Data Replication Service (DRS)

Data Replication Service (DRS) is a stable, efficient, and easy-to-use cloud service for database online migration and synchronization. It simplifies data migration processes and reduces migration costs. You can use DRS to quickly transmit data between databases in various scenarios.

Reasons for DRS in Open Telekom Cloud

Easy to Use

Traditional migration requires professional technical personnel and migration procedures are complicated. DRS simplifies these procedures, so you can migrate databases with ease using our user-friendly UI.

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Fast Setup

DRS sets up a migration task within minutes. Traditional migration takes several days, weeks, or even months to set up.

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Low Costs

DRS saves traditional database administrator (DBA) labor costs and hardware costs.

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Secure

DRS allows you to query the migration progress, check migration logs, and compare migration items, so you can easily complete migration and synchronization tasks.

Key Features of DRS

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Migration, data export and support of DDL and SSL

With the DRS, a smooth migration is guaranteed. Your source databases remain operational and are supported by Data Definition Language (DDL) statements while security is ensured by Secure Sockets Layer (SSL).

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Smooth Migration

Supports migration with minimal downtime. Source databases remain operational during a migration.

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Excellent Performance

Parallel data export and import accelerates the data migration process.

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Support for DDL

Supports DDL statements on the source database during a migration.

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Reliable

Supports SSL to ensure the security of data transmission on a public network.

Online Migration and Data Synchronization

Online Migration

Data Replication Service allows you to migrate data from the source database to the destination database when the DRS instance can connect to both the source and destination databases. In addition, the source DB instances, destination DB instances, and migration objects must be configured.

Online migration supports multiple types of networks, such as public networks, VPCs, VPNs, and direct connections. With these network connections, migration can be performed between different cloud platforms, from on-premises databases to cloud databases, or on cloud databases across regions.

DRS supports incremental migration, which ensures service continuity while minimizing the impact of service downtime and migration. Databases can thereby be smoothly migrated to the cloud, and all database objects can be migrated.

A complete online migration consists of creating a migration task, tracking task progress, analyzing migration logs, and comparing data consistency. By comparing multiple items and data, you can determine the proper time for service migration to minimize the service downtime.

Data Synchronization

Data synchronization refers to the real-time flow of key service data from the source end to the destination end through the DRS instance while consistency of data can be ensured.

It is different from data migration. Migration means moving your overall database from one platform to another. Synchronization refers to the continuous flow of data between different services.

It can be used in many scenarios such as real-time analysis, report system, and data warehouse environment.

Data synchronization focuses on tables and data. It can meet various requirements, such as many-to-one, one-to-many synchronization, dynamic addition and deletion of tables, and synchronization between tables with different names.

Figure 1

Many-to-one data synchronization

A complete online synchronization involves the following procedures.

Figure 1

Synchronization process

Function and features

Important: Data cannot be migrated from a newer version database to an older version database.

Online Migration

Supported Database Types:

Migration Direction	Data Flow	Source DB	Destination DB	Destination DB Type
To the cloud	MySQL->MySQL	On-premises databases Self-built databases on ECSs 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)	On-premises databases Self-built databases on ECSs Databases on other clouds RDS MySQL DB instances	DB instances	Single DB instance
From the cloud	MySQL->MySQL	RDS MySQL DB instances	On-premises databases Self-built databases on ECSs Databases on other clouds	Single DB instance Primary/Standby DB instance
Self-built -> Self-built	MySQL->MySQL	Self-built databases on ECSs On-premises databases	Self-built databases on ECSs On-premises databases	Single DB instance Primary/Standby DB instance

Supported 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
From the cloud	MySQL->MySQL	MySQL 5.6.x MySQL 5.7.x MySQL 8.0.x	MySQL 5.6.x lMySQL 5.7.x MySQL 8.0.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:

Migration Direction	Data Flow	Full Migration	Full+Incremental Migration
To the cloud	MySQL->MySQL	Supported	Supported
From the cloud	MySQL->MySQL	Supported	Supported
Self-built -> Self-built	MySQL->MySQL	Supported	Supported

Migrations Objects:

Migration Direction	Data Flow	Full Migration	Tabel-Level Migration	Database-Level Migration
To the cloud	MySQL->MySQL	Supported	Supported	Supported
From the cloud	MySQL->MySQL	Supported	Supported	Supported
Self-built -> Self-built	MySQL->MySQL	Supported	Supported	Supported

