MESSAGE: Native table 'performance_schema'.'session_variables' has the wrong structure

--从mysql5.7.6开始information_schema.global_status已经开始被舍弃，为了兼容性，此时需要打开 show_compatibility_56 2）character_set_database ， collation_database  Value改为utf8，修改my.conf [client] default-character-set=utf8  [mys

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