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Real-Time Disaster Recovery

Updated on 2025-02-17 GMT+08:00

Precautions

The performance indicators provided in this section are for reference only. The actual environment is affected by factors such as the performance of the source or destination database, network bandwidth, data model, and service model.

Specification Description

Based on the performance of data flow types, there are four types of specifications: micro, small, medium, and large. Table 1 lists the performance upper limit of each specification.

Table 1 Performance upper limit

Specifications

Reference Values of Maximum Performance (Rows/Second)

Micro

300

Small

3000

Medium

7500

Large

10000

NOTE:
  • The performance of each specification is affected by factors such as the networks, service and DR database performance, and latency. The values in the table are for reference only.
  • DRS provides specifications of different performance which is measured by DR initialization (no flow control) and DR performance.
  • The maximum performance (row/second) is measured by the number of transactions synchronized per second. The statement types include BEGIN, COMMIT, DML (INSERT, DELETE, and UPDATE), and DDL. You can view the destination database write frequency (apply_rows_rate) monitoring metric on Cloud Eye.
  • DRS allows you to upgrade specifications only for DR tasks from MySQL to MySQL, MySQL to TaurusDB, and TaurusDB to TaurusDB. Task specifications cannot be downgraded. For details, see Changing Specifications.
  • If you want to compare values for a DRS task, select large specifications when creating the DRS task.

Multiple Specifications

DRS real-time DR allows you to select specifications for some specified data flow tasks.

Table 2 Data types that support multiple specifications

DR Direction

Data Flow

Multiple Specifications

Specification Upgrade

Current cloud as standby

MySQL->MySQL

Supported

Yes

Current cloud as active

MySQL->MySQL

Supported

Yes

Current cloud as standby

MySQL->TaurusDB

Supported

Yes

Current cloud as standby

DDM -> DDM

Unsupported

No

Current cloud as active

DDM -> DDM

Unsupported

No

Current cloud as standby

TaurusDB->TaurusDB

Supported

Yes

Current cloud as active

TaurusDB->TaurusDB

Supported

Yes

Dual-active DR

MySQL->MySQL

Supported

Yes

Dual-active DR

TaurusDB->TaurusDB

Supported

No

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