What are transaction isolation levels?

Can you explain what transaction isolation levels are?

Transaction isolation levels define how transaction integrity is visible to other transactions. They control the visibility of changes made by one transaction to others.

What are the different types of isolation levels?

There are four main isolation levels: Read Uncommitted, Read Committed, Repeatable Read, and Serializable. Each level offers a different balance between performance and data integrity.

What happens at the Read Uncommitted level?

At the Read Uncommitted level, transactions can read changes made by other transactions even if they are not yet committed, which can lead to dirty reads.

Which isolation level is the safest?

The Serializable isolation level is the safest as it ensures complete isolation from other transactions, preventing phenomena like dirty reads, non-repeatable reads, and phantom reads.