mysql> select * from performance_schema.metadata_locks;
+-------------+--------------------+----------------+-------------+-----------------------+---------------------+---------------+-------------+-------------------+-----------------+----------------+
| OBJECT_TYPE | OBJECT_SCHEMA      | OBJECT_NAME    | COLUMN_NAME | OBJECT_INSTANCE_BEGIN | LOCK_TYPE           | LOCK_DURATION | LOCK_STATUS | SOURCE            | OWNER_THREAD_ID | OWNER_EVENT_ID |
+-------------+--------------------+----------------+-------------+-----------------------+---------------------+---------------+-------------+-------------------+-----------------+----------------+
| TABLE       | performance_schema | metadata_locks | NULL        |       140446424792192 | SHARED_READ         | TRANSACTION   | GRANTED     | sql_parse.cc:6084 |         2170254 |             10 |
| BACKUP LOCK | NULL               | NULL           | NULL        |       140458717974272 | INTENTION_EXCLUSIVE | EXPLICIT      | GRANTED     | rpl_rli.cc:3334   |         2170467 |              3 |
+-------------+--------------------+----------------+-------------+-----------------------+---------------------+---------------+-------------+-------------------+-----------------+----------------+
2 rows in set (0.00 sec)