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Microsoft Implementing Data Engineering Solutions Using Azure Databricks Sample Questions:

1. What does the VACUUM command do in Delta Lake?

A) Compresses JSON files
B) Deletes old unreferenced files
C) Optimizes query performance
D) Rewrites table schema

2. What is the best way to reduce Databricks compute cost for intermittent workloads?

A) Use single-node clusters only
B) Use all-purpose clusters
C) Increase cluster size
D) Enable autoscaling and auto-termination

3. Hotspot Question
You have an Azure Databricks workspace that is enabled for Unity Catalog.
You need to implement a data lifecycle and expiration solution that meets the following requirements:
- Transaction logs and deleted data files that are older than 90 days
must be removed from Delta tables to reclaim storage.
- All the tables must remain available for querying during the cleanup
process.
- Administrative effort must be minimized.
What should you do for each requirement? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.

4. You have an Azure Databricks workspace named Workspace1 that uses a Git repository. The repository contains a Databricks notebook named Notebook1.
From the main branch, you create a feature branch named Branch1 and commit changes to Notebook1. Another user commits changes to Notebook1 in main.
When you attempt to merge Branch1 into main, the merge fails due to conflicts.
You need to merge Branch1 into the main branch. The solution must ensure that Notebook1 includes all the changes from both the branches.
What should you do?

A) Apply the main branch changes to Branch1 and resolve the conflicts.
B) Apply the changes directly to the main branch.
C) From Workspace1, clone the main branch as a new repository.
D) From Workspace1, clone Branch1 as a new repository.

5. A Delta table receives new fields in incoming JSON data. You want to automatically adapt without breaking pipelines. What should you enable?

A) Auto Loader with schema inference and evolution
B) Disable schema enforcement
C) Use overwrite mode
D) Manually update schema each time

Solutions: