How does MySQL replication works?

What is MySQL replication configuration?

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). … However, general principles of setting up the MySQL master-slave replication on the same machine are the same for all operating systems.

Is MySQL replication push or pull?

Each replica that connects to the source requests a copy of the binary log. That is, it pulls the data from the source, rather than the source pushing the data to the replica.

Is MySQL replication real time?

MySQL replication is a real-time mechanism that automatically copies or replicates data from one server to another backup server. Database administrators can use the master-slave replication procedure to replicate or copy data from multiple servers at the same time.

How does MySQL master master replication works?

Master-master replication (more generally — multi-master replication) conceptually works by assuming that conflicts are not common and only keeping the entire system loosely consistent, asynchonously communication updates between masters, which ends up violating basic ACID properties.

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What are the two basic styles of data replication?

Replication Sites

Replication environments support two basic types of sites: master sites and snapshot sites. A master site maintains a complete copy of all objects in a replication group.

What is the main MySQL program that does all the data handling is called?

–> The main MySQL program that does all the data handling is called mysqld.

What is MySQL Binlog replication?

This section describes replication between MySQL servers based on the binary log file position method, where the MySQL instance operating as the source (where the database changes originate) writes updates and changes as “events” to the binary log. … Each replica receives a copy of the entire contents of the binary log.

What is MySQL High Availability?

MySQL Servers with Group Replication to replicate data to all members of the cluster while providing fault tolerance, automated failover, and elasticity. … MySQL Router to ensure client requests are load balanced and routed to the correct servers in case of any database failures.

What is Relay log file in MySQL?

The relay log, like the binary log, consists of a set of numbered files containing events that describe database changes, and an index file that contains the names of all used relay log files. The term “relay log file” generally denotes an individual numbered file containing database events.

Is MySQL replication asynchronous?

MySQL replication by default is asynchronous. The source writes events to its binary log and replicas request them when they are ready. The source does not know whether or when a replica has retrieved and processed the transactions, and there is no guarantee that any event ever reaches any replica.

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How make MySQL replicate faster?

Speed up slave replication on large database / quickly spawn…

  1. Create a slave server.
  2. Load in a mysql dump of the master.
  3. Start the slave.
  4. Wait for slave replication to sync w/ master.
  5. Place slave server in production.

What causes replication lag?

Replication lag occurs when the slaves (or secondaries) cannot keep up with the updates occuring on the master (or primary). Unapplied changes accumulate in the slaves’ relay logs and the version of the database on the slaves becomes increasingly different from that of the master.