Backup Migration

Supported Database Types:

Data Flow	Backup File Source	Destination DB Type
Microsoft SQL Server -> RDS Microsoft SQL Server	On-premises Microsoft SQL Server backup files RDS Microsoft SQL Server full backup files Microsoft SQL Server backup files on other clouds	RDS Microsoft SQL Server DB instances

Migration Methods:

Data Flow	Full Migration	Incremental Migration
Microsoft SQL Server -> RDS Microsoft SQL Server	Supported	Supported

Supported Database Versions:

Data Flow	Backup File Version	Destination DB Version
Microsoft SQL Server -> RDS Microsoft SQL Server	On-premises and other cloud's Microsoft SQL Server backup file versions: Microsoft SQL Server 2000 Microsoft SQL Server 2005 Microsoft SQL Server 2008 Microsoft SQL Server 2012 Microsoft SQL Server 2014 Microsoft SQL Server 2016 Microsoft SQL Server 2017 Microsoft SQL Server 2019	Microsoft SQL Server 2017 Microsoft SQL Server 2019
	RDS Microsoft SQL Server full backup file versions: Microsoft SQL Server 2008 Microsoft SQL Server 2012 Microsoft SQL Server 2014 Microsoft SQL Server 2016 Microsoft SQL Server 2017 Microsoft SQL Server 2019	Microsoft SQL Server 2017 Microsoft SQL Server 2019

Backup Migration Scenarios:

Scenario	Description
OBS bucket	If you copy the database backup files to an Object Storage Service (OBS) bucket, ensure that the OBS bucket is located in the same region as the destination instance.
RDS full backup	If you select an RDS full backup as the backup file source, ensure that the RDS instance has a full backup.

Data Synchronization

Supported Database Types

Synchronisations- richtung	Datenfluss	Datenbank Quelle	Datenbank Ziel	Datenbanktyp Ziel
Synchronization 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) primary/standby	Primary/Standby DB instance
To the cloud	PostgreSQL->PostgreSQL	On-premises databases Databases on an ECS Databases on other clouds RDS PostgreSQL DB instances	RDS PostgreSQL DB instances	Single DB instance Primary/Standby DB instance
To the cloud	Oracle->PostgreSQL	On-premises databases ECS databases	RDS PostgreSQL DB instances	Single DB instance Primary/Standby DB instance
From the cloud	MySQL->MySQL	RDS MySQL DB instances	On-premises databases ECS databases Databases on other clouds RDS MySQL DB instances	_____
From the cloud	MySQL->Kafka	RDS MySQL DB instances	Kafka	Cluster Single node
Self-built -> Self-built	MySQL->MySQL	On-premises databases ECS databases	On-premises databases ECS databases	Single DB instance Primary/Standby DB instance
Self-built -> Self-built	MySQL->Kafka	On-premises databases ECS databases	Kafka	Cluster Single node

Synchronization Methods

Synchronization Direction	Data Flow	Incremental	Full	Full+Incremental	One-way sync/Two-way sync
To the cloud	MySQL->MySQL	Supported	Not supported	Supported	One-way sync
To the cloud	MySQL -> GaussDB(for MySQL) primary/standby	Supported	Not supported	Supported	One-way sync
To the cloud	PostgreSQL-> PostgreSQL	Supported	Supported	Supported	One-way sync
To the cloud	Oracle->PostgreSQL	Not supported	Supported	Supported	One-way sync
From the cloud	MySQL->MySQL	Supported	Not supported	Supported	One-way sync
From the cloud	MySQL->Kafka	Supported	Not supported	Not supported	One-way sync
Self-built -> Self-built	MySQL->MySQL	Supported	Not supported	Supported	One-way sync
Self-built -> Self-built	MySQL->Kafka	Supported	Not supported	Not supported	One-way sync

