Final answer:
The Hive Metastore is used in Big SQL for managing table definitions, locations, and storage formats of input files, serving as a central metadata repository.
Step-by-step explanation:
In Big SQL, the Hive Metastore is used for table definitions, locations, and storage format of input files. The Hive Metastore is a critical component in a Hadoop ecosystem, and it stores metadata for Hive tables (like structure and location) as well as partitions. It allows users and applications to interact with the metadata of the tables to perform various data operations in Hadoop. When working with Big SQL, understanding the role of the Hive Metastore is essential for accessing and managing table metadata effectively.