Answer: Enable storage autoscaling in RDS

## Explanation **Correct Answer: A - Enable storage autoscaling in RDS** Amazon RDS Storage Autoscaling automatically scales storage capacity when needed, without requiring downtime. Here's why this is the best solution: ### Key Benefits: 1. **No Downtime**: Storage autoscaling works seamlessly without interrupting database operations 2. **Least Effort**: Simply enable the feature - no manual intervention required 3. **Automatic**: Monitors storage usage and scales automatically when needed 4. **Cost-Effective**: Only pays for additional storage when actually used ### Why Other Options Are Not Optimal: **B. Increase the RDS database instance size** - This changes the instance class (CPU/RAM), not just storage - May cause downtime during instance modification - More complex than just increasing storage **C. Change the RDS database instance storage type to Provisioned IOPS** - This changes storage performance characteristics, not capacity - Doesn't solve the low disk space issue - May require downtime depending on the change **D. Back up the RDS database, increase the storage capacity, restore the database, and stop the previous instance** - This involves significant manual effort - Requires downtime during backup/restore operations - Most complex and time-consuming approach ### How RDS Storage Autoscaling Works: 1. You set a maximum storage threshold 2. RDS monitors storage usage 3. When storage consumption reaches the autoscaling threshold, RDS automatically increases storage 4. The process is transparent to applications ### Best Practices: - Enable storage autoscaling proactively for production databases - Set appropriate maximum storage limits to control costs - Monitor storage growth patterns to understand usage trends This solution perfectly meets the requirements of increasing disk space without downtime with the least amount of effort.

Author: LeetQuiz Editorial Team