关闭GTID

MySQL5.7在线开启/关闭GTID环境介绍
Part1:写在最前截止本文撰写当日，MySQL5.7.16是官网的最新稳定版，本文将用MySQL5.7.16来进行演示。从MySQL5.6开始，支持了GTID复制模式，这种模式其实是把双刃剑，虽然容易搭建主从复制了，但使用不当，就容易出现一些错误，例如error 1236。在MySQL5.6如果开启GTID模式，需要在my.cnf中加入以下几个参数：①log-bin=mysql-bin②binlog_format=row③log_slave_updates=1④gtid_mode=ON⑤enforce_gtid_consistency=ONWarning:警告这里的一些参数不是动态参数，也就是需要重启mysql才能生效。Part2:环境[root@HE1 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 4
Server version: 5.7.16-log MySQL Community Server （GPL）

Copyright （c） 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type "help;" or "h" for help. Type "c" to clear the current input statement.

mysql> select version（）;
+------------+
| version（） |
+------------+
| 5.7.16-log |
+------------+
1 row in set （0.00 sec）
mysql> show global variables like "log_slave%";
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| log_slave_updates | OFF |
+-------------------+-------+
1 row in set （0.00 sec）MySQL5.6开启GTID需要开启log_slave_updates参数，否则启动报错，而5.7不在需要开启该参数。实战
Part1:搭建传统复制模式本文环境HE1为从，HE3为主库[root@HE1 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 7
Server version: 5.7.16-log MySQL Community Server （GPL）

Copyright （c） 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type "help;" or "h" for help. Type "c" to clear the current input statement.

mysql> show slave statusG
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.250
Master_User: mysync
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 1694
Relay_Log_File: HE1-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000002
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: 1694
Relay_Log_Space: 525
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: 1250
Master_UUID: 82b160c7-9a8f-11e6-8412-000c29c6361d
Master_Info_File: /data/mysql/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:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set （0.00 sec）Part2:传统复制模式切换为GTID①主库从库都需执行以下命令mysql> set global gtid_mode="OFF_PERMISSIVE";
Query OK, 0 rows affected （0.01 sec）
mysql> set global gtid_mode="ON_PERMISSIVE";
Query OK, 0 rows affected （0.01 sec）
mysql> set global enforce_gtid_consistency=ON;
Query OK, 0 rows affected （0.00 sec）
mysql> set global gtid_mode="ON";
Query OK, 0 rows affected （0.00 sec） ②主库插数从库执行mysql> show master status;
+------------------+----------+--------------+------------------+----------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+----------------------------------------+
| mysql-bin.000005 | 154 | | | 82b160c7-9a8f-11e6-8412-000c29c6361d:1 |
+------------------+----------+--------------+------------------+----------------------------------------+
1 row in set （0.00 sec）可以看到gtid_set下面有数了，这说明已经开启了gtid模式Part3:GTID变更为传统模式mysql> stop slave;-----从库执行
Query OK, 0 rows affected （0.00 sec）

mysql> set global gtid_mode="ON_PERMISSIVE";
Query OK, 0 rows affected （0.00 sec）

mysql> set global gtid_mode="OFF_PERMISSIVE";
Query OK, 0 rows affected （0.01 sec）

mysql> CHANGE MASTER TO MASTER_AUTO_POSITION=0;
Query OK, 0 rows affected （0.05 sec）

mysql> set global gtid_mode="OFF";
Query OK, 0 rows affected （0.00 sec）

mysql> start slave;
Query OK, 0 rows affected （0.00 sec）

mysql> show variables like "%gtid%";
+----------------------------------+----------------------------------------+
| Variable_name | Value |
+----------------------------------+----------------------------------------+
| binlog_gtid_simple_recovery | ON |
| enforce_gtid_consistency | ON |
| gtid_executed_compression_period | 1000 |
| gtid_mode | OFF |
| gtid_next | AUTOMATIC |
| gtid_owned | |
| gtid_purged | 82b160c7-9a8f-11e6-8412-000c29c6361d:1 |
| session_track_gtids | OFF |
+----------------------------------+----------------------------------------+
8 rows in set （0.01 sec）
可以看到这里GTID模式已经关了，下面再次开启GTID模式来观察id的变化mysql> set global gtid_mode="OFF_PERMISSIVE";
Query OK, 0 rows affected （0.01 sec）
mysql> set global gtid_mode="ON_PERMISSIVE";
Query OK, 0 rows affected （0.01 sec）
mysql> set global enforce_gtid_consistency=ON;
Query OK, 0 rows affected （0.00 sec）
mysql> set global gtid_mode="ON";
Query OK, 0 rows affected （0.01 sec）
mysql>
mysql>
mysql> show variables like "%gtid%";
+----------------------------------+----------------------------------------+
| Variable_name | Value |
+----------------------------------+----------------------------------------+
| binlog_gtid_simple_recovery | ON |
| enforce_gtid_consistency | ON |
| gtid_executed_compression_period | 1000 |
| gtid_mode | ON |
| gtid_next | AUTOMATIC |
| gtid_owned | |
| gtid_purged | 82b160c7-9a8f-11e6-8412-000c29c6361d:1 |
| session_track_gtids | OFF |
+----------------------------------+----------------------------------------+
8 rows in set （0.00 sec）

主库做操作，从库执行如下命令会看到gtid_set的值在变化
mysql> show master status;
+------------------+----------+--------------+------------------+------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+------------------------------------------+
| mysql-bin.000011 | 154 | | | 82b160c7-9a8f-11e6-8412-000c29c6361d:1-2 |
+------------------+----------+--------------+------------------+------------------------------------------+
1 row in set （0.00 sec）

mysql> show master status;
+------------------+----------+--------------+------------------+------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+------------------------------------------+
| mysql-bin.000011 | 154 | | | 82b160c7-9a8f-11e6-8412-000c29c6361d:1-3 |
+------------------+----------+--------------+------------------+------------------------------------------+
1 row in set （0.00 sec）本文永久更新链接地址