What is the difference between transaction isolation and concurrency?

What is the difference between transaction isolation and concurrency?

Transaction isolation refers to the degree to which the operations in one transaction are isolated from those in other transactions. Concurrency, on the other hand, is about how multiple transactions can be executed simultaneously without interfering with each other.

Can you explain the different levels of transaction isolation?

Sure! The main levels of transaction isolation are Read Uncommitted, Read Committed, Repeatable Read, and Serializable. Each level provides a different balance between performance and data integrity.

What are some common issues that arise with low isolation levels?

Common issues include dirty reads, non-repeatable reads, and phantom reads. These can lead to inconsistent data being read by transactions.

How does concurrency control work in databases?

Concurrency control manages the execution of transactions to ensure data integrity. Techniques include locking, timestamp ordering, and optimistic concurrency control.