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  1. MySQL users and least privilegeMySQL users and least privilegeCreate one MySQL user per app, grant rights only on that schema, and avoid FILE, GRANT OPTION, and host wildcards unless you truly need remote access.Updated Aug 29, 2026
  2. Indexes that actually helpIndexes that actually helpA MySQL index is a sorted copy of a column that makes lookups cheap. Run EXPLAIN on the slow query, add the index it needs, and skip the…Updated Aug 29, 2026