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 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).
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