Google PCA Practice Question: Analysing and Optimising Technical and Business Processes
A team wants to define an SLO for a service that requires 99.9% availability over a 30-day window. They need to measure the ratio of successful requests to total requests. Which SLI should they use?
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
✓
Request success rate
An SLI is a measure of service performance. For availability, the standard SLI is the proportion of successful requests (e.g., HTTP 2xx) to total requests. Latency SLI measures response times. Error budget is derived from SLO. SRE is the practice.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Request success rate
Why this is correct
The proportion of successful requests is the standard SLI for availability.
- ✗
SRE
Why it's wrong here
SRE is a discipline, not an SLI.
- ✗
Request latency
Why it's wrong here
Latency measures speed, not availability.
- ✗
Error budget
Why it's wrong here
Error budget is the amount of allowed failure (1 - SLO), not a measure of whether requests are successful.
Go deeper
Related to this question
Learn chapter
IAM Policies, Service Accounts, and Auditing
Key term
SLI
An SLI (Service Level Indicator) is a carefully chosen metric that measures one specific aspect of a service's performance, such as request latency or error rate, to help determine whether the service is meeting its reliability goals.
Key term
SLO
A Service Level Objective is a measurable target for a specific aspect of a service's performance or reliability that a team commits to meeting over a defined period.
About these practice questions
This PCA question is part of Courseiva's 955-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 by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCA practice question is part of Courseiva's free Google Cloud 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.