Aikesheng Open Source Community
Apr 17, 2019 · Databases
SQL Refactoring Guide Based on Distributed Middleware
This article explains how distributed middleware processes simple SQL, ER‑based joins, and cross‑database joins, analyzes their performance impacts, and provides practical recommendations for optimizing SQL statements by using shard conditions, limiting clauses, low‑cardinality columns, and table ordering.
Cross-DB JoinDistributed MiddlewareER Join
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