Data Transmission Service (DTS) provides an easy-to-use data migration feature. To configure a data migration task, you only need to perform simple operations in the DTS console.
This topic provides a general procedure for configuring a data migration task. The procedure varies with the source and destination databases.
Before you begin
- If the source or destination database is a self-managed database, you must deploy the network environment for the database. For more information, see Preparation overview.
- Make sure that the source and destination instances are created and the database versions are supported by DTS.
- Go to the Data Migration page of the new DTS console.
- In the upper-left corner of the page, select the region where the data migration instance
- Click Create Task. On the page that appears, configure the source and destination databases.Warning After you select the source and destination instances, we recommend that you read the limits displayed at the top of the page. This ensures that you can create and run the data migration task.
- In the lower part of the page, click Test Connectivity and Proceed.
- Select objects for the task and configure advanced settings.
- Basic Settings
Parameter Description Task Stages
Select the migration types based on your business requirements. The migration types must be supported by the database engine.
Select one or more objects from the Source Objects section and click the icon to move the objects to the Selected Objects section.
Rename Databases and Tables
Note If you use the object name mapping feature to rename an object, other objects that are dependent on the object may fail to be migrated.
- To rename an object that you want to migrate to the destination instance, right-click the object in the Selected Objects section.
- To rename multiple objects at a time, click in the upper-right corner of the Selected Objects section.
You can specify WHERE conditions to filter data. For more information, see Use SQL conditions to filter data.
Select the SQL operations to be migrated In the Selected Objects section, right-click an object. In the dialog box that appears, select the DML and DDL operations that you want to migrate.
- Advanced Settings
Parameter Description Set AlertsSpecify whether to set alerts for the data migration task. If the task fails or the migration latency exceeds the threshold, the alert contacts will receive notifications.
- Select No if you do not want to set alerts.
- Select Yes to set alerts. In this case, you must also set the alert threshold and alert contacts.
Replicate Temporary Tables When DMS Performs DDL OperationsIf you use Data Management (DMS) to perform online DDL operations on the source database, you can specify whether to migrate temporary tables generated by online DDL operations.
Note This parameter is available only when the source database is a self-managed MySQL database, an ApsaraDB RDS for MySQL instance, or a PolarDB for MySQL cluster.
- Yes: DTS migrates the data of temporary tables generated by online DDL operations.
Note If online DDL operations generate a large amount of data, the migration task may be delayed.
- No: DTS does not migrate the data of temporary tables generated by online DDL operations.
Only the original DDL data of the source database is migrated.
Note If you select No, the tables in the destination database may be locked.
Retry Time for Failed ConnectionsSpecify the retry time for failed connections. Valid values: 10 to 1440. Unit: minutes. Default value: 120. We recommend that you set the retry time to more than 30 minutes. If DTS reconnects to the source and destination databases within the specified time, DTS resumes the data migration task. Otherwise, the data migration task fails.Note
- If multiple DTS instances have the same source or destination database, the lowest value takes effect. For example, the retry time is set to 30 minutes for Instance A and 60 minutes for Instance B, DTS retries failed connections at an interval of 30 minutes.
- When DTS retries a connection, you are charged for the DTS instance. We recommend that you specify the retry time based on your business needs. You can also release the DTS instance at your earliest opportunity after the source and destination instances are released.
- Basic Settings
- In the lower part of the page, click Next: Precheck and Start Task. Note
- Before you can start the data migration task, DTS performs a precheck. You can start the data migration task only after the task passes the precheck.
- If the task fails to pass the precheck, you can click the icon next to each failed item to view details.
- You can troubleshoot the issues based on the causes and run a precheck again.
- If you do not need to troubleshoot the issues, you can ignore failed items and run a precheck again.
- Wait until the Success Rate becomes 100%. Then, click Next: Purchase Instance.
- On the Purchase Instance page, specify the Instance Class parameter for the data migration instance. The following
table describes the parameter.
Section Parameter Description Parameters Instance Class
DTS provides several instance classes that have different performance in migration speed. You can select an instance class based on your business scenario. For more information, see Specifications of data migration instances.
- Read and select Data Transmission Service (Pay-as-you-go) Service Terms.
- Click Buy and Start to start the data migration task. You can view the progress of the task in the task list.