reset masert； reset slave； reset slave all；
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一：reset master (需要RELOAD 权限)
1. reset master 命令
1) 5.7 及一下版本
reset master;
2) 8.0 版本
RESET MASTER [TO binary_log_file_index_number]
# 8.0 开始 reset master 可以通过 to 指定一个合法的序号(该需要不能超过binlog序号的最大值)，这样reset master后binlog序号不是从.000001 开始，而是从你指定的序号开始，例如：
RESET MASTER TO 1234;
SHOW BINARY LOGS;
+-------------------+-----------+-----------+
| Log_name | File_size | Encrypted |
+-------------------+-----------+-----------+
| source-bin.001234 | 154 | No |
+-------------------+-----------+-----------+2."reset master;" 做了哪些动作
1)对于启用binlog的实例，"reset master;" 会删除所有binlog index file中记录的binlog，重置 binlog index file，重新创建一个新的binlog(序号从000001开始，如果想从指定的需要开始，可以使用 reset master to 155; 这样重置后binlog序号从.000155开始)
2)对于启用 GTID 模式的实例，reset slave 会把 gtid_purged， gtid_executed 变量设置为空，mysql.gtid_executed 表也会被清空
3)如果你的架构是主从模式正在运行，在主库和从库上都不要轻易执行"reset master;" 否则从库复制会出现异常
二. "reset slave;"
reset slave(需要RELOAD权限)是各版本Mysql都有的功能，必须在stop slave之后使用。主要做：
1. 删除master.info和relay-log.info文件；
2. 删除所有的relay log（包括还没有应用完的日志），创建一个新的relay log文件；
3. 会把 change master 指定的 MASTER_DELAY 参数设置为0
4. reset slave 不会清空 gtid_executed 和 gtid_purged 变量，也不会清空 mysql.gtid_executed 表(如果想清空 GTID相关信息得使用 reset master)
5.mysql 5.6.7之后，reset slave会隐式提交事务。
6. 清理复制信息
6.1 5.7.24 及以上版本
1) master-info-repository = TABLE
NOTE1：master-info-repository 指定为 TABLE 的情况下，"reset slave;" 命令不会清理保存在mysql.slave_master_info表中的复制参数
NOTE2：不会清理内存中保存的复制信息，show slave status\\G; 依然有输出，"start slave;" 可以恢复复制。
2) master-info-repository = FILE
Master_Info_File: /app/mysql/mysql3308/data/master.info
NOTE1："reset slave;" 删除master.info（start slave;后会创建master.info）
NOTE2：不会清理内存中保存的复制信息，show slave status\\G; 依然有输出，"start slave;" 可以恢复复制。"reset slave;" 后重启实例复制参数丢失需要重新 change master
6.2 5.7.24 以下版本
1) master-info-repository = TABLE
NOTE1：master-info-repository 指定为 TABLE 的情况下，"reset slave; "命令会清理保存在mysql.slave_master_info表中的复制参数，这时重启实例会丢失复制信息，需要重新change master
NOTE2：不会清理内存中保存的复制信息，show slave status\\G; 依然有输出，"start slave;" 可以恢复复制。
2) master-info-repository = FILE
Master_Info_File: /app/mysql/mysql3308/data/master.info
NOTE1："reset slave;" 删除master.info（"start slave;"后会创建master.info）
NOTE2：不会清理内存中保存的复制信息，"show slave status\\G; "依然有输出，"start slave;" 可以恢复复制。"reset slave;" 后重启实例复制参数丢失需要重新 change master
三：reset slave all; 命令
从Mysql 5.6.3 开始，reset slave 多了一个all参数。如果不加all参数，那么所有的连接信息仍然保留在内存中，包括主库地址、端口、用户、密码等。这样可以直接运行start slave命令而不必重新输入change master to命令，而运行show slave status也仍和没有运行reset slave一样，有正常的输出。但如果加了all参数，那么这些内存中的数据也会被清除掉，运行show slave status就输出为空了。
1)清除内存中的复制参数
2)清除mysql.slave_master_info表中的复制参数(如果master-info-repository = TABLE)
3)删除/app/mysql/mysql3308/data/master.info(如果master-info-repository = FILE)
7. 对于多源复制(5.7开始支持多源复制) 与 reset slave; reset slave all;
1)使用多源复制时，从库 master_info_repository 参数必须为 TABLE(对应主库的master_info_repository 参数无特殊要求)
ERROR 3077 (HY000): To have multiple channels, repository cannot be of type FILE; Please check the repository configuration and convert them to TABLE.2)reset slave all;
#因为多源复制 master_info_repository 必须指定为 TABLE,这时 reset slave不会清除任何复制参数(内存中和mysql.slave_master_info表中)，所以下面主要讲 reset slave all; 在多源复制的使用
reset slave/reset slave all 命令可以 for channel channel_name指定具体的 channel。如果reset slave all;没有指定 for channel 则会把所有channel 连接清空(reset slave; 不会清除复制参数)，示例如下：
mysql> show slave status\\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 127.0.0.1
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: 3306-bin.000003
Read_Master_Log_Pos: 682
Relay_Log_File: relay_3308-channel_1.000004
Relay_Log_Pos: 411
Relay_Master_Log_File: 3306-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 682
Relay_Log_Space: 880
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 34d1b759-24ee-11ed-82c4-fa163efcbfd5
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 34d1b759-24ee-11ed-82c4-fa163efcbfd5:1-5,
88cac428-24ee-11ed-9ec5-fa163efcbfd5:1-2
