DS0-001 Database Structures And SQL Practice Question
A database administrator is investigating performance degradation during heavy concurrent write operations. Which isolation level provides the highest level of data consistency but the lowest concurrency?
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
✓
Serializable
Serializable isolation ensures that concurrent transactions result in a state that could have been achieved if transactions were executed serially, preventing all phenomena but reducing concurrency.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Read Committed
Why it's wrong here
Read Committed provides a balance between performance and consistency.
- ✗
Repeatable Read
Why it's wrong here
Repeatable Read prevents non-repeatable reads but not phantom reads.
- ✓
Serializable
Why this is correct
Serializable provides the highest consistency by preventing all concurrency-related anomalies.
- ✗
Read Uncommitted
Why it's wrong here
Read Uncommitted offers the highest concurrency but lowest consistency.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CompTIA exam blueprint
This DS0-001 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DS0-001 exam.