set global server_id=1;
reset master;
drop table if exists t1,t2,t3;
create table t1 (a int);
select @@server_id;
@@server_id
1
show binlog events  from <binlog_start>;
Log_name	Pos	Event_type	Server_id	End_log_pos	Info
master-bin.000001	#	Gtid_list	1	#	[]
master-bin.000001	#	Binlog_checkpoint	1	#	master-bin.000001
master-bin.000001	#	Gtid	1	#	GTID #-#-#
master-bin.000001	#	Query	1	#	use `test`; DROP TABLE IF EXISTS `t1`,`t2`,`t3` /* generated by server */
master-bin.000001	#	Gtid	1	#	GTID #-#-#
master-bin.000001	#	Query	1	#	use `test`; create table t1 (a int)
set global server_id=2;
create table t2 (b int);
select @@server_id;
@@server_id
2
show binlog events  from <binlog_start>;
Log_name	Pos	Event_type	Server_id	End_log_pos	Info
master-bin.000001	#	Gtid_list	1	#	[]
master-bin.000001	#	Binlog_checkpoint	1	#	master-bin.000001
master-bin.000001	#	Gtid	1	#	GTID #-#-#
master-bin.000001	#	Query	1	#	use `test`; DROP TABLE IF EXISTS `t1`,`t2`,`t3` /* generated by server */
master-bin.000001	#	Gtid	1	#	GTID #-#-#
master-bin.000001	#	Query	1	#	use `test`; create table t1 (a int)
master-bin.000001	#	Gtid	2	#	GTID #-#-#
master-bin.000001	#	Query	2	#	use `test`; create table t2 (b int)
set global server_id=3;
create table t3 (c int);
select @@server_id;
@@server_id
3
show binlog events  from <binlog_start>;
Log_name	Pos	Event_type	Server_id	End_log_pos	Info
master-bin.000001	#	Gtid_list	1	#	[]
master-bin.000001	#	Binlog_checkpoint	1	#	master-bin.000001
master-bin.000001	#	Gtid	1	#	GTID #-#-#
master-bin.000001	#	Query	1	#	use `test`; DROP TABLE IF EXISTS `t1`,`t2`,`t3` /* generated by server */
master-bin.000001	#	Gtid	1	#	GTID #-#-#
master-bin.000001	#	Query	1	#	use `test`; create table t1 (a int)
master-bin.000001	#	Gtid	2	#	GTID #-#-#
master-bin.000001	#	Query	2	#	use `test`; create table t2 (b int)
master-bin.000001	#	Gtid	3	#	GTID #-#-#
master-bin.000001	#	Query	3	#	use `test`; create table t3 (c int)
set global server_id=1;
drop table t1,t2,t3;