성능 스키마를 사용하여 AWS RDS MySQL 5.7+에서 장기 실행 ALTERS를 모니터링하는 방법

-- Enable events_stages_current to monitor threads
UPDATE performance_schema.setup_consumers 
SET ENABLED = 'YES' 
WHERE NAME = 'events_stages_current';

-- Check results of below to see that ENABLED 
-- and EnabledWithHierarchy are both "YES"
SELECT 
    NAME, 
    ENABLED, 
    sys.ps_is_consumer_enabled(NAME) AS EnabledWithHierarchy 
FROM performance_schema.setup_consumers 
WHERE NAME = 'events_stages_current';

SELECT 
    stmt.THREAD_ID, 
    stmt.SQL_TEXT, 
    stage.EVENT_NAME AS State,
        stage.WORK_COMPLETED, 
    stage.WORK_ESTIMATED,
  ROUND(100*stage.WORK_COMPLETED/stage.WORK_ESTIMATED, 2) AS CompletedPct
FROM performance_schema.events_statements_current stmt
INNER JOIN performance_schema.events_stages_current stage
ON stage.THREAD_ID = stmt.THREAD_ID
AND stage.NESTING_EVENT_ID = stmt.EVENT_ID

-- ALTERNATIVELY
----------------
-- SELECT 
--  thd_id, 
--     conn_id, 
--     db, 
--     command, 
--     state, 
--     current_statement,
--     statement_latency, 
--     progress, 
--     current_memory, 
--     program_name
-- FROM sys.session
-- WHERE progress IS NOT NULL;