PCA Observability Concepts Practice Question
Which THREE are true regarding the Prometheus TSDB?
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
✓
It uses an inverted index for fast searching.
It uses blocks, WAL, and index files, and it is optimized for time-series data.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It uses an inverted index for fast searching.
Why this is correct
Crucial for label filtering.
- ✓
It stores data in blocks of time.
Why this is correct
Blocks are the storage unit.
- ✗
It uses a B-tree for all queries.
Why it's wrong here
It uses inverted indexes.
- ✗
It is a relational database.
Why it's wrong here
It is time-series specific.
- ✓
It maintains a Write Ahead Log (WAL).
Why this is correct
Ensures data integrity.
About these practice questions
This PCA question is part of Courseiva's 304-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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 CNCF / Linux Foundation exam blueprint
This PCA practice question is part of Courseiva's free CNCF / Linux Foundation 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 PCA exam.