Amazon RDS now supports ENA Express for Multi-AZ replication
Amazon Web Services has enabled ENA Express for Amazon RDS Multi-AZ deployments, introducing significant performance improvements for database replication traffic between Availability Zones. The enhancement leverages AWS's Scalable Reliable Datagram (SRD) protocol to deliver up to 25 Gbps single-flow bandwidth for cross-AZ replication, utilizing advanced congestion control and multi-pathing capabilities to reduce latency variability in Multi-AZ configurations. The SRD protocol dynamically distributes replication traffic across multiple network paths while adapting to network congestion in real time, resulting in increased write throughput and lower write latencies for write-intensive database workloads. ENA Express is now available at no additional charge across RDS engines including MariaDB, MySQL, PostgreSQL, Db2, and Oracle, spanning multiple AWS regions including Asia Pacific, Europe, North America, and AWS GovCloud. Organizations with existing RDS instances can enable the feature by performing a start-stop or compute scaling action, with specific instance type requirements detailed in AWS documentation.
Why It Matters
This infrastructure enhancement addresses a critical performance bottleneck in enterprise database deployments by optimizing the network layer for Multi-AZ replication. For organizations running write-intensive applications on RDS, the improved throughput and reduced latency can translate to better application responsiveness and higher transaction volumes without additional costs, making AWS RDS more competitive against other managed database offerings.
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