What are the different database isolation levels?

What are the different database isolation levels?

There are four main database isolation levels: Read Uncommitted, Read Committed, Repeatable Read, and Serializable. Each level defines how transaction integrity is visible to other transactions.

Can you explain Read Uncommitted?

Read Uncommitted allows transactions to read data that has been modified but not yet committed by other transactions. This can lead to dirty reads.

What about Serializable?

Serializable is the strictest isolation level. It ensures complete isolation from other transactions, meaning no other transactions can read or write data until the current transaction is complete.

Which isolation level is the best?

The best isolation level depends on your application's needs. Serializable offers the highest integrity but can reduce performance due to locking. Read Committed is often a good balance.