Databricks Certified Data Engineer - Associate

Explanation

In Databricks, when you create a database using the CREATE DATABASE command without specifying a custom location, the database is created in the default Hive warehouse directory. The default location for Hive databases in Databricks is:

dbfs:/user/hive/warehouse/

When you create a database without specifying a location, Databricks creates a subdirectory with the database name inside this warehouse directory. So for the customer360 database, the actual directory would be:

dbfs:/user/hive/warehouse/customer360.db

However, among the given options, option B (dbfs:/user/hive/warehouse) is the correct answer because it represents the default warehouse location where databases are stored.

Key Points:

1. Default Location: The default Hive warehouse directory is dbfs:/user/hive/warehouse/
2. Database Directory: Each database gets its own subdirectory with .db extension
3. Custom Location: If you want a different location, you need to specify it explicitly:

   CREATE DATABASE customer360 LOCATION 'dbfs:/mnt/data/customer360';
   

   CREATE DATABASE customer360 LOCATION 'dbfs:/mnt/data/customer360';
   
4. Option Analysis:
   • A: Incorrect - This path pattern doesn't exist in Databricks
   • B: Correct - This is the default warehouse location
   • C: Incorrect - Databases aren't created directly under /user/hive/
   • D: Incorrect - The default location is known and doesn't require additional information
   • E: Incorrect - This path doesn't exist as a default location

This understanding is important for Databricks data engineers to know where their data is stored and how to manage database locations effectively.