PERFORMANCESCHEMA
Performance Schema, often referred to by its abbreviation PERFORMANCE_SCHEMA, is a built-in instrumentation framework in MySQL and certain forks designed to provide detailed, low-overhead visibility into server performance. It collects data on wait events, statement execution, stages, memory usage, I/O, and locking, exposing these metrics through a dedicated set of read-only tables inside the performance_schema database. The goal is to aid database administrators and developers in diagnosing bottlenecks, understanding workload characteristics, and tuning configurations.
The data model of Performance Schema centers on instrument points and consumers. Administrators enable or disable
Usage and impact: Performance Schema is widely used for diagnosing slow queries, long-running transactions, and contention
Limitations and scope: While powerful, the schema’s data interpretation requires familiarity with the server’s internals, and