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: channel_1
Master_TLS_Version:
*************************** 2. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 127.0.0.1
Master_User: repl
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: 3307-bin.000001
Read_Master_Log_Pos: 1182
Relay_Log_File: relay_3308-channel_2.000003
Relay_Log_Pos: 411
Relay_Master_Log_File: 3307-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 1182
Relay_Log_Space: 800
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2
Master_UUID: 88cac428-24ee-11ed-9ec5-fa163efcbfd5
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 34d1b759-24ee-11ed-82c4-fa163efcbfd5:1-5,
88cac428-24ee-11ed-9ec5-fa163efcbfd5:1-2
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: channel_2
Master_TLS_Version:
2 rows in set (0.00 sec)
ERROR:
No query specified
mysql> reset slave all for channel 'channel_2';
ERROR 3081 (HY000): This operation cannot be performed with running replication threads; run STOP SLAVE FOR CHANNEL 'channel_2' first
mysql> stop slave for channel 'channel_2';
Query OK, 0 rows affected (0.00 sec)
mysql> reset slave all for channel 'channel_2';
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 127.0.0.1
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: 3306-bin.000003
Read_Master_Log_Pos: 682
Relay_Log_File: relay_3308-channel_1.000004
Relay_Log_Pos: 411
Relay_Master_Log_File: 3306-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 682
Relay_Log_Space: 880
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 34d1b759-24ee-11ed-82c4-fa163efcbfd5
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 34d1b759-24ee-11ed-82c4-fa163efcbfd5:1-5,
88cac428-24ee-11ed-9ec5-fa163efcbfd5:1-2
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: channel_1
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
mysql> CHANGE MASTER TO
-> MASTER_HOST = '127.0.0.1',
-> MASTER_PORT = 3307,
-> MASTER_USER = 'repl',
-> MASTER_PASSWORD = 'root',
-> MASTER_AUTO_POSITION = 1
-> FOR CHANNEL 'channel_2';
Query OK, 0 rows affected, 1 warning (0.03 sec)
mysql> start slave for channel 'channel_2';
Query OK, 0 rows affected (0.01 sec)
mysql> show slave status\\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 127.0.0.1
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: 3306-bin.000003
Read_Master_Log_Pos: 682
Relay_Log_File: relay_3308-channel_1.000004
Relay_Log_Pos: 411
Relay_Master_Log_File: 3306-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 682
Relay_Log_Space: 880
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 34d1b759-24ee-11ed-82c4-fa163efcbfd5
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 34d1b759-24ee-11ed-82c4-fa163efcbfd5:1-5,
88cac428-24ee-11ed-9ec5-fa163efcbfd5:1-2
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: channel_1
Master_TLS_Version:
*************************** 2. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 127.0.0.1
Master_User: repl
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: 3307-bin.000001
Read_Master_Log_Pos: 1182
Relay_Log_File: relay_3308-channel_2.000002
Relay_Log_Pos: 411
Relay_Master_Log_File: 3307-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 1182
Relay_Log_Space: 623
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2
Master_UUID: 88cac428-24ee-11ed-9ec5-fa163efcbfd5
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: 34d1b759-24ee-11ed-82c4-fa163efcbfd5:1-5,
88cac428-24ee-11ed-9ec5-fa163efcbfd5:1-2
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name: channel_2
Master_TLS_Version:
2 rows in set (0.00 sec)
ERROR:
No query specified
mysql> reset slave all;
ERROR 3081 (HY000): This operation cannot be performed with running replication threads; run STOP SLAVE FOR CHANNEL 'channel_1' first
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)
mysql> reset slave all;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\\G;
Empty set (0.00 sec)
ERROR:
No query specified
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