topics related to DB2, including data types, constraints, transactions, backups, and security. These DB2 MCQs With Answers are designed to test your knowledge of the basics of DB2 and to help you better understand how to work with this powerful database management system.
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DB2 Multiple Choice Questions and Answers
| Quiz Name | DB2 |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 50 DB2 MCQs | Practice Online Quiz
1. Which of the following is NOT a type of DB2 object?
a) Tablespace
b) Index
c) Trigger
d) Procedure
Answer: d) Procedure
Explanation: The types of DB2 objects include Tables, Views, Indexes, Triggers, Sequences, Packages, and User-defined data types.
2. What is a DB2 package?
a) A collection of related tables
b) A set of stored procedures
c) A compiled set of SQL statements
d) A group of database users
Answer: c) A compiled set of SQL statements
Explanation: A DB2 package is a compiled set of SQL statements that can be executed by the database manager.
3. Which of the following is NOT a valid isolation level in DB2?
a) Cursor Stability
b) Repeatable Read
c) Serializable
d) Dirty Read
Answer: d) Dirty Read
Explanation: The valid isolation levels in DB2 are Uncommitted Read, Cursor Stability, Repeatable Read, and Serializable.
4. What is a DB2 catalog?
a) A collection of system tables
b) A list of database objects
c) A set of user-defined functions
d) A directory of database users
Answer: a) A collection of system tables
Explanation: The DB2 catalog is a set of system tables that contain metadata about the database objects and database configuration.
5. What is a DB2 trigger?
a) A type of stored procedure
b) A database event handler
c) A data validation rule
d) A database backup mechanism
Answer: b) A database event handler
Explanation: A DB2 trigger is a database event handler that is executed automatically in response to a specific database event.
6. Which of the following is NOT a type of DB2 backup?
a) Full
b) Incremental
c) Differential
d) Transactional
Answer: d) Transactional
Explanation: The types of DB2 backups include Full, Incremental, and Differential backups.
7. What is a DB2 schema?
a) A set of user-defined data types
b) A namespace for database objects
c) A group of related database tables
d) A database backup file format
Answer: b) A namespace for database objects
Explanation: A DB2 schema is a namespace for database objects, such as tables, views, and indexes.
8. What is a DB2 lock?
a) A mechanism to prevent data corruption
b) A data validation rule
c) A set of user permissions
d) A database configuration parameter
Answer: a) A mechanism to prevent data corruption
Explanation: A DB2 lock is a mechanism to prevent data corruption by controlling access to database objects.
9. Which of the following is NOT a valid DB2 data type?
a) INTEGER
b) DECIMAL
c) BOOLEAN
d) VARCHAR
Answer: c) BOOLEAN
Explanation: The valid DB2 data types include INTEGER, DECIMAL, VARCHAR, DATE, TIME, TIMESTAMP, and others.
10. What is a DB2 connection?
a) A link between a database client and a database server
b) A set of database objects
c) A type of database backup
d) A database event handler
Answer: a) A link between a database client and a database server
Explanation: A DB2 connection is a link between a database client and a database server that allows the client to access the database.
11. What is a DB2 view?
a) A type of database object
b) A compiled set of SQL statements
c) A database backup file format
d) A database event handler
Answer: a) A type of database object
Explanation: A DB2 view is a type of database object that is a virtual table based on the result set of a SELECT statement.
12. What is a DB2 index?
a) A type of database object
b) A compiled set of SQL statements
c) A data validation rule
d) A database backup file format
Answer: a) A type of database object
Explanation: A DB2 index is a type of database object that is used to speed up data retrieval by providing a quick access path to table data.
13. What is a DB2 transaction?
a) A group of SQL statements that are executed as a single unit of work
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A group of SQL statements that are executed as a single unit of work
Explanation: A DB2 transaction is a group of SQL statements that are executed as a single unit of work, either all together or not at all.
14. Which of the following is NOT a valid DB2 constraint?
a) PRIMARY KEY
b) FOREIGN KEY
c) UNIQUE
d) INDEX
Answer: d) INDEX
Explanation: An INDEX is not a constraint, but rather a type of database object used to speed up data retrieval.
