來源於：https://www.cnblogs.com/CtripDBA/p/11465315.html，侵刪，純截圖，避免吸引流量之嫌
case1，刪除大表時，因為清理自適應hash索引占用的內容導致的MySQL服務掛起
來源：https://keithlan.github.io/2018/03/27/truncate_drop/
case2，大表的隨意Drop或者truncate導致MySQL服務的掛起
按照本文中的結論就是
MySQL5.6版本以下：使用truncate table + drop table 替代 drop table
MySQL5.6版本+ ： 直接使用drop table
On a system with a large InnoDB buffer pool and innodb_adaptive_hash_index enabled,
TRUNCATE TABLE operations may cause a temporary drop
in system performance due to an LRU scan that occurs when removing an InnoDB table's adaptive hash index entries.
The problem was addressed
for DROP TABLE in MySQL 5.5.23 (Bug #13704145, Bug #64284) but remains a known issue for TRUNCATE TABLE (Bug #68184).
葉問中的解決辦法
