change master 'abc' to relay_log_file=''; ERROR HY000: Failed initializing relay log position: Could not find target log during relay log initialization change master 'abc2' to master_host=''; ERROR HY000: Incorrect arguments to MASTER_HOST change master 'master1' to master_port=MYPORT_1, master_host='127.0.0.1', master_user='root'; start slave 'master1'; set default_master_connection = 'master1'; include/wait_for_slave_to_start.inc show slave 'master1' status; Slave_IO_State Master_Host Master_User Master_Port Connect_Retry Master_Log_File Read_Master_Log_Pos Relay_Log_File Relay_Log_Pos Relay_Master_Log_File Slave_IO_Running Slave_SQL_Running Replicate_Do_DB Replicate_Ignore_DB Replicate_Do_Table Replicate_Ignore_Table Replicate_Wild_Do_Table Replicate_Wild_Ignore_Table Last_Errno Last_Error Skip_Counter Exec_Master_Log_Pos Relay_Log_Space Until_Condition Until_Log_File Until_Log_Pos Master_SSL_Allowed Master_SSL_CA_File Master_SSL_CA_Path Master_SSL_Cert Master_SSL_Cipher Master_SSL_Key Seconds_Behind_Master Master_SSL_Verify_Server_Cert Last_IO_Errno Last_IO_Error Last_SQL_Errno Last_SQL_Error Replicate_Ignore_Server_Ids Master_Server_Id Master_SSL_Crl Master_SSL_Crlpath Using_Gtid Gtid_IO_Pos Replicate_Do_Domain_Ids Replicate_Ignore_Domain_Ids Waiting for master to send event 127.0.0.1 root MYPORT_1 60 master-bin.000001 313 mysqld-relay-bin-master1.000002 601 master-bin.000001 Yes Yes 0 0 313 907 None 0 No 0 No 0 0 1 No show slave status; Slave_IO_State Master_Host Master_User Master_Port Connect_Retry Master_Log_File Read_Master_Log_Pos Relay_Log_File Relay_Log_Pos Relay_Master_Log_File Slave_IO_Running Slave_SQL_Running Replicate_Do_DB Replicate_Ignore_DB Replicate_Do_Table Replicate_Ignore_Table Replicate_Wild_Do_Table Replicate_Wild_Ignore_Table Last_Errno Last_Error Skip_Counter Exec_Master_Log_Pos Relay_Log_Space Until_Condition Until_Log_File Until_Log_Pos Master_SSL_Allowed Master_SSL_CA_File Master_SSL_CA_Path Master_SSL_Cert Master_SSL_Cipher Master_SSL_Key Seconds_Behind_Master Master_SSL_Verify_Server_Cert Last_IO_Errno Last_IO_Error Last_SQL_Errno Last_SQL_Error Replicate_Ignore_Server_Ids Master_Server_Id Master_SSL_Crl Master_SSL_Crlpath Using_Gtid Gtid_IO_Pos Replicate_Do_Domain_Ids Replicate_Ignore_Domain_Ids Waiting for master to send event 127.0.0.1 root MYPORT_1 60 master-bin.000001 313 mysqld-relay-bin-master1.000002 601 master-bin.000001 Yes Yes 0 0 313 907 None 0 No 0 No 0 0 1 No show all slaves status; Connection_name Slave_SQL_State Slave_IO_State Master_Host Master_User Master_Port Connect_Retry Master_Log_File Read_Master_Log_Pos Relay_Log_File Relay_Log_Pos Relay_Master_Log_File Slave_IO_Running Slave_SQL_Running Replicate_Do_DB Replicate_Ignore_DB Replicate_Do_Table Replicate_Ignore_Table Replicate_Wild_Do_Table Replicate_Wild_Ignore_Table Last_Errno Last_Error Skip_Counter Exec_Master_Log_Pos Relay_Log_Space Until_Condition Until_Log_File Until_Log_Pos Master_SSL_Allowed Master_SSL_CA_File Master_SSL_CA_Path Master_SSL_Cert Master_SSL_Cipher Master_SSL_Key Seconds_Behind_Master Master_SSL_Verify_Server_Cert Last_IO_Errno Last_IO_Error Last_SQL_Errno Last_SQL_Error Replicate_Ignore_Server_Ids Master_Server_Id Master_SSL_Crl Master_SSL_Crlpath Using_Gtid Gtid_IO_Pos Replicate_Do_Domain_Ids Replicate_Ignore_Domain_Ids Retried_transactions Max_relay_log_size Executed_log_entries Slave_received_heartbeats Slave_heartbeat_period Gtid_Slave_Pos master1 Slave has read all relay log; waiting for the slave I/O thread to update it Waiting for master to send event 127.0.0.1 root MYPORT_1 60 master-bin.000001 313 mysqld-relay-bin-master1.000002 601 master-bin.000001 Yes Yes 0 0 313 907 None 0 No 0 No 0 0 1 No 0 1073741824 7 0 60.000 drop database if exists db1; create database db1; use db1; create table t1 (i int auto_increment, f1 varchar(16), primary key pk (i,f1)) engine=MyISAM; insert