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How does master and slave replication work in MySQL?
MySQL Master-Slave Replication on the Same Machine. MySQL replication is a process that enables data from one MySQL database server (the master) to be copied automatically to one or more MySQL database servers (the slaves).
Can a slave connect to a Master MySQL instance?
Restart the master MySQL instance in order for these changes to take effect: In order for the slave to connect to the master with the correct replication privileges, a new user should be created on the master. Connect to the master instance using the MySQL client with the appropriate host and port:
How is data copied from one MySQL server to another?
MySQL replication is a process that enables data from one MySQL database server (the master) to be copied automatically to one or more MySQL database servers (the slaves).
How to replicate more than one database in MySQL?
To specify more than one database, use this option multiple times, once for each database; however, doing so does not replicate cross-database statements such as UPDATE some_db.some_table SET foo=’bar’ while a different database (or no database) is selected. Thanks for contributing an answer to Stack Overflow!
Why do I need a slave in MySQL?
The slaves can also be used for data accessibility to reduce the load on the master database. One of the main purposes of going for a master-slave replication system is to have a standby system with a live backup that can be promoted as the master when the original master server crashes.
How to setup a second MySQL instance as a slave?
To setup the second MySQL instance as a slave, set server-id to 2, as it must be different to the master’s server-id. Since both instances will run on the same machine, set port for the second instance to 3307since it has to be different from the port used for the first instance, which is 3306 by default.
How does a slave connect to a master server?
Salves connect to the master and asks for the data. The slave servers get the masters binary log. Slaves then apply the binary log to its realy log. The relay log is read by the SQL thread process and it applies all the operations/data to the slave’s database and its binary log.
How many slave nodes do I need for MySQL?
One master node and two slave nodes. Minimum 2 Nodes – one master & one slave. [ Centos/Redhat 7 or greater] Connectivity to install packages using yum or through corp proxy if any. Root access to the servers. Each servers firewall should allow traffic on ports 22 and 3306.
To setup the second MySQL instance as a slave, set server-id to 2, as it must be different to the master’s server-id. Since both instances will run on the same machine, set port for the second instance to 3307 since it has to be different from the port used for the first instance, which is 3306 by default.
How many nodes do I need for MySQL replication?
For the tutorial purpose, we will use three Nodes for the MySQL replication cluster. One master node and two slave nodes. Minimum 2 Nodes – one master & one slave. [ Centos/Redhat 7 or greater] Connectivity to install packages using yum or through corp proxy if any. Root access to the servers.
Can you use dump slave in MySQL 5.5?
You cannot use –master-data=2 because the backup is from the Slave and not the Master. If you upgrade MySQL 5.5, you could use –dump-slave in the MYSQLDUMP_OPTIONS to capture the Master’s binary log and position from the SHOW SLAVE STATUS\\G.
Can you use MySQL on the same machine?
However, general principles of setting up the MySQL master-slave replication on the same machine are the same for all operating systems. If you already have one instance of MySQL database installed on your machine, you can skip this step.