Apache Hive Interview Questions and Answers

Ques 26. What is the purpose of Hive skew join optimization?

Hive skew join optimization is used to handle skewed data distribution during join operations, improving performance.

Ques 27. Explain the use of Hive's EXPLAIN statement.

The 'EXPLAIN' statement in Hive provides the execution plan of a query, helping in query optimization and troubleshooting.

Example:

EXPLAIN SELECT * FROM table_name;

Ques 28. What are the types of Hive tables?

Hive supports managed tables (internal) and external tables. Managed tables store data in a Hive-controlled location, while external tables reference data stored outside Hive.

Ques 29. How can you limit the number of rows returned in a Hive query?

You can use the 'LIMIT' clause to restrict the number of rows returned in a Hive query.

Example:

SELECT * FROM table_name LIMIT 10;

Ques 30. What is the purpose of Hive's distributed cache?

Hive's distributed cache is used to distribute small read-only files, such as lookup tables, to all the nodes in a Hadoop cluster for improved performance.