Apache Hive Interview Questions and Answers

Ques 6. What is the purpose of Hive metastore?

Hive metastore stores metadata about Hive tables, partitions, and databases.

Ques 7. How can you load data into Hive from an external table?

You can use the 'LOAD DATA INPATH' or 'INSERT OVERWRITE' command to load data into Hive from an external table.

Example:

LOAD DATA INPATH '/path/to/data' INTO TABLE table_name;

Ques 8. What is the purpose of Hive UDFs (User-Defined Functions)?

Hive UDFs allow users to define custom functions to perform operations not supported by built-in functions.

Ques 9. How can you optimize Hive queries for better performance?

Optimizations include partitioning, bucketing, using indexes, and tuning query execution parameters.

Ques 10. What is the purpose of Hive SerDe?

Hive SerDe (Serializer/Deserializer) is used to read and write data in custom formats.