The SELECT statement doesn't change any data, so this event is not recorded and it's not needed by the replicated server. This includes any UPDATE, INSERT, and DELETE statement. A writable event, if you recall, is any statement that changes data. Your master database writes each writable event to the binary log file. It's this file that feeds the slave server, so you should have a relatively large binary log file to ensure that you keep records available for replication. You can also set the size of this log to determine how many days of data it stores. This file is necessary for the master server in a replicated environment. With these advantages in mind, let's take a look at how you can set up replication on a MySQL server environment. However, if the replication server is a foundation for important transaction used for production, lag time should be closely monitored to avoid any data integrity issues. It's common to have a 24-hour lag between production data and reporting tools, so lag time isn't a main concern. Lag is not a large concern if you only use a replicated database for a backup or for services such as reporting. The MySQL servers have a load balancer between the application and the databases, and the load balancer sends requests to the database that can handle each transaction with the best performance.Įven with the fastest network, you have replication lag, and this should be considered when you set up your environment. With a master-master setup, you can create a load balanced environment where the servers share the load between multiple transactions. You can also set up master-master solutions, but this is for more advanced enterprise platforms. The basic configuration is master-slave where the master handles the write transactions and the slave server only reads the data into a mirrored database. With replication, you can restore your master server with replicated data instead of digging into backup files. Replication is also a type of disaster recovery database backup that's more efficient than storing data to disks. Writes are done synchronously for one physical server to the hard drive, so writing to the network greatly increases performance. With replication, commits are first written to the network instead of to the hard drive like they do with one physical server. Most businesses use transactional database tables, which means the preferred storage engine is InnoDB. This is generally the way data centers work – they connect a user to the closest available server to reduce response times. When you spread data across multiple servers, you can connect different applications to each server to improve performance. Second, performance actually increases even though complexity would make most administrators think that it would cause performance degradation. This includes if the network fails or server hardware crashes the physical machine. If the master server fails, you can temporarily switch the connection to the replicated server to provide stability during a critical outage. However, there are several benefits for the business and database administrators.įirst, your applications no longer rely on one database server. It generally takes more maintenance and man hours to configure and monitor the replication service. Replication requires another MySQL server, and it requires additional configurations. You might first wonder if there are any benefits to creating complexity among your database servers.
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This article explains the benefits of replication and how to set up your MySQL environment. The configuration is a "master-slave" setup where the master database is the original storage machine and the slave is the recipient of the replicated data. Replication configurations assume that you have two different MySQL servers set up. This server is usually a secondary physical machine that imports data from the main publisher.
For larger database setups, companies use replication to ensure that data is passed to another server.
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