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    Data Transmission Service:Upgrade from one-way to two-way synchronization

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    Data Transmission Service:Upgrade from one-way to two-way synchronization

    Last Updated:Jun 10, 2026

    Upgrade the synchronization topology of a DTS data synchronization task from one-way to two-way in the DTS console.

    Prerequisites

    • Both the source and destination instances are MySQL databases.

    • The task topology is One-way Synchronization.

    • The task status is Running.

    Limitations

    • This upgrade is irreversible. You cannot downgrade from two-way back to one-way synchronization.

    • The upgrade causes approximately 5 seconds of synchronization delay. Perform this operation during off-peak hours.

    • To prevent circular synchronization, DTS creates a database named dts in the destination instance. Ensure that the account used for the task has read and write permissions on this dts database.

    Billing

    • Subscription instances

      Upgrade fee = (Daily price of the instance after the upgrade - Daily price of the instance before the upgrade) × Remaining days until the subscription expires.

      Note

      The remaining subscription days determine the daily rate:

      • If fewer than 300 days remain, the monthly subscription rate applies.

      • If 300 or more days remain, the annual subscription rate applies.

    • Pay-as-you-go instances

      Billing remains unchanged. You are charged hourly based on the current instance configuration.

    Pricing is detailed in the Billing overview.

    Procedure

    1. Go to the data synchronization task list page in the destination region. You can do this in one of two ways.

      DTS console

      1. Log on to the DTS console.

      2. In the navigation pane on the left, click Data Synchronization.

      3. In the upper-left corner of the page, select the region where the synchronization instance is located.

      DMS console

      Note

      The actual steps may vary depending on the mode and layout of the DMS console. For more information, see Simple mode console and Customize DMS console layout and style.

      1. Log on to the DMS console.

      2. In the top menu bar, choose Data + AI > DTS (DTS) > Data Synchronization.

      3. To the right of Data Synchronization Tasks, select the region of the synchronization instance.

    2. Find the target data synchronization task.

    3. In the Actions column of the task, choose > Change to Two-way.

    4. Click OK.

    5. Configure the reverse task.