into t1 (f1) values ('one'),('two'); select * from db1.t1; i f1 1 one 2 two # List of relay log files in the datadir mysqld-relay-bin-master1.000001 mysqld-relay-bin-master1.000002 mysqld-relay-bin-master1.index show relaylog events; Log_name Pos Event_type Server_id End_log_pos Info mysqld-relay-bin-master1.000001 4 Format_desc 3 248 Server version mysqld-relay-bin-master1.000001 248 Rotate 3 306 mysqld-relay-bin-master1.000002;pos=4 show relaylog events in 'mysqld-relay-bin-master1.000002'; Log_name Pos Event_type Server_id End_log_pos Info mysqld-relay-bin-master1.000002 4 Format_desc 3 248 Server version mysqld-relay-bin-master1.000002 248 Rotate 1 0 master-bin.000001;pos=4 mysqld-relay-bin-master1.000002 292 Format_desc 1 248 Server version mysqld-relay-bin-master1.000002 536 Gtid_list 1 273 [] mysqld-relay-bin-master1.000002 561 Binlog_checkpoint 1 313 master-bin.000001 mysqld-relay-bin-master1.000002 601 Gtid 1 351 GTID 0-1-1 mysqld-relay-bin-master1.000002 639 Query 1 440 drop database if exists db1 mysqld-relay-bin-master1.000002 728 Gtid 1 478 GTID 0-1-2 mysqld-relay-bin-master1.000002 766 Query 1 559 create database db1 mysqld-relay-bin-master1.000002 847 Gtid 1 597 GTID 0-1-3 mysqld-relay-bin-master1.000002 885 Query 1 750 use `db1`; create table t1 (i int auto_increment, f1 varchar(16), primary key pk (i,f1)) engine=MyISAM mysqld-relay-bin-master1.000002 1038 Gtid 1 788 BEGIN GTID 0-1-4 mysqld-relay-bin-master1.000002 1076 Intvar 1 816 INSERT_ID=1 mysqld-relay-bin-master1.000002 1104 Query 1 920 use `db1`; insert into t1 (f1) values ('one'),('two') mysqld-relay-bin-master1.000002 1208 Query 1 988 COMMIT change master 'master1' to master_port=MYPORT_2, master_host='127.0.0.1', master_user='root'; ERROR HY000: This operation cannot be performed as you have a running slave 'master1'; run STOP SLAVE 'master1' first change master to master_port=MYPORT_2, master_host='127.0.0.1', master_user='root'; ERROR HY000: This operation cannot be performed as you have a running slave 'master1'; run STOP SLAVE 'master1' first change master 'master2' to master_port=MYPORT_1, master_host='127.0.0.1', master_user='root'; ERROR HY000: Connection 'master2' conflicts with existing connection 'master1' set default_master_connection = ''; change master to master_port=MYPORT_2, master_host='127.0.0.1', master_user='root'; start slave; include/wait_for_slave_to_start.inc show all slaves status; Connection_name Slave_SQL_State Slave_IO_State Master_Host Master_User Master_Port Connect_Retry Master_Log_File Read_Master_Log_Pos Relay_Log_File Relay_Log_Pos Relay_Master_Log_File Slave_IO_Running Slave_SQL_Running Replicate_Do_DB Replicate_Ignore_DB Replicate_Do_Table Replicate_Ignore_Table Replicate_Wild_Do_Table Replicate_Wild_Ignore_Table Last_Errno Last_Error Skip_Counter Exec_Master_Log_Pos Relay_Log_Space Until_Condition Until_Log_File Until_Log_Pos Master_SSL_Allowed Master_SSL_CA_File Master_SSL_CA_Path Master_SSL_Cert Master_SSL_Cipher Master_SSL_Key Seconds_Behind_Master Master_SSL_Verify_Server_Cert Last_IO_Errno Last_IO_Error Last_SQL_Errno Last_SQL_Error Replicate_Ignore_Server_Ids Master_Server_Id Master_SSL_Crl Master_SSL_Crlpath Using_Gtid Gtid_IO_Pos Replicate_Do_Domain_Ids Replicate_Ignore_Domain_Ids Retried_transactions Max_relay_log_size Executed_log_entries Slave_received_heartbeats Slave_heartbeat_period Gtid_Slave_Pos Slave has read all relay log; waiting for the slave I/O thread to update it Waiting for master to send event 127.0.0.1 root MYPORT_2 60 master-bin.000001 313 mysqld-relay-bin.000002 601 master-bin.000001 Yes Yes 0 0 313 899 None 0 No 0 No 0 0 2 No 0 1073741824 7 0 60.000 0-1-4 master1 Slave has read all relay log; waiting for the slave I/O thread to update it Waiting for master to send event 127.0.0.1 root MYPORT_1 60 master-bin.000001 988 mysqld-relay-bin-master1.000002 1276 