Replicate data into Azure Database for MySQL

Data-in Replication allows you to synchronize data from an external MySQL server into the Azure Database for MySQL service. The external server can be on-premises, in virtual machines, or a database service hosted by other cloud providers. Data-in Replication is based on the binary log (binlog) file position-based replication native to MySQL. To learn more about binlog replication, see the MySQL binlog replication overview.

When to use Data-in Replication

The main scenarios to consider using Data-in Replication are:

  • Hybrid Data Synchronization: With Data-in Replication, you can keep data synchronized between your on-premises servers and Azure Database for MySQL. This synchronization is useful for creating hybrid applications. This method is appealing when you have an existing local database server but want to move the data to a region closer to end users.
  • Multi-Cloud Synchronization: For complex cloud solutions, use Data-in Replication to synchronize data between Azure Database for MySQL and different cloud providers, including virtual machines and database services hosted in those clouds.

For migration scenarios, use the Azure Database Migration Service(DMS).

Limitations and considerations

Data not replicated

The mysql system database on the source server isn't replicated. Changes to accounts and permissions on the source server aren't replicated. If you create an account on the source server and this account needs to access the replica server, manually create the same account on the replica server side. To understand what tables are contained in the system database, see the MySQL manual.

Filtering

To skip replicating tables from your source server (hosted on-premises, in virtual machines, or a database service hosted by other cloud providers), the replicate_wild_ignore_table parameter is supported. Optionally, update this parameter on the replica server hosted in Azure using the Azure portal or Azure CLI.

Review the MySQL documentation to learn more about this parameter.

Requirements

  • The source server version must be at least MySQL version 5.6.
  • The source and replica server versions must be the same. For example, both must be MySQL version 5.6 or both must be MySQL version 5.7.
  • Each table must have a primary key.
  • Source server should use the MySQL InnoDB engine.
  • User must have permissions to configure binary logging and create new users on the source server.
  • If the source server has SSL enabled, ensure the SSL CA certificate provided for the domain has been included in the mysql.az_replication_change_master stored procedure. Refer to the following examples and the master_ssl_ca parameter.
  • Ensure the source server's IP address has been added to the Azure Database for MySQL replica server's firewall rules. Update firewall rules using the Azure portal or Azure CLI.
  • Ensure the machine hosting the source server allows both inbound and outbound traffic on port 3306.
  • Ensure the the source server has a public IP address, the DNS is publicly accessible, or has a fully qualified domain name (FQDN).

Other

  • Data-in replication is only supported in General Purpose and Memory Optimized pricing tiers.
  • Global transaction identifiers (GTID) are not supported.

Next steps