Real-Time Migration

In real-time migration, you only need to configure the source database, destination database, and migration objects. DRS will help you compare and analyze data so you can determine when to migrate with minimal service disruption.

Supported Database Types

DRS supports migration between different DB engines. The following table lists the supported data sources. Self-built databases include on-premises databases and ECS databases.

Table 1 Database types

Migration Direction

Data Flow

Source DB

Destination DB

Destination DB Type

To the cloud

MySQL->MySQL

  • On-premises databases

  • ECS databases

  • Databases on other clouds

  • RDS MySQL DB instances

RDS MySQL DB instances

  • Single DB instance

  • Primary/Standby DB instance

To the cloud

MySQL -> GaussDB(for MySQL) primary/standby

  • On-premises databases

  • ECS databases

  • Databases on other clouds

  • RDS MySQL DB instances

  • GaussDB(for MySQL) instances

GaussDB(for MySQL) primary/standby

  • Primary/Standby DB instance

To the cloud

MongoDB->DDS

  • On-premises databases

  • ECS databases

  • Databases on other clouds

  • DDS DB instances

DDS DB instances

  • Cluster

  • Replica set

  • Single node

From the cloud

MySQL->MySQL

RDS MySQL DB instances

  • On-premises databases

  • ECS databases

  • Databases on other clouds

  • Single DB instance

  • Primary/Standby DB instance

From the cloud

DDS->MongoDB

DDS DB instances

  • On-premises databases

  • ECS databases

  • Databases on other clouds

  • DDS instances

  • Cluster

  • Replica set

  • Single node

Self-built -> Self-built

MySQL->MySQL

  • ECS databases

  • On-premises databases

  • ECS databases

  • On-premises databases

  • Single DB instance

  • Primary/Standby DB instance

Table 2 Database versions

Migration Direction

Data Flow

Source DB Version

Destination DB Version

To the cloud

MySQL->MySQL

  • MySQL 5.5.x

  • MySQL 5.6.x

  • MySQL 5.7.x

  • MySQL 8.0.x

  • MySQL 5.6.x

  • MySQL 5.7.x

  • MySQL 8.0.x

To the cloud

MongoDB->DDS

  • MongoDB 3.2.x

  • MongoDB 3.4.x

  • MongoDB 3.6.x

  • MongoDB 4.0.x

  • MongoDB 4.2.x

  • MongoDB 4.4.x

  • DDS 3.2.x

  • DDS 3.4.x

  • DDS 4.0.x

  • DDS 4.2.x

  • DDS 4.4.x

To the cloud

MySQL -> GaussDB(for MySQL) primary/standby

  • MySQL 5.6.x

  • MySQL 5.7.x

  • MySQL 8.0.x

GaussDB(for MySQL)-MySQL 8.0

From the cloud

MySQL->MySQL

  • MySQL 5.6.x

  • MySQL 5.7.x

  • MySQL 8.0.x

  • MySQL 5.6.x

  • MySQL 5.7.x

  • MySQL 8.0.x

From the cloud

DDS->MongoDB

  • DDS 3.2.x

  • DDS 3.4.x

  • DDS 4.0.x

  • DDS 4.2.x

  • DDS 4.4.x

  • MongoDB 3.2.x

  • MongoDB 3.4.x

  • MongoDB 3.6.x

  • MongoDB 4.0.x

  • MongoDB 4.2.x

  • MongoDB 4.4.x

Self-built -> Self-built

MySQL->MySQL

  • MySQL 5.5.x

  • MySQL 5.6.x

  • MySQL 5.7.x

  • MySQL 8.0.x

  • MySQL 5.6.x

  • MySQL 5.7.x

  • MySQL 8.0.x

Supported Migration Types

DRS supports two migration types: full migration and full+incremental migration.

This full migration type is suitable for scenarios where service interruption is acceptable. All objects and data in non-system databases are migrated to the destination database at one time. The objects that can be migrated include tables, views, stored procedures, and triggers.

The full+incremental migration type allows you to migrate data without interrupting services. After a full migration initializes the destination database, an incremental migration parses logs to ensure data consistency between the source and destination databases.