master-bin.000001 Yes Yes 0 0 988 1582 None 0 No 0 No 0 0 1 No 0 1073741824 17 0 60.000 0-1-4 insert into t1 (f1) values ('three'); drop database if exists db2; create database db2; use db2; create table t1 (pk int auto_increment primary key, f1 int) engine=InnoDB; begin; insert into t1 (f1) values (1),(2); select * from db1.t1; i f1 1 one 2 two 3 three select * from db2.t1; pk f1 commit; select * from db2.t1; pk f1 1 1 2 2 flush logs; purge binary logs to 'master-bin.000002'; show binary logs; Log_name File_size master-bin.000002 367 insert into t1 (f1) values ('four'); create table db1.t3 (f1 int) engine=InnoDB; show all slaves status; Connection_name Slave_SQL_State Slave_IO_State Master_Host Master_User Master_Port Connect_Retry Master_Log_File Read_Master_Log_Pos Relay_Log_File Relay_Log_Pos Relay_Master_Log_File Slave_IO_Running Slave_SQL_Running Replicate_Do_DB Replicate_Ignore_DB Replicate_Do_Table Replicate_Ignore_Table Replicate_Wild_Do_Table Replicate_Wild_Ignore_Table Last_Errno Last_Error Skip_Counter Exec_Master_Log_Pos Relay_Log_Space Until_Condition Until_Log_File Until_Log_Pos Master_SSL_Allowed Master_SSL_CA_File Master_SSL_CA_Path Master_SSL_Cert Master_SSL_Cipher Master_SSL_Key Seconds_Behind_Master Master_SSL_Verify_Server_Cert Last_IO_Errno Last_IO_Error Last_SQL_Errno Last_SQL_Error Replicate_Ignore_Server_Ids Master_Server_Id Master_SSL_Crl Master_SSL_Crlpath Using_Gtid Gtid_IO_Pos Replicate_Do_Domain_Ids Replicate_Ignore_Domain_Ids Retried_transactions Max_relay_log_size Executed_log_entries Slave_received_heartbeats Slave_heartbeat_period Gtid_Slave_Pos Slave has read all relay log; waiting for the slave I/O thread to update it Waiting for master to send event 127.0.0.1 root MYPORT_2 60 master-bin.000001 921 mysqld-relay-bin.000002 1209 master-bin.000001 Yes Yes 0 0 921 1507 None 0 No 0 No 0 0 2 No 0 1073741824 17 0 60.000 0-1-7 master1 Slave has read all relay log; waiting for the slave I/O thread to update it Waiting for master to send event 127.0.0.1 root MYPORT_1 60 master-bin.000002 740 mysqld-relay-bin-master1.000004 1028 master-bin.000002 Yes Yes 0 0 740 1378 None 0 No 0 No 0 0 1 No 0 1073741824 37 0 60.000 0-1-7 select * from db1.t1; i f1 1 one 2 two 3 three 4 four show relaylog events; Log_name Pos Event_type Server_id End_log_pos Info mysqld-relay-bin.000001 4 Format_desc 3 248 Server version mysqld-relay-bin.000001 248 Rotate 3 298 mysqld-relay-bin.000002;pos=4 show relaylog events in 'mysqld-relay-bin.000002'; Log_name Pos Event_type Server_id End_log_pos Info mysqld-relay-bin.000002 4 Format_desc 3 248 Server version mysqld-relay-bin.000002 248 Rotate 2 0 master-bin.000001;pos=4 mysqld-relay-bin.000002 292 Format_desc 2 248 Server version mysqld-relay-bin.000002 536 Gtid_list 2 273 [] mysqld-relay-bin.000002 561 Binlog_checkpoint 2 313 master-bin.000001 mysqld-relay-bin.000002 601 Gtid 2 351 GTID 0-2-1 mysqld-relay-bin.000002 639 Query 2 440 drop database if exists db2 mysqld-relay-bin.000002 728 Gtid 2 478 GTID 0-2-2 mysqld-relay-bin.000002 766 Query 2 559 create database db2 mysqld-relay-bin.000002 847 Gtid 2 597 GTID 0-2-3 mysqld-relay-bin.000002 885 Query 2 732 use `db2`; create table t1 (pk int auto_increment primary key, f1 int) engine=InnoDB mysqld-relay-bin.000002 1020 Gtid 2 770 BEGIN GTID 0-2-4 mysqld-relay-bin.000002 1058 Intvar 2 798 INSERT_ID=1 mysqld-relay-bin.000002 1086 Query 2 894 use `db2`; insert into t1 (f1) values (1),(2) mysqld-relay-bin.000002 1182 Xid 2 921 COMMIT /* xid= */ stop slave io_thread; show status like 'Slave_running'; Variable_name Value Slave_running OFF set default_master_connection = 'master1'; show status like 'Slave_running'; Variable_name Value Slave_running ON drop database db1; drop database db2; include/reset_master_slave.inc drop database db1; include/reset_master_slave.inc drop database db2; include/reset_master_slave.inc