MySQL and PostgreSQL: real-time data synchronization and replication technology

MySQL and PostgreSQL: Real-time data synchronization and replication technology

Abstract:
In today's world of data-driven applications, real-time data synchronization and replication technology are becoming increasingly important. This technology can help us maintain data consistency across multiple databases and provide data backup and fault recovery capabilities. In this article, we will focus on real-time data synchronization and replication technology in two popular open source database systems, MySQL and PostgreSQL, and give corresponding code examples.

Introduction:
Real-time data synchronization and replication technology are key functions in modern database systems. Whether it is maintaining data consistency in a distributed system or providing reliability in data backup and failure recovery, data synchronization and replication play an important role. MySQL and PostgreSQL are two popular relational database systems, both of which provide powerful real-time data synchronization and replication capabilities. This article will focus on their use and give corresponding code examples.

1. MySQL real-time data synchronization and replication technology

MySQL provides a variety of real-time data synchronization and replication technologies, the most commonly used of which is Master-Slave Replication. Master-slave replication is an asynchronous replication technology that can synchronize changes in one MySQL database to multiple other MySQL database copies in real time.

Configuring MySQL master-slave replication involves the following steps:

1. Start the binary log (Binary Log) function on the primary database:

   [mysqld]
   log-bin=mysql-bin

2. Set the master server address, user name and password on the slave database:

   [mysqld]
   server-id=2
   log-slave-updates=1
   replicate-do-db=mydatabase
   master-host=master.example.com
   master-user=replication_user
   master-password=replication_password

3. Start the replication process on the slave database:

   START SLAVE;

Through the above steps, we can achieve real-time data synchronization and replication of the MySQL database. When performing a data writing operation, the writing operation will be recorded in the binary log and sent to the slave database for execution, thereby achieving data synchronization.

2. PostgreSQL real-time data synchronization and replication technology

PostgreSQL provides real-time data synchronization and replication technology based on log (WAL). In PostgreSQL, a log is a series of change operation records, including insert, update, and delete operations. By parsing and applying these change operations, the data can be synchronized to multiple other PostgreSQL databases in real time.

Configuring PostgreSQL real-time data synchronization and replication requires the following steps:

1. Enable the archive log (Archive Log) function on the main database:

   archive_mode = on
   archive_command = 'cp %p /path/to/archive/%f'

2. Set up the replication stream on the master database:

   wal_level = logical
   max_replication_slots = 10

3. Set up the configuration to connect to the master server on the slave database:

   primary_conninfo = 'host=master.example.com port=5432 user=replication_user password=replication_password'
   primary_slot_name = 'replication_slot'

4. Start the replication process on the slave database:

   pg_create_physical_replication_slot('replication_slot');

The above are the basic configuration steps for PostgreSQL to achieve real-time data synchronization and replication. Through these configurations, data change operations will be recorded in archive logs and synchronized to other PostgreSQL databases through replication streams.

Conclusion:
Real-time data synchronization and replication technology are very important for data consistency and reliability. MySQL and PostgreSQL are two popular open source database systems, both of which provide powerful real-time data synchronization and replication capabilities. This article describes their configuration and use, and provides corresponding code examples. Whether it is maintaining data consistency in distributed systems or providing reliability in data backup and failure recovery, real-time data synchronization and replication technology will play an important role. Readers can choose the appropriate technology according to their own needs, and refer to the corresponding documentation and code examples to practice.

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