MYSQL master-slave replication: exploring key parameters that cannot be synchronized in real time

MYSQL master-slave replication: exploring key parameters that cannot be synchronized in real time

1. master database operations

1. Full Database Export
Mysqldump-h192.168.1.6 -- all-databases-uroot-proot -- opt -- add-drop-database -- add-drop-table -- events -- triggers -- routines -- default-character-set = utf8 -- master-data = 2 -- single-transaction -- complete-insert -- quote-names -- log-error =/gyj/mysqldump2015051_log>/gyj/backup_2015051_mysql


2. Obtain the binlog location of mysql during export.
(Head-50 backup_20150520.mysql or tail-50 backup_20150520.mysql)


---- Change master to MASTER_LOG_FILE = 'binlog. 100', MASTER_LOG_POS = 000001;


3. Copy the backup of the master database to the slave Database
[Root @ uubee6 gyj] # scp backup_2015051_mysql root@192.168.1.8:/gyj/


Ii. Slave database operations
1. Clear the standby database (retain information_schema, cece_schema, and mysql databases), and then import the data of the primary database.
Check whether the slow log is disabled: set global slow_query_log = off;
If the import is not disabled, the following ERROR occurs: ERROR 1580 (HY000) at line 3405: You cannot 'drop' a log table if logging is enabled.


Mysql-h192.168.1.8-uroot-proot </gyj/backup_20150520.mysql



Iii. master database operations
1. Create and copy users
Grant replication slave on *. * TO 'repl' @ '%' identified by 'slavepass ';

 

Iv. Slave database operations

1. Configure the connection to the master database in the slave database and run the following command:

CHANGE MASTER TOMASTER_HOST='192.168.1.6',MASTER_USER='repl',MASTER_PASSWORD='slavepass',MASTER_PORT=3306,MASTER_LOG_FILE='binlog.000001',MASTER_LOG_POS=529372,MASTER_CONNECT_RETRY=10;

2. Start slave Database
Mysql> start slave;
Query OK, 0 rows affected (0.01 sec)




3. query the slave status:

mysql> show slave status\G;*************************** 1. row ***************************Slave_IO_State: Waiting for master to send eventMaster_Host: 192.168.1.6Master_User: replMaster_Port: 3306Connect_Retry: 10Master_Log_File: binlog.000001Read_Master_Log_Pos: 657284Relay_Log_File: relaylog.000002Relay_Log_Pos: 128192Relay_Master_Log_File: binlog.000001Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB:Replicate_Ignore_DB:Replicate_Do_Table:Replicate_Ignore_Table:Replicate_Wild_Do_Table:Replicate_Wild_Ignore_Table:Last_Errno: 0Last_Error:Skip_Counter: 0Exec_Master_Log_Pos: 657284Relay_Log_Space: 128358Until_Condition: NoneUntil_Log_File:Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_SSL_CA_File:Master_SSL_CA_Path:Master_SSL_Cert:Master_SSL_Cipher:Master_SSL_Key:Seconds_Behind_Master: 0Master_SSL_Verify_Server_Cert: NoLast_IO_Errno: 0Last_IO_Error:Last_SQL_Errno: 0Last_SQL_Error:Replicate_Ignore_Server_Ids:Master_Server_Id: 101Master_UUID: c811e75a-d875-11e4-8bb1-b083fede6c94Master_Info_File: /u01/my3306/data/master.infoSQL_Delay: 0SQL_Remaining_Delay: NULLSlave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update itMaster_Retry_Count: 86400Master_Bind:Last_IO_Error_Timestamp:Last_SQL_Error_Timestamp:Master_SSL_Crl:Master_SSL_Crlpath:Retrieved_Gtid_Set:Executed_Gtid_Set:Auto_Position: 01 row in set (0.00 sec)ERROR:No query specified

V. Test
1. master database operations

mysql> select * from t1;+------+| id |+------+| 1 |+------+1 row in set (0.00 sec)mysql> insert into t1 values(2);Query OK, 1 row affected (0.00 sec)mysql> commit;Query OK, 0 rows affected (0.00 sec)mysql> select * from t1;+------+| id |+------+| 1 || 2 |+------+2 rows in set (0.00 sec)

2. Slave database operations

mysql> select * from t1;+------+| id |+------+| 1 |+------+1 row in set (0.00 sec)

3. The slave database is not synchronized, But I operate flush logs in the slave database. The command can be synchronized!




4. Check the parameters of the master database:

mysql> show variables like '%autocommit%';+---------------+-------+| Variable_name | Value |+---------------+-------+| autocommit | ON |+---------------+-------+1 row in set (0.00 sec)mysql> show variables like '%innodb_flush_metho%';+---------------------+----------+| Variable_name | Value |+---------------------+----------+| innodb_flush_method | O_DIRECT |+---------------------+----------+1 row in set (0.00 sec)mysql> show variables like '%sync_binlog%';+---------------+-------+| Variable_name | Value |+---------------+-------+| sync_binlog | 100 |+---------------+-------+1 row in set (0.00 sec)

5. Find the cause: sync_binlog = 100. Set the parameter sync_binlog to 1 in the master database !!!
Set global sync_binlog = 1; --- it is best to change the my. cnf configuration file permanently.



6. Write down several common commands
Reset master;
Show master status \ G;
Show binlog events in 'binlog. 100 ';
Flush logs;