如何获取 MySQL 数据库的最后访问（和/或写入）时间？

SELECT update_time
FROM INFORMATioN_SCHEMA.TABLES
WHERE table_schema = 'yourDatabaseName'
AND table_name = 'yourTableName'

mysql> SELECT update_time
   -> FROM INFORMATION_SCHEMA.TABLES
   -> WHERE table_schema = 'business'
   -> AND table_name = 'twoprimarykeytabledemo';

+---------------------+
| UPDATE_TIME         |
+---------------------+
| 2018-11-21 16:51:50 |
+---------------------+
1 row in set (0.24 sec)

mysql> SELECT update_time
   -> FROM INFORMATION_SCHEMA.TABLES
   -> WHERE table_schema = 'business'
   -> AND table_name = 'currenttimezone';

+---------------------+
| UPDATE_TIME         |
+---------------------+
| 2018-10-29 17:20:18 |
+---------------------+
1 row in set (0.20 sec)

mysql> SELECT update_time
   -> FROM INFORMATION_SCHEMA.TABLES
   -> WHERE table_schema = 'business'
   -> AND table_name = 'zerofilldemo';

+-------------+
| UPDATE_TIME |
+-------------+
| NULL        |
+-------------+
1 row in set (0.09 sec)