show global variables like 'innodb_cleanout_safe_mode';
Variable_name	Value
innodb_cleanout_safe_mode	ON
show global status like 'lizard_txn_undo_log_hash%';
Variable_name	Value
Lizard_txn_undo_log_hash_element	#
Lizard_txn_undo_log_hash_hit	#
Lizard_txn_undo_log_hash_miss	#