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SELECT lock_mode, lock_duration, lock_type, table_schema, table_name FROM information_schema.metadata_lock_info;
lock_mode lock_duration lock_type table_schema table_name
FLUSH TABLES WITH READ LOCK;
SELECT lock_mode, lock_duration, lock_type, table_schema, table_name FROM information_schema.metadata_lock_info;
lock_mode lock_duration lock_type table_schema table_name
MDL_SHARED NULL Commit lock
MDL_SHARED NULL Global read lock
UNLOCK TABLES;
SELECT lock_mode, lock_duration, lock_type, table_schema, table_name FROM information_schema.metadata_lock_info;
lock_mode lock_duration lock_type table_schema table_name
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