stop slave;drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;reset master;reset slave;drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;start slave;reset master;create table t1(n int);insert into t1 values (@a), (@b);select * from t1;nNULLNULLselect * from t1;n12set global init_connect="set @c=1";show variables like 'init_connect';Variable_name Valueinit_connect set @c=1drop table t1;stop slave;