问题
In our production servers, whenever we have production peak times, we often encounter following command stuck.
461720 c6b2c772b91fd3d8 wra01.ntex.com:33664 c6b2c772b91fd3d8 Query 24 Opening tables DESC `tabSMS Alert` 0.000
Is DESC a locking command which has to wait for something?
来源：https://stackoverflow.com/questions/59005376/why-does-mariadb-gets-stuck-at-opening-tables-when-desc-command-is-used-when-u