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Home / Interview Subjects / IBM DB2
WithoutBook LIVE Mock Interviews IBM DB2 Related interview subjects: 24

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Know the top IBM DB2 interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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The Best LIVE Mock Interview - You should go through before interview

Know the top IBM DB2 interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

Explain the difference between DB2 and other relational databases.

DB2 is known for its advanced features like pureXML, Time Travel Query, and deep compression, setting it apart from other relational databases.
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Ques 3

What is the difference between a primary key and a unique key in DB2?

Both primary and unique keys enforce the uniqueness of values, but a table can have only one primary key, while it can have multiple unique keys.
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Ques 5

Explain the purpose of the RUNSTATS command in DB2.

The RUNSTATS command is used to collect statistics about the data in tables and indexes, helping the query optimizer to generate efficient query plans.
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Ques 8

What is the purpose of the LOAD utility in DB2?

The LOAD utility is used to efficiently load large amounts of data into DB2 tables. It is faster than using SQL INSERT statements for bulk data loading.
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Ques 9

Explain the difference between a view and a materialized query table (MQT) in DB2.

A view is a virtual table based on the result of a SELECT query, while an MQT is a physical table that stores the result of a query, and its data is updated periodically.
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Ques 12

What is the purpose of the RUNTIMESTATS option in DB2?

The RUNTIMESTATS option is used to collect runtime statistics for SQL statements, providing information about resource usage during query execution.
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Ques 15

Explain the purpose of the EXPORT and IMPORT utilities in DB2.

The EXPORT utility is used to export data from DB2 tables, while the IMPORT utility is used to import data into DB2 tables. They are often used for data migration and backups.
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Ques 16

What is a package bind in DB2?

A package bind is the process of associating a package, which contains the compiled form of SQL statements, with a database. It is a crucial step in executing SQL statements.
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Ques 17

Explain the purpose of the LOAD RESUME option in the LOAD utility.

The LOAD RESUME option allows the loading of data to resume from the point of failure in case of a previous load failure, reducing the need to reload all data.
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Ques 18

What is the purpose of the db2move command in DB2?

The db2move command is used for copying or moving data between databases. It is particularly useful for exporting and importing data in a structured manner.
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Ques 19

Explain the concept of table space in DB2.

A table space is a container for database objects such as tables, indexes, and long field columns. It provides a logical grouping of related objects for storage management.
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Ques 20

What is a correlated scalar subquery in DB2?

A correlated scalar subquery is a subquery that returns a single value and is evaluated once for each row processed by the outer query, using values from that row.
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Ques 22

Explain the purpose of the REBIND command in DB2.

The REBIND command is used to rebind packages in DB2, refreshing the access plan and optimizing the SQL statements after changes to the database or its statistics.
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Ques 23

What is the purpose of the db2exfmt command in DB2?

The db2exfmt command is used to format the output of the EXPLAIN statement, providing a more readable and understandable representation of the access plan.
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Ques 24

Explain the purpose of the db2look command in DB2.

The db2look command is used to generate SQL statements that can recreate the structure and data of a database, including tables, indexes, and constraints.
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