今天用户报出来一个问题：
show full processlist;时出现下面的情况：
|
| 46977247 | common | % | common | Connect |391 | updating|
| 46977311 | common | % | common | Connect |331 | updating|
| 46977312 | common | % | common | Connect |330 | updating|
| 46977406 | common | % | common | Connect |237 | updating|
| 46977413 | common | % | common | Connect |231 | updating|
| 46977446 | common | % | common | Connect |201 | updating|
| 46977459 | common | % | common | Connect |189 | updating|
| 46977462 | common | % | common | Connect |186 | updating|
| 46977477 | common | % | common | Connect |171 | updating|
| 46977489 | common | % | common | Connect |159 | updating|
| 46977490 | common | % | common | Connect |158 | updating|
| 46977493 | common | % | common | Connect |155 | updating|
| 46977496 | common | % | common | Connect |152 | updating|
| 46977511 | common | % | common | Connect |137 | updating|
| 46977519 | common | % | common | Connect |129 | updating|
| 46977523 | common | % | common | Connect |125 | updating|
| 46977526 | common | % | common | Connect |123 | updating|
| 46977530 | common | % | common | Connect |119 | updating|
| 46977532 | common | % | common | Connect |117 | updating|
| 46977533 | common | % | common | Connect |116 | updating|
| 46977537 | common | % | common | Connect |113 | updating
host那一列显示的只是一个 %号，没有显示ip地址。


这看起来有点不应该。 想了一下原因：没有想到，网上也不没有找到答案。


灵感出现在一瞬间：




使用下面的方式模拟：


delimiter ;;


CREATE DEFINER=`root`@`%` PROCEDURE `insert_pro`()
begin
DECLARE counter INT DEFAULT 0;
insert_loop: loop
set counter=counter+1;
insert into test values (counter,counter,counter);
if counter=10000 then
leave insert_loop;
end if;
end loop insert_loop;
end
;;

CREATE EVENT IF NOT EXISTS e_test
ON SCHEDULE EVERY 10 SECOND
ON COMPLETION PRESERVE
DO CALL test.insert_pro();


然后去show full processlist;


mysql> show full processlist;
+----+-----------------+-----------------+------+---------+------+-----------------------------+----------------------------------------------------+
| Id | User| Host| db| Command | Time | State| Info|
+----+-----------------+-----------------+------+---------+------+-----------------------------+----------------------------------------------------+
| 1 | event_scheduler | localhost| NULL | Daemon |2 | Waiting for next activation | NULL|
| 64 | root| localhost:34176 | test | Sleep|52 | | NULL|
| 65 | root| localhost:34177 | NULL | Query|0 | System lock | show full processlist |
| 74 | root| %| test | Connect |0 | query end| insert into test values (counter,counter,counter) |
| 75 | root| %| test | Connect |0 | query end| insert into test values (counter,counter,counter) |
+----+-----------------+-----------------+------+---------+------+-----------------------------+----------------------------------------------------+
5 rows in set (0.00 sec)


可以模拟出这种情况。


其实就是event调用的结果。




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