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Managing primary and replica database architectures traditionally required third-party wrapper packages or heavy middleware layers. PDO v20 embeds read/write splitting directly into the core connection management. Defining Connection Pools in the DSN pdo v20 extended features
For handling massive datasets, the PDO::FETCH_STREAM mode allows developers to process rows one by one without loading the entire result set into memory, preventing common memory exhaustion errors. I can provide target benchmarks and optimized drivers