What are the four types of consistency?

The Four Types of Consistency

There are four primary types of consistency:

1. Strong Consistency: This guarantees that any read operation will always return the most recent write for a given piece of data.
2. Eventual Consistency: This ensures that, given enough time, all updates will propagate through the system, and all copies of data will converge to the same value.
3. Weak Consistency: This allows for reads that may return stale data since the system does not guarantee that every read will reflect the most recent write.
4. Session Consistency: This type ensures that within a user session, reads yield the most recent writes, maintaining a consistent view for the user.