What Should I Do If an RDS DB Instance Is Abnormal Due to Full Storage Space?

You can scale up storage space if it is no longer sufficient for your requirements. If the DB instance status is Storage full and no more data can be written to the database, the DB instance will be abnormal.

Solution

As your application data grows, the original storage space may be insufficient. You are advised to scale up storage space by referring to Scaling Up Storage Space.
You can view the memory usage of your instance using DBA Assistant. For details, see Viewing Storage Usage.

If the storage capacity has reached the upper limit of your DB instance class, change the instance class first.

For details, see Changing a DB Instance Class.
Delete expired data files in a timely manner.
View performance metrics of your DB instance on the console, such as CPU, memory, storage, and connections. You can also set alarm rules for metric thresholds to identify risks in advance.
For details, see Viewing the Overall Status of a DB Instance.