Performance Schema Quick Start The Performance Schema is implemented as a storage engine, so you can see it listed in the output from the  INFORMATION_SCHEMA.ENGINES  table or the  SHOW ENGINES  statement: The  PERFORMANCE_SCHEMA  storage engine operates on tables in the  performance_schema  database. You can make  performance_schema  the default database so that references to its tables need not be qualified with the database name: Performance Schema tables are stored in the  performance_schema  database. Information about the structure of this database and its tables can be obtained, as for any other database, by selecting from the  INFORMATION_SCHEMA  database or by using  SHOW  statements. For example, use either of these statements to see what Performance Schema tables exist: mysql>  SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = ’performance_schema’; +------------------------------------------------------+ | TABLE_NAME | +------------------------------------------------------+ | accounts | | cond_instances | ... | events_stages_current | | events_stages_history | | events_stages_history_long | | events_stages_summary_by_account_by_event_name | | events_stages_summary_by_host_by_event_name | | events_stages_summary_by_thread_by_event_name | | events_stages_summary_by_user_by_event_name | | events_stages_summary_global_by_event_name | | events_statements_current | | events_statements_history | | events_statements_history_long | ... | file_instances | | file_summary_by_event_name | | file_summary_by_instance | | host_cache | | hosts | | memory_summary_by_account_by_event_name | | memory_summary_by_host_by_event_name | | memory_summary_by_thread_by_event_name | | memory_summary_by_user_by_event_name | | memory_summary_global_by_event_name | | metadata_locks | | mutex_instances | 4896 mysql>  SELECT * FROM INFORMATION_SCHEMA.ENGINES WHERE ENGINE=’PERFORMANCE_SCHEMA’\G *************************** 1. row *************************** ENGINE: PERFORMANCE_SCHEMA SUPPORT: YES COMMENT: Performance Schema TRANSACTIONS: NO XA: NO SAVEPOINTS: NO mysql>  SHOW ENGINES\G ... Engine: PERFORMANCE_SCHEMA Support: YES Comment: Performance Schema Transactions: NO XA: NO Savepoints: NO ... mysql>  USE performance_schema;