Database Transactions -Isolation Levels

??Hello LinkedIn Community!

Today, let's talk about the often overlooked but critical aspect of Database transactions - Isolation Levels.??

In a perfect world, two transactions wouldn't touch each other's data. But in reality, we have to deal with webhooks, websockets and user inputs which require database storage and can lead to race conditions.??

Isolation levels help determine how much your transaction is affected by concurrent transactions. The higher the isolation level, the less your transaction will be impacted by others.??? There are four main types:

1?? Read Uncommitted: Allows a transaction to read uncommitted (aka "dirty") data from another transaction.

2?? Read Committed: Only allows reading of committed data at the start of a transaction. It is the default isolation level in PostgreSQL.

3?? Repeatable Read: A transaction cannot see uncommitted data; running multiple select queries will always return the same result.

4?? Serializable: This strict level emulates transactions as if they were run sequentially, ensuring no uncommitted data issues arise but potentially impacting performance.

Understanding these levels can help optimize our databases for better performance and reliability! ??

I'd love to hear your thoughts on these isolation levels. Have you encountered any particular challenges or successes? Let's open up this discussion! ??

#Database #IsolationLevels #PerformanceOptimization