How to Configure MySQL Read/Write Splitting in Magento 2 for Better Scalability

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Magento 2 stores under heavy traffic often face database bottlenecks caused by read and write queries competing for connections on a single server. The solution is MySQL read/write replication splitting, which routes SELECT queries to replica databases while keeping writes on the primary server. Magento 2 has native support for this via a 'default_read' connection entry in the app/etc/env.php configuration file. Once configured, read replicas can be scaled horizontally as traffic grows, reducing load on the primary database. Proper setup also requires configuring MySQL replication itself and monitoring for replication lag in production environments.

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