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What is the main purpose of setting replicas in an Elasticsearch index?

easy🧠 Conceptual Q11 of Q15
Elasticsearch - Performance and Scaling

What is the main purpose of setting replicas in an Elasticsearch index?

ATo encrypt data for security
BTo delete old data automatically
CTo compress data for storage savings
DTo create copies of data for faster search and fault tolerance
Step-by-Step Solution
Solution:

  1. Step 1: Understand replica role

    Replicas are copies of the original data that help improve search speed and provide backup in case of failure.

  2. Step 2: Compare options

    Only To create copies of data for faster search and fault tolerance correctly describes replicas as copies for speed and safety; others describe unrelated features.

  3. Final Answer:

    To create copies of data for faster search and fault tolerance -> Option D

  4. Quick Check:

    Replicas = copies for speed and safety [OK]
Quick Trick: Replicas are copies that speed up search and protect data [OK]
Common Mistakes:
MISTAKES
  • Confusing replicas with data deletion
  • Thinking replicas compress data
  • Assuming replicas encrypt data

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