Docs

Database Transmission Service

Data synchronization

Adjusting the full synchronization rate

You can adjust the full synchronization rate during the data synchronization process based on business data pressure. This topic introduces how to adjust the full synchronization rate on the DTS console.

Prerequisites

A full synchronization task has been created and configured, in which,

If the synchronous topology selected when creating the task is Unidirectional synchronization, you can only adjust the full synchronization rate of the forward synchronization task. For how to configure a synchronization task, refer to Configuring forward synchronization.

If the synchronous topology selected when creating the task is Bidirectional synchronization, you can adjust the full synchronization rate of forward and reverse synchronization tasks separately. For how to configure a reverse task, refer to Configuring reverse synchronization.

Limits

The full synchronization rate can only be adjusted when the synchronization has progressed to full synchronization. For methods of viewing synchronization progress, refer to Viewing synchronization progress.

If the synchronization rate is too high, it may affect the performance of the source database. You can appropriately adjust the synchronization rate based on the read and write pressure of the source and target databases.

Only tasks with instance types of RDS for MySQL, Document Database for MongoDB, and RDS for PostgreSQL support setting the full synchronization rate.

Procedure

3. In the left navigation bar, click Data synchronization.

Find the target synchronization task on the synchronization task list page, and select More operations > Task details to the right of task progress.

On the data synchronization page, click the Monitor tab.

On the Monitor tab, click Adjust full synchronization rate.

In the pop-up dialog box, set the following parameters.

Name	Description
Rows synchronized per second	Enable and set the rows synchronized per second as needed to prevent excessive synchronization speed from affecting the performance of the source database. You can adjust the rows based on the read and write pressure of the source and target databases. The default value is 100000, and the value range is 1-100000.
Data synchronization volume per second	Enable and set the data volume synchronized per second (Unit: KB) as needed to prevent excessive synchronization speed from affecting the performance of the source database. You can adjust the data volume based on the read and write pressure of the source and target databases. The default value is 25,000, and the value range is 1 to 25,000.
Synchronization task concurrency	Set the concurrency of the synchronization task as needed. This concurrency can improve the performance and efficiency of the synchronization task, ensuring it completes quickly and stably. The default value is 8, and the valid range is 1 to 64.

tip

An excessively high synchronization rate may affect the performance of the source database. Adjust appropriately based on the read and write pressure of the source and target databases.

Click OK.

Last updated: 2026.05.06 16:27:36