What does the snapshot isolation level allow in a database?

The snapshot isolation level in a database allows readers to access their own, consistent version of the data as it was at the time the transaction started, without being blocked by other transactions. This means that when a transaction is reading data, it does so from a point-in-time snapshot, rather than receiving data that may be in the process of being updated or modified by other transactions.

This approach enables better concurrency because multiple transactions can proceed without impacting one another, allowing readers to see a stable view of the database. It significantly reduces the chances of encountering locking issues that can arise in more traditional isolation levels, where writes can block reads and vice versa.

In contrast, the other options describe behaviors that are not characteristic of snapshot isolation. Readers accessing uncommitted data or their own uncommitted transactions pertains to different isolation levels, while socio-economic data protection is unrelated to the principles of database isolation levels.