MySQL transaction isolation levels explained in this handy guide by our experts.

At Bobcares, we offer solutions for every query, big and small, as a part of our MySQL Support Service.

Let’s take a look at how our Support Team is ready to help customers understand the different MySQL transaction isolation levels.

MySQL transaction isolation levels explained & more

MySQL transaction isolation defines how the MySQL server separates the transactions from other concurrently running transactions in the server. Furthermore, it ensures that transaction processing takes place without any interruption.

Additionally, when transactions are not isolated, it can result in data modification by one of the other transactions leading to data inconsistency. The isolation levels ascertain the isolation of the different transactions.

MySQL supports the following isolation levels:

• READ UNCOMMITTED
• READ COMMITTED
• REPEATABLE READ
• SERIALIZABLE

Moreover, these isolation levels can be either globally or session based on our requirements. Let’s take a look at the different Isolation levels and the anomalies as well:

READ UNCOMMITTED

This isolation level does not offer much isolation between transactions at all. In other words, there are no locks. Furthermore, this isolation level permits Dirty Read, where one transaction gets to see uncommitted changes made by other transactions.

READ COMMITTED

While the dirty read anomaly does not occur in the READ COMMITTED isolation level, it still offers a Non-repeatable read. The non-repeatable read results in different outputs because the data is modified by another transaction committed at the same time.

REPEATABLE READ

The REPEATABLE READ isolation level avoids the Non-repeatable read anomaly. However, this level permits Phantom read. It involves a user repeating the read operation on the same set of records but also has new records in the results.

SERIALIZABLE

This is the strongest isolation level available. It isolates the effect of one transaction completely from the other transactions.

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Conclusion

To sum up, our skilled Support Engineers at Bobcares took us though the different MySQL transaction isolation levels.