4.3 Design cost-optimized database solutions.
Objective 4.3 sits in Design Cost-Optimized Architectures, which carries 20% of the Solutions Architect Associate exam. The questions below are original, written from the official objective title above, and each explanation cites the Amazon Web Services (AWS) page it rests on.
Objective title verbatim from the official objectives. Amazon Web Services (AWS) exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
A DynamoDB table's traffic has been flat for two years and the team can forecast next quarter's request rate closely. Which capacity choice costs least here?
Correct.
Concept
Paying per request removes the risk of guessing wrong, and that insurance is priced into the unit rate. Where demand is genuinely predictable there is no risk left to insure, so committing to a rate is the cheaper trade.
Why B
Provisioned mode bills for the hourly capacity you declare rather than what you consume, which AWS recommends for steady workloads with predictable growth that can be forecast reliably. That description matches this table exactly.
Source
Now you: objective 4.3 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
A table holds years of order history queried a few times a month, and storage is far and away the largest line on its bill. What do you change?
Sample question 2 of 3
A team stops a development RDS instance each Friday and starts it again on Monday, then finds the saving smaller than expected. What are they still paying for?
Sample question 3 of 3
A team holds a reserved db.r5.large for RDS for PostgreSQL and scales the running instance up to db.r5.xlarge. What happens to that reservation?
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Read the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.