Migration Overview

With DRS, you can migrate data from sources to destinations in real time. You create a replication instance to connect to both the source and destination and configure objects to be migrated. DRS will help you compare metrics and data between source and destination, so you can determine the best time to switch to the destination database while minimizing service downtime.

DRS supports incremental migration, so you can replicate ongoing changes to keep sources and destinations in sync while minimizing the impact of service downtime and migration.

Figure 1 Real-time migration process

Supported Database Types

Table 1 lists the source database and destination database types supported by DRS in real-time migration.

**Table 1** Migration schemes
Source DB	Destination DB	Migration Type	Documentation
On-premises MySQL databases MySQL databases on an ECS MySQL databases on other clouds RDS for MySQL	RDS for MySQL	Full Full+Incremental	From MySQL to MySQL (To the cloud)
	DDM	Full Full+Incremental	From MySQL to DDM
	GaussDB(for MySQL) primary/standby	Full Full+Incremental	From MySQL to GaussDB(for MySQL) Primary/Standby
RDS for MySQL	On-premises MySQL databases MySQL databases on an ECS MySQL databases on other clouds	Full Full+Incremental	From MySQL to MySQL (Out of the cloud)
On-premises MongoDB databases MongoDB databases on an ECS MongoDB database on other clouds DDS	DDS	Full Full+Incremental	From MongoDB to DDS
On-premises MongoDB databases MongoDB databases on an ECS MongoDB database on other clouds	GaussDB(for Mongo)	Full Full+Incremental: Replica set -> Replica set Replica set -> Cluster Cluster -> Cluster	From MongoDB to GaussDB(for Mongo)
DDS	On-premises MongoDB databases MongoDB databases on an ECS MongoDB database on other clouds	Full Full+Incremental	From DDS to MongoDB
On-premises MyCAT middleware MyCAT middleware on an ECS DDM	DDM	Full Full+Incremental	From MySQL Schema and Logic Table to DDM

Next topic: To the Cloud

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