How to confirm the usage of change buffer (체인지 버퍼 사용량 확인방법)

SELECT (SELECT COUNT(*) FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE WHERE PAGE_TYPE LIKE 'IBUF%') AS change_buffer_pages,
(SELECT COUNT(*) FROM INFORMATION_SCHEMA.INNODB_BUFFER_PAGE) AS total_pages, 
(SELECT ((change_buffer_pages/total_pages)*100)) AS change_buffer_page_percentage;

+---------------------+-------------+-------------------------------+
| change_buffer_pages | total_pages | change_buffer_page_percentage |
+---------------------+-------------+-------------------------------+
|                   3 |        8192 |                        0.0366 |
+---------------------+-------------+-------------------------------+
1 row in set (0.06 sec)

mysql>​