什么是freeingitems

什么是freeingitems，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

show processlist 查看到大量的 freeing items状态会话

查看官方文档，官方文档在8.14.2 General Thread States章节给出了线程状态的解释

说明命令已经在执行正在进行清理 更新日志索引等

mysql> SELECT @@profiling;+-------------+| @@profiling |+-------------+|           0 |+-------------+1 row in set (0.00 sec)mysql> SET profiling = 1;Query OK, 0 rows affected (0.00 sec)mysql> DROP TABLE IF EXISTS t1;Query OK, 0 rows affected, 1 warning (0.00 sec)mysql> CREATE TABLE T1 (id INT);Query OK, 0 rows affected (0.01 sec)mysql> SHOW PROFILES;+----------+----------+--------------------------+| Query_ID | Duration | Query |+----------+----------+--------------------------+|        0 | 0.000088 | SET PROFILING = 1 ||        1 | 0.000136 | DROP TABLE IF EXISTS t1 ||        2 | 0.011947 | CREATE TABLE t1 (id INT) |+----------+----------+--------------------------+3 rows in set (0.00 sec)mysql> SHOW PROFILE;+----------------------+----------+| Status           |      Duration |+----------------------+----------+| checking permissions | 0.000040 || creating table | 0.000056 || After create | 0.011363 || query end | 0.000375 || freeing items | 0.000089 || logging slow query | 0.000019 || cleaning up | 0.000005 |+----------------------+----------+7 rows in set (0.00 sec)mysql> SHOW PROFILE FOR QUERY 1;+--------------------+----------+| Status | Duration |+--------------------+----------+| query end | 0.000107 || freeing items | 0.000008 || logging slow query | 0.000015 || cleaning up | 0.000006 |+--------------------+----------+4 rows in set (0.00 sec)mysql> SHOW PROFILE CPU FOR QUERY 2;+----------------------+----------+----------+------------+| Status             | Duration | CPU_user | CPU_system |+----------------------+----------+----------+------------+| checking permissions | 0.000040 | 0.000038 | 0.000002 || creating table | 0.000056 | 0.000028 | 0.000028 || After create | 0.011363 | 0.000217 | 0.001571 || query end | 0.000375 | 0.000013 | 0.000028 || freeing items | 0.000089 | 0.000010 | 0.000014 || logging slow query | 0.000019 | 0.000009 | 0.000010 || cleaning up     | 0.000005 | 0.000003 | 0.000002 |2662SHOW Statements+----------------------+----------+----------+------------+7 rows in set (0.00 sec)

最后看宿主机的监控状态，load达到了 50多

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