Database Versions

Synchronization Direction	Data Flow	Source Database 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	MySQL -> GaussDB(for MySQL) primary/standby	MySQL 5.5.x MySQL 5.6.x MySQL 5.7.x MySQL 8.0.x	GaussDB(for MySQL)-MySQL 8.0
To the cloud	PostgreSQL->PostgreSQL	PostgreSQL 9.4.x PostgreSQL 9.5.x PostgreSQL 9.6.x PostgreSQL 10.x PostgreSQL 11.x PostgreSQL 12.x PostgreSQL 13.x	PostgreSQL 9.5.x PostgreSQL 9.6.x PostgreSQL 10.x PostgreSQL 11.x PostgreSQL 12.x PostgreSQL 13.x
To the cloud	Oracle->PostgreSQL	Oracle 10g Oracle 11g Oracle 12c Oracle 18C Oracle 19C	PostgreSQL 9.5.x PostgreSQL 9.6.x PostgreSQL 10.x PostgreSQL 11.x PostgreSQL 12.x
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	MySQL->Kafka	MySQL 5.6.x MySQL 5.7.x	Kafka 0.11 or later
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
Self-built -> Self-built	MySQL->Kafka	MySQL 5.5.x MySQL 5.6.x MySQL 5.7.x MySQL 8.0.x	Kafka 0.11 or later

Supported Synchronization Objects:

Synchronization Direction	Data Flow	Table-level	Database-level
To the cloud	MySQL->MySQL	Supported	Supported
To the cloud	PostgreSQL->PostgreSQL	Supported	Supported
From the cloud	MySQL->MySQL	Supported	Supported
Self-built -> Self-built	MySQL->MySQL	Supported	Supported

Multi-Active Disaster Recovery

Database Types

DR Direction	Data Flow	Service Database	DR Database	DR DB Instance Type
Current cloud as standby	MySQL->MySQL	On-premises databases Databases on an ECS Databases on other clouds RDS MySQL instances	RDS MySQL instances	Single DB instance Primary/Standby DB instance
Current cloud as active	MySQL->MySQL	RDS MySQL instances	On-premises databases ECS databases Databases on other clouds RDS MySQL instances	Single DB instances Primary/Standby DB instance
Current cloud as standby	MySQL -> GaussDB(for MySQL) primary/standby	On-premises databases ECS databases Databases on other clouds RDS MySQL instances	GaussDB(for MySQL) primary/standby instances	Primary/Standby DB instance
Current cloud as standby	Cassandra->Cassandra	On-premises databases ECS databases Databases on other clouds GaussDB(for Cassandra) instances	GaussDB(for Cassandra) instances	Cluster
Current cloud as active	Cassandra->Cassandra	GaussDB(for Cassandra)	On-premises databases ECS databases Databases on other clouds GaussDB(for Cassandra) instances	Cluster

Database Versions

DR Direction	Data Flow	Service Database Version	DR Database Version
Current cloud as standby	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
Current cloud as active	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
Current cloud as standby	MySQL -> GaussDB(for MySQL) primary/standby	MySQL 5.6.x MySQL 5.7.x	GaussDB(for MySQL)-MySQL 8.0
Current cloud as standby	Cassandra-> Cassandra	Cassandra 2.x	GaussDB(for Cassandra) 3.x
Current cloud as active	Cassandra-> Cassandra	GaussDB(for Cassandra) 3.x	Cassandra 2.x

Supported network types:

DR Direction	Data Flow	VPC	Public Network	VPN or Direct Connect
Current cloud as standby	MySQL->MySQL	Not supported	Supported	Supported
Current cloud as active	MySQL->MySQL	Not supported	Supported	Supported
Current cloud as standby	MySQL -> GaussDB(for MySQL) primary/standby	Not supported	Supported	Supported
Current cloud as standby	Cassandra-> Cassandra	Not supported	Supported	Supported
Current cloud as active	Cassandra-> Cassandra	Not supported	Supported	Supported

Use Cases

Data Replication Service supports online migration in the following scenarios:

Application Scenarios	Description
Migrating on-premises databases to clouds	You can migrate on-premises databases to the cloud with minimum downtime, reducing the impact of migration on your services
Migrating databases between across cloud platforms	You can migrate databases across cloud platforms. You do not need to manually import or export data. DRS helps you quickly migrate databases with minimal downtime.
Migrating databases in VPCs	You can migrate self-built databases on the ECS to the databases on the current cloud, or migrate between databases on the cloud.
Migrating database out of the cloud	You can migrate data from your cloud databases to an external server.

New Features

07/31/2024Data Replication Service supports now DDM into DDMView Details

11/20/2024DRS supports now Real-Time Synchronization View Details

11/20/2024DRS supports now Migrating Data from RDS View Details

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