Amazon Aurora with MySQL compatibility has now added support for Hash Join to accelerate the speed of equijoin queries. Aurora’s cost-based optimizer can now decide when to utilize Hash joins automatically and the user can also force their utilization in a query plan. Hash Joins enhances the latency of queries for internal testing in a decision to support the benchmark when utilizing a cold buffer pool by up to 8.2x on an R3.8x large instance. Batched Scans accelerates speed in-memory queries by a factor up to 1.8x. The features are available in the lab mode on Amazon Aurora MySQL version 1.16.
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