Transaction Models in NewSQL

1. Introduction

NewSQL databases are designed to provide the scalability and performance of NoSQL systems while maintaining the strong consistency and usability of traditional SQL databases. This lesson will delve into the transaction models used in NewSQL databases, focusing on key principles and best practices.

2. Transaction Models

Transaction models in NewSQL databases are crucial for ensuring data integrity and consistency. The main transaction models include:

2.1 ACID Transactions

ACID stands for Atomicity, Consistency, Isolation, and Durability. NewSQL databases often implement ACID properties to ensure reliable transaction processing.

2.2 Eventual Consistency

Some NewSQL databases may adopt an eventual consistency model, allowing for temporary discrepancies in data states with a guarantee that consistency will be achieved eventually.

2.3 Multi-Version Concurrency Control (MVCC)

MVCC allows multiple transactions to access the database concurrently without conflicting. Each transaction works with a snapshot of the data.

BEGIN TRANSACTION;
SELECT * FROM users WHERE id = 1; -- Snapshot of data
-- Perform operations
COMMIT; -- Changes are applied

3. Concurrency Control

Concurrency control mechanisms are implemented to maintain data integrity in a multi-user environment. Techniques include:

4. Best Practices

To effectively implement transaction models in NewSQL databases, follow these best practices:

5. FAQ