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    Data Transmission Service:Modify the number of DUs for a task in a DTS dedicated cluster

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    Data Transmission Service:Modify the number of DUs for a task in a DTS dedicated cluster

    Last Updated:Jul 17, 2026

    The performance of a Data Transmission Service (DTS) dedicated cluster task depends on its number of DUs. You can increase DUs to improve task performance when the current specifications are insufficient.

    Prerequisites

    Usage notes

    Modifying the number of DUs for a DTS dedicated cluster task causes an automatic restart. We recommend that you perform this operation during off-peak hours. If data in the source database changes during the restart, the following issues may occur:

    • Data synchronization task: Data may become inconsistent between the source and destination databases.

    • Data migration task: Data may become inconsistent between the source and destination databases.

    • Change tracking task: The task may fail to capture incremental data.

    After the task restarts and processes the incremental data, data consistency is restored for data synchronization and migration tasks. Change tracking tasks can then retrieve any incremental data generated during the restart.

    Procedure

    1. Go to the Dedicated Cluster page.

    2. Find the task for which you want to modify the number of DUs.

      1. In the top navigation bar, select the region in which the DTS dedicated cluster resides.

      2. In the Cluster Task list, click the name of the target dedicated cluster.

      3. In the left-side navigation pane, click Cluster Task List.

      4. Click the drop-down list to filter tasks.

      5. In the filtered task list, find the task for which you want to modify the number of DUs.

    3. In the Actions column for the target task, click > Change DU.

    4. In the New Instance Class section, modify the number of DUs.

      Note

      For more information about how DUs relate to task performance, see Specifications of dedicated cluster tasks.

    5. Read and select the Data Transmission Service (Pay-as-you-go) Service Terms checkbox.

    6. Click OK.

      The dedicated cluster task restarts immediately. The change takes effect after the task returns to a running state.