DP-203 Design and implement data storage Practice Question
You are designing a delta lake architecture in Azure Synapse Analytics. Which TWO practices should you follow to ensure ACID transactions and data consistency?
⚠ Common exam trap
Many exam-takers confuse performance optimization (OPTIMIZE) or file format choice (CSV) with ACID transaction guarantees, but the exam specifically tests the understanding that the transaction log is the fundamental enabler of atomicity, consistency, isolation, and durability in Delta Lake.
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
✓
Use the Delta Lake transaction log for all write operations
The Delta Lake transaction log is the core mechanism that enables ACID transactions. Every write operation (insert, update, delete, merge) is recorded as an atomic commit in the transaction log, ensuring that concurrent readers see a consistent snapshot and that partial writes are never visible. Without this log, Delta Lake cannot guarantee atomicity or isolation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable schema evolution to prevent accidental schema changes
Why it's wrong here
Schema evolution is a feature, not a requirement for ACID; disabling it is not a best practice.
- ✗
Run OPTIMIZE commands frequently to compact small files
Why it's wrong here
OPTIMIZE improves performance, not ACID compliance.
- ✓
Use the Delta Lake transaction log for all write operations
Why this is correct
The transaction log ensures ACID compliance by recording all operations.
- ✗
Store data in CSV format to simplify schema enforcement
Why it's wrong here
CSV does not support ACID; Delta Lake uses Parquet.
- ✓
Enable write-ahead logging to support concurrent reads and writes
Why this is correct
Write-ahead logging ensures data consistency during concurrent operations.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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