15. What is a DB2 trigger action?
a) The set of SQL statements executed by a trigger
b) The event that triggers a trigger
c) A type of database backup
d) A database configuration parameter
Answer: a) The set of SQL statements executed by a trigger
Explanation: The trigger action is the set of SQL statements that are executed by a trigger in response to a database event.
16. What is a DB2 package bind?
a) The process of compiling a package
b) The process of linking a package to a plan
c) The process of executing a package
d) The process of backing up a package
Answer: b) The process of linking a package to a plan
Explanation: A package bind is the process of linking a compiled package to a plan, which is a database object that can be executed by the database manager.
17. What is a DB2 buffer pool?
a) A cache for frequently accessed database pages
b) A type of database object
c) A database backup file format
d) A database event handler
Answer: a) A cache for frequently accessed database pages
Explanation: A DB2 buffer pool is a cache for frequently accessed database pages that is used to improve database performance.
18. What is a DB2 plan?
a) A database object that can be executed by the database manager
b) A set of user-defined data types
c) A database backup file format
d) A database event handler
Answer: a) A database object that can be executed by the database manager
Explanation: A DB2 plan is a database object that can be executed by the database manager and that contains a set of executable SQL statements.
19. What is a DB2 grant?
a) A command used to give users permission to access database objects
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A command used to give users permission to access database objects
Explanation: A DB2 grant is a command used to give users permission to access database objects, such as tables, views, and indexes.
20. Which of the following is NOT a valid DB2 join type?
a) INNER JOIN
b) OUTER JOIN
c) CROSS JOIN
d) DIAGONAL JOIN
Answer: d) DIAGONAL JOIN
Explanation: DIAGONAL JOIN is not a valid DB2 join type, but rather a made-up term.
21. What is a DB2 materialized query table (MQT)?
a) A type of database backup
b) A database event handler
c) A virtual table that is based on the result set of a query
d) A type of database object used for data validation
Answer: c) A virtual table that is based on the result set of a query
Explanation: A DB2 materialized query table (MQT) is a virtual table that is based on the result set of a query, and that can be used to improve query performance.
22. What is a DB2 savepoint?
a) A point in a transaction to which the transaction can be rolled back
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A point in a transaction to which the transaction can be rolled back
Explanation: A DB2 savepoint is a point in a transaction to which the transaction can be rolled back in case of an error or other issue.
23. What is a DB2 view?
a) A type of database object that is a virtual table based on the result set of a SELECT statement
b) A compiled set of SQL statements
c) A data validation rule
d) A database backup file format
Answer: a) A type of database object that is a virtual table based on the result set of a SELECT statement
Explanation: A DB2 view is a type of database object that is a virtual table based on the result set of a SELECT statement.
24. What is a DB2 stored procedure?
a) A compiled set of SQL statements that can be executed as a single unit of work
b) A type of database backup
c) A database event handler
d) A type of database object that can be used to encapsulate complex logic
Answer: d) A type of database object that can be used to encapsulate complex logic
Explanation: A DB2 stored procedure is a type of database object that can be used to encapsulate complex logic, and that can be executed using a single SQL statement.
25. What is a DB2 catalog?
a) A set of system tables that contain metadata about database objects
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A set of system tables that contain metadata about database objects
Explanation: A DB2 catalog is a set of system tables that contain metadata about database objects, such as tables, views, indexes, and users.
26. What is a DB2 nickname?
a) A database object that provides access to data in a remote data source
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A database object that provides access to data in a remote data source
Explanation: A DB2 nickname is a database object that provides access to data in a remote data source, such as another DB2 database or a non-DB2 data source.
27. What is a DB2 table space?
a) A logical grouping of database objects that share the same physical storage characteristics
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A logical grouping of database objects that share the same physical storage characteristics
Explanation: A DB2 table space is a logical grouping of database objects that share the same physical storage characteristics, such as disk space and buffer pool settings.
28. What is a DB2 database partitioning feature?
a) A feature that allows a single database to be split across multiple physical servers
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A feature that allows a single database to be split across multiple physical servers
Explanation: A DB2 database partitioning feature is a feature that allows a single database to be split across multiple physical servers, improving scalability and availability.
29. What is a DB2 federated database?
a) A database that provides a unified view of data from multiple data sources
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A database that provides a unified view of data from multiple data sources
Explanation: A DB2 federated database is a database that provides a unified view of data from multiple data sources, such as DB2 databases, non-DB2 databases, and file systems.
