MySQL to PostgreSQL Database Migration: A Practical Case Study

Migrating a database from MySQL to PostgreSQL is a multifaceted endeavor that encompasses schema conversion, data transfer, query optimization, and performance refinement. This article presents a real-life scenario involving the migration of an e-commerce platform’s database from MySQL 8.0 to PostgreSQL 15, highlighting the nuances and outcomes of this transition.

Project Overview

– Industry: E-commerce

– Database Size: Approximately 120 GB

– Number of Tables: 200+

– Queries per Second (QPS): Around 350

– Replication Setup: Transitioned from MySQL Master-Slave to PostgreSQL Streaming Replication

– Primary Use Case: Online Transaction Processing (OLTP)

– Goal: Enhance read-heavy performance, optimize complex query execution, and streamline JSON processing

Pre-Migration Performance Benchmarks

To establish a baseline for comparison, we meticulously gathered essential performance data from MySQL 8.0 using tools like `sysbench` and `EXPLAIN ANALYZE`. This initial assessment laid the groundwork for evaluating the impact of the migration on system efficiency and query execution.