Apache Hive Interview Questions and Answers

Ques 21. How does Hive handle schema evolution?

Hive supports schema evolution, allowing the addition of new columns to existing tables without affecting the older data.

Ques 22. What is Hive's ACID support, and when is it used?

Hive ACID (Atomicity, Consistency, Isolation, Durability) support is used for managing transactions in Hive tables.

Ques 23. How can you enable Hive vectorization?

You can enable Hive vectorization by setting the 'hive.vectorized.execution.enabled' configuration property to true.

Ques 24. What is Hive's role in the Hadoop ecosystem?

Hive provides a high-level SQL-like interface for querying and analyzing data stored in Hadoop Distributed File System (HDFS).

Ques 25. How can you perform data sampling in Hive?

You can use the 'TABLESAMPLE' clause in the 'SELECT' statement to perform data sampling in Hive.

Example:

SELECT * FROM table_name TABLESAMPLE(BUCKET x OUT OF total);