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| Section | Weight | Objectives |
|---|---|---|
| Prepare and process data | 30–35% | - Optimize and manage data storage
|
| Secure and govern Unity Catalog objects | 15–20% | - Manage data sharing and permissions
|
| Deploy and maintain data pipelines and workloads | 30–35% | - Build and orchestrate pipelines
|
| Set up and configure an Azure Databricks environment | 15–20% | - Select and configure compute resources
|
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NEW QUESTION # 30
You need to ingest real-time IoT data into Delta Lake with exactly-once guarantees. Which approach should you use?
Answer: A
Explanation:
Structured Streaming with checkpointing ensures fault tolerance and exactly-once processing semantics in Databricks. It tracks processed offsets and recovers from failures automatically.
Batch ingestion cannot guarantee real-time processing. Copy activity is not designed for streaming workloads and manual ingestion is not scalable or reliable.
NEW QUESTION # 31
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.
Answer:
Explanation:
Explanation:
Two actions are needed to reclaim storage while keeping tables queryable:
Set delta.deletedFileRetentionDuration and delta.logRetentionDuration to 90 days on each table. These properties define the retention floor - VACUUM will not touch anything newer than this threshold, so no data needed for time travel within 90 days can be accidentally removed.
Run VACUUM on each table. VACUUM is the Delta Lake command that physically removes data files and transaction log entries older than the retention duration. Importantly, VACUUM runs as a background operation - it uses Delta Lake's MVCC (multi-version concurrency control) to ensure that concurrent reads against the table continue uninterrupted while cleanup happens. Tables are fully available throughout.
OPTIMIZE compacts small files for query performance but doesn't delete anything. Manually deleting files outside the Delta protocol would corrupt the table.
Reference: https://learn.microsoft.com/en-us/azure/databricks/sql/language-manual/delta-vacuum
NEW QUESTION # 32
Hotspot Question
You have an Azure Databricks workspace that is enabled for Unity Catalog and contains a catalog named Catalog1. Catalog1 contains a schema named Schema1 and a table named Table1.
You need to ensure that access to the data in Table1 is controlled by using attribute-based access control (ABAC).
What should you apply to Table1, and how should you control access for users? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
NEW QUESTION # 33
What does the VACUUM command do in Delta Lake?
Answer: D
Explanation:
VACUUM removes old, unreferenced files that are no longer needed after updates or deletes. It helps manage storage but does not improve query performance directly. OPTIMIZE handles performance improvements. Schema changes are unrelated.
NEW QUESTION # 34
Hotspot Question
You have an Azure Databricks workspace that is enabled for Unity Catalog and contains a managed Delta table named Table1.
Table1 is written by batch jobs every hour and is queried frequently by filtering two columns named Customerid and EventDate.
You expect Table1 to grow significantly over time.
The rows in Table1 are frequently updated and deleted to support compliance requests.
You need to keep query performance consistent as Table1 grows. The solution must minimize update and deletion effort.
What should you include in the solution? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
Answer:
Explanation:
NEW QUESTION # 35
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