title	summary
Performance Schema	了解 TiDB `performance_schema` 系统数据库。

Performance Schema

TiDB 实现了兼容 MySQL 的 performance schema 表。

与 MySQL 兼容的表

表名	描述
`events_stages_current`
`events_stages_history`
`events_stages_history_long`
`events_statements_current`
`events_statements_history`
`events_statements_history_long`
`events_statements_summary_by_digest`
`events_transactions_current`
`events_transactions_history`
`events_transactions_history_long`
`global_status`
`prepared_statements_instances`
`session_connect_attrs`	为会话提供连接属性。
`session_status`
`session_variables`
`setup_actors`
`setup_consumers`
`setup_instruments`
`setup_objects`