30. What is a DB2 autonomous transaction?
a) A transaction that can commit or roll back independently of the main transaction
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A transaction that can commit or roll back independently of the main transaction
Explanation: A DB2 autonomous transaction is a transaction that can commit or roll back independently of the main transaction, allowing for greater transactional control and flexibility.
31. What is a DB2 trigger?
a) A database object that automatically executes a set of SQL statements in response to a specified database event
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A database object that automatically executes a set of SQL statements in response to a specified database event
Explanation: A DB2 trigger is a database object that automatically executes a set of SQL statements in response to a specified database event, such as an insert, update, or delete operation on a table.
32. What is a DB2 SQL PL?
a) A procedural programming language used for writing DB2 stored procedures and triggers
b) A type of database backup
c) A database event handler
d) A database configuration parameter
Answer: a) A procedural programming language used for writing DB2 stored procedures and triggers
Explanation: A DB2 SQL PL is a procedural programming language used for writing DB2 stored procedures and triggers, and for encapsulating complex logic within the database.
33. What is a DB2 database manager configuration?
a) A set of parameters that control the behavior of the DB2 database manager
b) A type of database backup
c) A database event handler
d) A database object used for data validation
Answer: a) A set of parameters that control the behavior of the DB2 database manager
Explanation: A DB2 database manager configuration is a set of parameters that control the behavior of the DB2 database manager, such as memory allocation, communication settings, and security settings.
34. Which of the following is NOT a valid DB2 isolation level?
a) CS
b) UR
c) NC
d) RS
Answer: c) NC
Explanation: DB2 supports four isolation levels: CS (Cursor Stability), RR (Repeatable Read), RS (Read Stability), and UR (Uncommitted Read). NC is not a valid isolation level in DB2.
35. What is the purpose of the LOCKSIZE parameter in a DB2 table creation statement?
a) To specify the maximum number of locks that can be held on a table at any given time.
b) To specify the type of locks that can be used on a table.
c) To specify the size of the table’s lock file.
d) To specify the number of pages to be locked at a time.
Answer: b) To specify the type of locks that can be used on a table.
Explanation: The LOCKSIZE parameter in a DB2 table creation statement is used to specify the type of locks that can be used on a table. It can be set to either ROW or PAGE, depending on the desired locking granularity.
36. Which of the following is true about DB2 triggers?
a) They are executed automatically in response to certain database events.
b) They are executed manually by the database administrator.
c) They can only be defined on tables, not views.
d) They can only be defined using SQL PL.
Answer: a) They are executed automatically in response to certain database events.
Explanation: DB2 triggers are automatically executed in response to certain database events, such as the insertion, update, or deletion of a row in a table. They are defined using SQL statements and can be used to enforce business rules, perform data validation, or initiate other database operations.
37. What is a DB2 package?
a) A collection of related tables in a database.
b) A set of SQL statements that have been compiled and optimized for execution.
c) A unit of work that is executed atomically.
d) A group of stored procedures that perform a specific task.
Answer: b) A set of SQL statements that have been compiled and optimized for execution.
Explanation: In DB2, a package is a set of SQL statements that have been compiled and optimized for execution. Packages are used to improve the performance of SQL queries by reducing the amount of processing required at runtime.
38. What is a DB2 cursor?
a) A database object that stores the result of a query for later retrieval.
b) A pointer to a row in a table.
c) A data structure used to store temporary data in memory.
d) A mechanism used to handle database connections.
Answer: a) A database object that stores the result of a query for later retrieval.
Explanation: In DB2, a cursor is a database object that stores the result of a query for later retrieval. Cursors are used to handle result sets that are too large to be processed in memory, and allow applications to fetch and process rows one at a time.
39. What is the purpose of the EXPLAIN statement in DB2?
a) To execute a query and retrieve the results.
b) To analyze the access path for a query.
c) To create a new table based on the results of a query.
d) To delete rows from a table.
Answer: b) To analyze the access path for a query.
Explanation: The purpose of the EXPLAIN statement in DB2 is to analyze the access path for a query. When you submit an SQL statement to DB2, the database manager must determine how to execute the statement. This involves selecting the most efficient access path to retrieve the required data. The access path can be affected by various factors, including the presence of indexes, the size of the tables involved, and the complexity of the query.
