mysqldump 备份报 Warning: A partial dump from a server that has GTIDs will by default include the..

备份mysql 报警告如下：

Warning: A partial dump from a server that has GTIDs will by default include the GTIDs of all transactions, even those that changed suppressed parts of the database. If you don't want to restore GTIDs, pass --set-gtid-purged=OFF. To make a complete dump, pass --all-databases --triggers --routines --events. 

mysqldump --version
mysqldump  Ver 10.13 Distrib 5.6.34, for Linux (x86_64)
关于GTID是5.6以后，加入了全局事务 ID (GTID) 来强化数据库的主备一致性，故障恢复，以及容错能力。
官方给的：A global transaction identifier (GTID) is a unique identifier created and associated with each transaction committed on the server of origin (master).
所以可能是因为在一个数据库里面唯一，但是当导入其他的库就有可能重复。所有会有一个提醒。

可以通过添加--set-gtid-purged=off 或者–gtid-mode=OFF这两个参数设置。
个人认为是在导入库中重新生产GTID，而不用原来的。

mysqldump -uUsername -h xx.xx.xx.xx -P3306 DBname t_name --set-gtid-purged=off -p >t_name.sql(表名)