Table 3 Migration types

Migration Direction

Data Flow

Full Migration

Full+Incremental Migration

To the cloud

MySQL->MySQL

Supported

Supported

To the cloud

MySQL -> GaussDB(for MySQL) primary/standby

Supported

Supported

To the cloud

MongoDB->DDS

  • Replica set -> Single node

  • Replica set -> Replica set

  • Replica set -> Cluster

  • Single node -> Single node

  • Single node -> Replica set

  • Single node -> Cluster

  • Cluster -> Cluster

  • Replica set -> Single node

  • Replica set -> Replica set

  • Replica set -> Cluster

  • Single node -> Single node

  • Single node -> Replica set

  • Single node -> Cluster

Note

If you need to perform an incremental migration for a single-node instance, the source database must be the DDS single-node instance.

From the cloud

MySQL->MySQL

Supported

Supported

From the cloud

DDS->MongoDB

Supported

Supported

Note

If the source database is on a cluster instance, incremental migration is not supported.

Self-built -> Self-built

MySQL->MySQL

Supported

Supported

Supported Network Types

DRS supports data migration through a Virtual Private Cloud (VPC), Virtual Private Network (VPN), Direct Connect, or public network. Table 4 lists the application scenarios of each network type and required preparations, and Table 5 lists the supported network types of each migration scenario.

Table 4 Network types

Network Type

Application Scenario

Preparations

VPC

Migrations between cloud databases in the same region

  • The source and destination databases must be in the same region.

  • The source and destination databases can be in either the same VPC or in different VPCs.

  • If source and destination databases are in the same VPC, they can communicate with each other by default. Therefore, you do not need to configure a security group.

  • If the source and destination databases are not in the same VPC, the CIDR blocks of the source and destination databases cannot be duplicated or overlapped, and the source and destination databases are connected through a VPC peering connection. DRS automatically establishes a VPC peering connection through a single IP address when you test the network connectivity.

VPN

Migrations from on-premises databases to cloud databases or between cloud databases across regions

Establish a VPN connection between your local data center and the VPC that hosts the destination database. Before migration, ensure that the VPN network is accessible.

Direct Connect

Migrations from on-premises databases to cloud databases or between cloud databases across regions

Use a dedicated network connection to connect your data center to VPCs.

Public network

Migrations from on-premises or other cloud databases to destination databases

To ensure network connectivity between the source and destination databases, perform the following operations:

  1. Enable public accessibility.

    Enable public accessibility for the source database based on your service requirements.

  2. Configure security group rules.

    • Add the EIPs of the replication instance to the whitelist of the source database for inbound traffic.

    • If destination databases and the replication instance are in the same VPC, they can communicate with each other by default. You do not need to configure a security group.

    Note

    • The IP address on the Configure Source and Destination Databases page is the EIP of the replication instance.

    • If SSL is not enabled, migrating confidential data is not recommended.

Table 5 Supported network types

Migration Direction

Data Flow

VPC

Public Network

VPN or Direct Connect

To the cloud

MySQL->MySQL

Supported

Supported

Supported

To the cloud

MySQL -> GaussDB(for MySQL) primary/standby

Supported

Supported

Supported

To the cloud

MongoDB->DDS

Supported

Supported

Supported

From the cloud

MySQL->MySQL

Supported

Supported

Supported

From the cloud

DDS->MongoDB

Supported

Supported

Supported

Self-built -> Self-built

MySQL->MySQL

Not supported

Supported

Supported

Migration Objects

DRS allows you to migrate objects at different levels. The following table lists the supported migration objects.

Table 6 Supported migration objects

Migration Direction

Data Flow

Full Migration

Table-Level Migration

Database-Level Migration

To the cloud

MySQL->MySQL

Supported

Supported

Supported

To the cloud

MySQL -> GaussDB(for MySQL) primary/standby

Supported

Supported

Supported

To the cloud

MongoDB->DDS

Supported

Supported

Supported

From the cloud

MySQL->MySQL

Supported

Supported

Supported

From the cloud

DDS->MongoDB

Supported

Supported

Supported

Self-built -> Self-built

MySQL->MySQL

Supported

Supported

Supported

Advanced Features

DRS supports multiple features to ensure successful real-time migration.

Table 7 Advanced features

Feature

Description

Flow control

Allows you to limit the overall migration speed to make the impact of migration on bandwidth and database I/O controllable.

Flow control mode takes effect only during a full migration.

Account migration

Allows you to migrate accounts, permissions, and passwords.

Parameter comparison

Checks the consistency of common parameters and performance parameters between source and destination databases to ensure that the migrated service is running properly.

last updated: 2024-11-13 14:24 UTC - commit: 8c5380c714672ae0c0c70e447b4a9ba277419dd9