Question 754 of 760
DP-203 Develop data processing Practice Question
You are designing a data processing solution using Azure Databricks. The data is stored in Delta Lake format. You need to ensure that when you read the latest version of the table, you only see committed data and not uncommitted transactions. Which isolation level should you use?
⚠ Common exam trap
Test-takers frequently confuse write isolation levels (like WriteSerializable) with read isolation levels, or assume that Serializable is always the safest choice for consistency, when in fact Snapshot isolation is the specific Delta Lake mechanism for reading only committed data without blocking.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SnapshotIsolation
Snapshot isolation is the correct choice because it provides a consistent view of the table by reading only the latest committed data, ignoring any uncommitted transactions. In Delta Lake, snapshot isolation ensures that readers see a snapshot of the table at a specific version, which includes only committed changes, making it ideal for read consistency without blocking concurrent writes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
WriteSerializable
Why it's wrong here
WriteSerializable is for write conflicts, not read isolation.
- ✗
Serializable
Why it's wrong here
Serializable is an isolation level but not specifically the one that reads only committed data; Snapshot is the default for reads.
- ✗
ReadUncommitted
Why it's wrong here
ReadUncommitted allows reading uncommitted data.
- ✓
SnapshotIsolation
Why this is correct
Delta Lake uses Snapshot isolation to read the latest committed version.
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Last reviewed: Jun 24, 2026
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