What are the different database isolation levels?

What are the different database isolation levels?

Database isolation levels define how transaction integrity is visible to other transactions. The main levels are: 1. Read Uncommitted 2. Read Committed 3. Repeatable Read 4. Serializable.

Can you explain each isolation level in detail?

Sure! 1. Read Uncommitted: Allows dirty reads, meaning transactions can see uncommitted changes. 2. Read Committed: Prevents dirty reads; transactions only see committed changes. 3. Repeatable Read: Ensures that if a transaction reads a row, it will see the same data if it reads it again. 4. Serializable: The strictest level, it ensures complete isolation from other transactions.

What are the trade-offs of using higher isolation levels?

Higher isolation levels provide more consistency but can lead to increased locking and reduced concurrency, which may impact performance.

Which isolation level is best for high-performance applications?

For high-performance applications, Read Committed is often recommended as it balances consistency and concurrency.