What are the different isolation levels in databases?

What are the different isolation levels in databases?

There are four main isolation levels: Read Uncommitted, Read Committed, Repeatable Read, and Serializable. Each level balances consistency and performance differently.

Can you explain Read Committed with an example?

Sure! In Read Committed, a transaction can only read data that has been committed. For example, if Transaction A is updating a record, Transaction B cannot read that record until Transaction A is complete.

What about Serializable? How does it work?

Serializable is the strictest isolation level. It ensures that transactions are completely isolated from one another, as if they were executed one after the other. This prevents phenomena like dirty reads and non-repeatable reads.

Which isolation level is the most commonly used?

Read Committed is the most commonly used isolation level in many applications because it provides a good balance between performance and data integrity.