# 连接\&会话\&资源清理
[CLEAN CONNECTION](https://support.huaweicloud.com/sqlreference-dws/dws_06_0151.html)
:
[ALTER SYSTEM KILL SESSION](https://support.huaweicloud.com/sqlreference-dws/dws_06_0141.html)
:
[ALTER SESSION](https://support.huaweicloud.com/sqlreference-dws/dws_06_0139.html)
:
[DISCARD](https://support.huaweicloud.com/sqlreference-dws/dws_06_0283.html)
:
[TRUNCATE](https://support.huaweicloud.com/sqlreference-dws/dws_06_0225.html)
:
[VACUUM](https://support.huaweicloud.com/sqlreference-dws/dws_06_0226.html)
: