Database Engine Expertise Questions

Deep practical knowledge of specific database engines, including engine internals, storage engines, concurrency and locking models, replication and failover mechanisms, backup and restore approaches, configuration defaults and version upgrade practices. Candidates should demonstrate familiarity with engine specific performance tuning patterns, tooling and extensions, common failure modes and diagnostics, and migration and compatibility considerations when moving between engines or versions. Examples include understanding PostgreSQL internals and extensions, MySQL storage engines and configuration, and how engine design affects operational choices.