top -p $(pidof mysqld) -n 1

cat /proc/$(pidof mysqld)/status

SHOW GLOBAL VARIABLES LIKE '%buffer%szie%';

SELECT * FROM sys.memory_global_total;

SELECT
  EVENT_NAME,
  CURRENT_NUMBER_OF_BYTES_USED AS memory_bytes,
  CURRENT_NUMBER_OF_BYTES_USED / 1024 / 1024 AS memory_mb
FROM
  performance_schema.memory_summary_global_by_event_name
WHERE
  CURRENT_NUMBER_OF_BYTES_USED > 0
ORDER BY
  CURRENT_NUMBER_OF_BYTES_USED DESC
LIMIT 10;

SELECT
  EVENT_NAME,
  SUM(SUM_NUMBER_OF_BYTES_ALLOC) / 1024 / 1024 AS total_memory_mb
FROM
  performance_schema.memory_summary_global_by_event_name
GROUP BY
  EVENT_NAME
ORDER BY
  SUM_NUMBER_OF_BYTES_ALLOC DESC
LIMIT 10;

SELECT
  m.EVENT_NAME,
  m.COUNT_ALLOC,
  m.CURRENT_NUMBER_OF_BYTES_USED AS mem_sum,
  (m.CURRENT_NUMBER_OF_BYTES_USED / 1024 / 1024.0) AS mem_sum_mb,
  t.NAME,
  t.TYPE,
  t.PROCESSLIST_ID,
  LEFT(t.PROCESSLIST_INFO, 10)
FROM
  performance_schema.memory_summary_by_thread_by_event_name m
  JOIN performance_schema.threads t
 USING (THREAD_ID)
WHERE   
 t.PROCESSLIST_ID != CONNECTION_ID()
ORDER BY
  m.CURRENT_NUMBER_OF_BYTES_USED desc
LIMIT 10;

SELECT * FROM sys.memory_by_thread_by_current_bytes LIMIT 10;

SELECT * FROM sys.memory_global_by_current_bytes order by current_alloc desc LIMIT 10;

SELECT * FROM sys.memory_by_user_by_current_bytes;