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An index has number_of_shards set to 3 and number_of_replicas set to 2. How many shard copies exist in total?

medium📝 query result Q5 of 15
Elasticsearch - Index Management
An index has number_of_shards set to 3 and number_of_replicas set to 2. How many shard copies exist in total?
A9
B5
C6
D3
Step-by-Step Solution
Solution:
  1. Step 1: Calculate total shards including replicas

    Total shards = primary shards + replicas per primary * number of primary shards = 3 + (2 * 3) = 9.
  2. Step 2: Confirm the total count

    Each primary shard has 2 replicas, so total copies are 9.
  3. Final Answer:

    9 -> Option A
  4. Quick Check:

    Total shards = shards x (1 + replicas) [OK]
Quick Trick: Multiply shards by (1 + replicas) for total copies [OK]
Common Mistakes:
MISTAKES
  • Adding shards and replicas incorrectly
  • Counting only replicas
  • Ignoring replicas in total count

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