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In DynamoDB, what primarily determines the cost of your database usage?

easy🧠 Conceptual Q11 of 15
DynamoDB - Cost Optimization and Monitoring
In DynamoDB, what primarily determines the cost of your database usage?
AThe number of read and write operations per second
BThe number of tables you create
CThe size of your database backup files
DThe number of indexes you define
Step-by-Step Solution
Solution:

  1. Step 1: Understand DynamoDB cost factors

    DynamoDB charges mainly based on how many read and write requests you perform per second.

  2. Step 2: Identify the main cost driver

    While backups and indexes can affect cost, the primary cost is from read/write capacity usage.

  3. Final Answer:

    The number of read and write operations per second -> Option A

  4. Quick Check:

    Cost depends on read/write operations [OK]
Quick Trick: Focus on read/write operations for cost estimation [OK]
Common Mistakes:
MISTAKES
  • Thinking table count directly affects cost
  • Confusing backup size with operational cost
  • Assuming indexes alone drive cost

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