Q93 — AWS SOA-C02 Ch.1

Question 93 of 100 | ← Chapter 1

A SysOps administrator needs to ensure that an Amazon RDS for PostgreSQL DB instance has available backups. The DB instance has automated backups turned on with a backup retention period of 7 days. However, no automated backups for the DB instance have been created in the past month. What could be the cause of the lack of automated backups?

• A. The Amazon S3 bucket that stores the backups is full.
• B. The DB instance is in the STORAGE_FULL state. ✓
• C. The DB instance is not Configured for Multi-AZ.
• D. The backup retention period must be 30 days.

Correct Answer: B. The DB instance is in the STORAGE_FULL state.

Explanation

Amazon RDS的自动备份功能依赖实例的可用存储空间。当实例处于STORAGE_FULL状态时，所有写入操作（包括备份所需的日志记录和快照）会被阻止。AWS文档明确指出，存储空间不足会导致自动备份失败。选项B正确，因为实例存储已满直接影响备份能力；选项A错误，RDS备份存储由AWS管理，用户不可见S3桶；选项C错误，Multi-AZ不影响备份生成；选项D错误，保留期7天在允许范围内（0-35天）。