title: Quiz 3
description: This quiz is to test your understanding of TiDB's resilience and high availability.
allow_repeat_submission: true
evaluate_immediately: true
show_correct_answer: true

questions:
  - type: SingleChoice
    question: When a TiDB cluster is properly deployed across three data centers or Availability Zones (AZs), will your data be lost if one entire data center or AZ goes down?
    options:
      - id: 1
        text: "True"
      - id: 2
        text: "False"
        correct: true
    explanation: Properly deployed, TiDB uses data replication across multiple AZs. If one AZ goes down, data remains safe and available in the other AZs due to redundancy and high availability mechanisms.

  - type: SingleChoice
    question: When a TiDB cluster is properly deployed across three data centers or Availability Zones (AZs), will you need to perform specific manual failover efforts to bring your application back online if one AZ goes down?
    options:
      - id: 1
        text: Yes, manual intervention is required to restore service.
      - id: 2
        text: No, TiDB's high availability mechanisms will automatically handle failover.
        correct: true
    explanation: When deployed across three AZs with the help of TiDB experts or using TiDB Cloud, it is designed to automatically fail over if one AZ goes down. No specific manual intervention is required—applications can continue operating as TiDB transparently handles the failover using raft consensus and replica quorum.