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

The following table 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)	Full Full+Incremental	From MySQL to GaussDB(for MySQL)
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	GeminiDB Mongo	Full Full+Incremental: Replica set -> Replica set Replica set -> Cluster Cluster -> Cluster	From MongoDB to GeminiDB Mongo
DDS	On-premises MongoDB databases MongoDB databases on an ECS MongoDB database on other clouds	Full Full+Incremental	From DDS to MongoDB
DDM	DDM	Full Full+Incremental	From MySQL Schema and Logic Table to DDM
On-premises official open-source single-node or master/standby Redis ECS-hosted official open-source single-node or master/standby Redis	GeminiDB Redis	Full Full+Incremental	From Redis to GeminiDB Redis
On-premises open-source Redis Cluster ECS-hosted open-source Redis Cluster	GeminiDB Redis	Full+Incremental	From Redis Cluster to GeminiDB Redis
GeminiDB Redis	On-premises open-source Codis ECS-hosted open-source Codis On-premises single-node or master/standby Redis ECS-hosted single-node or master/standby Redis GeminiDB Redis	Full+Incremental	From GeminiDB Redis to Redis
GeminiDB Redis	On-premises Redis Cluster ECS-hosted Redis Cluster	Full+Incremental	From GeminiDB Redis to Redis Cluster

Other Cloud Migration Solutions

DRS allows you to migrate data from other cloud databases (such as AWS RDS for MySQL and Aurora for MySQL) to Huawei Cloud databases (such as RDS for MySQL).

**Table 2** Migration solutions
Source Database Cloud Vendor	Source Database Type	Destination Database (Huawei Cloud)	Solution
AWS	RDS for MySQL	RDS for MySQL	From MySQL to MySQL
AWS	RDS for MySQL	GaussDB(for MySQL)	From MySQL to GaussDB(for MySQL)
AWS	Aurora for MySQL	RDS for MySQL	From MySQL to MySQL
AWS	Aurora for MySQL	GaussDB(for MySQL)	From MySQL to GaussDB(for MySQL)
Azure	Database for MySQL	RDS for MySQL	From MySQL to MySQL
Azure	Database for MySQL	GaussDB(for MySQL)	From MySQL to GaussDB(for MySQL)
Google	Cloud SQL for MySQL	RDS for MySQL	From MySQL to MySQL
Google	Cloud SQL for MySQL	GaussDB(for MySQL)	From MySQL to GaussDB(for MySQL)
Alibaba Cloud	ApsaraDB RDS for MySQL	RDS for MySQL	From MySQL to MySQL
Alibaba Cloud	ApsaraDB RDS for MySQL	GaussDB(for MySQL)	From MySQL to GaussDB(for MySQL)
Alibaba Cloud	PolarDB for MySQL	RDS for MySQL	From MySQL to MySQL
Alibaba Cloud	PolarDB for MySQL	GaussDB(for MySQL)	From MySQL to GaussDB(for MySQL)
Tencent Cloud	TencentDB for MySQL	RDS for MySQL	From MySQL to MySQL
Tencent Cloud	TencentDB for MySQL	GaussDB(for MySQL)	From MySQL to GaussDB(for MySQL)
Tencent Cloud	TDSQL-C for MySQL	RDS for MySQL	From MySQL to MySQL
Tencent Cloud	TDSQL-C for MySQL	GaussDB(for MySQL)	From MySQL to GaussDB(for MySQL)