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You tried to apply a new option to an RDS instance by modifying its option group, but the change did not take effect. What is a likely cause?

medium📝 Debug Q6 of 15
AWS - RDS and Relational Databases
You tried to apply a new option to an RDS instance by modifying its option group, but the change did not take effect. What is a likely cause?
AThe option group was not associated with the RDS instance
BThe parameter group was not modified accordingly
CThe instance class does not support option groups
DThe subnet group is missing required subnets
Step-by-Step Solution
Solution:
  1. Step 1: Check option group association

    Option changes only apply if the option group is attached to the RDS instance.
  2. Step 2: Exclude unrelated causes

    Parameter groups do not affect option group changes; instance class supports option groups; subnet groups affect networking, not options.
  3. Final Answer:

    The option group was not associated with the RDS instance -> Option A
  4. Quick Check:

    Option changes need attached option group [OK]
Quick Trick: Attach option group to instance to apply options [OK]
Common Mistakes:
  • Modifying parameter group instead of option group
  • Assuming instance class blocks option groups
  • Confusing subnet group issues with option group

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