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What is Filesort / External merge sort?
General
MySQL
When performing sorting operations for ORDER BY, GROUP BY and there is no sufficient memory to sort all data at once, database will partition the data, sort them batch by batch and write the intermediate sorting results to disk. Since it involves heavy I/O operations, it will drastically impact query performance.
Safer and faster database change and version control for DBAs and Developers
Bytebase is an open source, web-based database schema change and version control tool for teams. It offers a web-based collaboration workspace to help DBAs and Developers manage the lifecycle of application database schemas.