40. Which of the following is NOT a valid data type in DB2?
a) CHAR
b) VARCHAR
c) BINARY
d) INT64
Answer: d) INT64
Explanation: INT64 is not a valid data type in DB2. The correct data types are CHAR, VARCHAR, and BINARY.
41. What is the maximum length of a VARCHAR column in DB2?
a) 255 bytes
b) 32767 bytes
c) 65535 bytes
d) 2GB
Answer: b) 32767 bytes
Explanation: The maximum length of a VARCHAR column in DB2 is 32767 bytes.
42. What is the purpose of a primary key in a DB2 table?
a) It uniquely identifies each row in the table.
b) It provides a way to sort the table.
c)It allows for faster querying of the table.
d) It is not necessary in a DB2 table.
Answer: a) It uniquely identifies each row in the table.
Explanation: A primary key is used to uniquely identify each row in a DB2 table.
43. Which SQL statement is used to add a new column to an existing DB2 table?
a) ALTER TABLE
b) ADD COLUMN
c) MODIFY COLUMN
d) UPDATE TABLE
Answer: b) ADD COLUMN
Explanation: The ADD COLUMN statement is used to add a new column to an existing DB2 table.
44. What is the maximum number of columns that can be included in a DB2 table?
a) 1024
b) 4096
c) 65535
d) Unlimited
Answer: d
Explanation: There is no maximum limit to the number of columns that can be included in a DB2 table.
45. Which of the following is NOT a valid constraint in DB2?
a) PRIMARY KEY
b) UNIQUE
c) NOT NULL
d) INDEX
Answer: d) INDEX
Explanation: INDEX is not a valid constraint in DB2. The correct constraints are PRIMARY KEY, UNIQUE, and NOT NULL.
45. What is the purpose of an index in a DB2 table?
a) It provides a way to sort the table.
b) It allows for faster querying of the table.
c) It provides a backup of the table data.
d) It is not necessary in a DB2 table.
Answer: b) It allows for faster querying of the table.
Explanation: An index is used to improve the performance of queries on a DB2 table by allowing for faster searching and sorting.
46. Which of the following is NOT a valid join type in DB2?
a) INNER JOIN
b) LEFT OUTER JOIN
c) RIGHT OUTER JOIN
d) FULL OUTER JOIN
Answer: d) FULL OUTER JOIN
Explanation: FULL OUTER JOIN is not a valid join type in DB2. The correct join types are INNER JOIN, LEFT OUTER JOIN, and RIGHT OUTER JOIN.
47. Which SQL statement is used to delete a table from a DB2 database?
a) DROP TABLE
b) DELETE TABLE
c) REMOVE TABLE
d) ERASE TABLE
Answer: a) DROP TABLE
Explanation: The DROP TABLE statement is used to delete a table from a DB2 database.
48. What is the purpose of a transaction in DB2?
a) It provides a way to group a series of SQL statements into a single logical unit of work.
b) It allows for faster querying of the database.
c) It provides a backup of the database data.
d) It is not necessary in a DB2 database.
Answer: a) It provides a way to group a series of SQL statements into a single logical unit of work.
Explanation: A transaction is used to group a series of SQL statements into a single logical unit of work in a DB2 database. This allows for consistent and reliable updates to the database.
49. What is the default isolation level used by DB2?
a) READ COMMITTED
b) READ UNCOMMITTED
c) REPEATABLE READ
d) SERIALIZABLE
Answer: a) READ COMMITTED
Explanation: The default isolation level used by DB2 is READ COMMITTED.
50. Which of the following is NOT a valid type of backup in DB2?
a) Full
b) Differential
c) Incremental
d) Complete
Answer: d) Complete
Explanation: Complete is not a valid type of backup in DB2. The correct types of backups are Full, Differential, and Incremental.
These DB2 MCQ Questions And Answers will provide a valuable overview of key concepts related to DB2. By exploring various aspects of this robust database management system, including data types, constraints, transactions, backups, and security, these questions offer a solid foundation for anyone seeking to enhance their knowledge of DB2. Whether you are looking to improve your skills as a DB2 developer, administrator, or user, this DB2 Multi Choice Quiz can help you better understand the essential features and capabilities of this technology, enabling you to work more effectively and efficiently with your data. Follow our Freshersnow website in your free time to get more updates on this.