The document discusses scaling a PHP application using database sharding and Amazon Web Services. It describes using MySQL databases sharded across multiple database servers to improve scalability. Key points include using an application driver to determine which shard to write to, caching static files and data, and leveraging various Amazon services like S3, EC2, CloudWatch, and Route 53. Benefits of this approach include smaller, faster databases that are easier to manage and scale out writes by adding additional database shards.
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