You tried launching an RDS instance but got an error: "InvalidParameterCombination: Storage size must be at least 20 GB for db.t3.micro". Your command was:

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AWS - RDS and Relational Databases

aws rds create-db-instance --db-instance-identifier testdb --db-instance-class db.t3.micro --engine postgres --master-username admin --master-user-password Pass1234 --allocated-storage 10

What is the cause of the error?

AAllocated storage size is below the minimum for the instance class

BMaster username is invalid

CEngine type postgres is not supported

DDB instance identifier is missing

Step-by-Step Solution

Solution:

Step 1: Analyze error message details
The error says storage must be at least 20 GB for db.t3.micro, but 10 GB was given.
Step 2: Check command parameters
The command uses --allocated-storage 10, which is too small for this instance class.
Final Answer:
Allocated storage size is below the minimum for the instance class -> Option A
Quick Check:
Storage size too small causes error [OK]

Quick Trick: Check minimum storage size for instance class [OK]

Common Mistakes:

MISTAKES

Ignoring minimum storage requirements
Blaming username or engine type incorrectly
Missing required parameters in command

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You tried launching an RDS instance but got an error: "InvalidParameterCombination: Storage size must be at least 20 GB for db.t3.micro". Your command was:

Step 1: Analyze error message details

Step 2: Check command parameters

Final Answer:

Quick Check:

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