MongoDB Atlas Free 512 MB free storage

Free limit: 1 Free cluster, a database execution environment, is provided per project. Documents and indexes can be stored up to a combined total of 512 MB, and up to 100 operations per second are allowed. The limits are 10 GB for incoming transfer and 10 GB for outgoing transfer over the 7 days immediately preceding each point in time. Managed backups are not provided.

Eligibility: Both new and existing projects can use it, and there is a limit on the number of clusters per project.

Card registration: Card registration is not required.

When used in Korea: The official region table confirms Free/Flex support for AWS Seoul ap-northeast-2. The sign-up process in Korea has not been tested.

When not in use: It is automatically paused after 30 days without connections. There may be restrictions when restoring very old database versions.

When the limits are exceeded: If the transfer or operation count limits are exceeded, the speed is throttled or processing is handled through a queue. Storage does not increase automatically. The exact error that occurs when storage is full needs to be confirmed.

Commercial use: The conditions that explicitly allow or prohibit commercial use of Free need to be confirmed. The fact that it is promoted for learning purposes alone does not mean that commercial use is prohibited under the contract.

Usage period: The Free cluster itself has no time limit, and the official creation guide also states that it does not expire.