Aikesheng Open Source Community

Apr 21, 2022 · Databases

Investigation of MySQL 5.7 Opening‑Table State Caused by Federated Engine Queries

The article analyzes why a MySQL 5.7.32 instance’s monitoring thread remains in the Opening table state when querying information_schema.tables, discovers the involvement of the Federated storage engine, reproduces the issue with a non‑existent remote server, and confirms the root cause through controlled experiments.