Scheduling is an advanced feature of data migration. You can configure a scheduling policy and scheduling cycle when you migrate schemas and historical data from the source database to the destination database on a regular basis. The scheduling feature allows you to flexibly build data warehouses. For example, you can build a T+1 data warehouse. This topic describes the scheduling policies of regular data migration, the limits on scheduling policies, and the scenarios of these policies.
All databases that support full data migration support the scheduling feature. For more information, see Database and migration types.
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|Migration type||Instance configuration||Internet traffic|
|Schema migration and full data migration||Free of charge.||Charged only when data is migrated from Alibaba Cloud over the Internet. For more information, see Pricing.|
You can configure a scheduling policy for a regular data migration task in the Configure Migration Types and Objects step.
|Multi-replica mode||DTS migrates schemas and historical data of the required objects from the source database
to the destination database based on the scheduling cycle.
|This policy is applicable to test scenarios where test operations are performed on multiple replicas of historical data.|
|Resynchronization mode||At the first scheduled time, DTS migrates schemas and historical data of the required
objects to the destination database. At each subsequent scheduled time, DTS migrates
schemas and historical data of the required objects to the destination database again.
Warning Before each scheduled time, you must delete schemas and historical data that was migrated to the destination database at the last scheduled time. Otherwise, the data migration fails.
|This policy is applicable to scenarios where only the latest historical data is maintained in the destination database for testing or data analysis.|
|Timestamp-based full data mode||DTS migrates incremental data that is generated after the previous scheduling to the
destination database based on the specified timestamp. This policy has the following
|This policy is applicable to lightweight data migration scenarios where you do not need to migrate all historical data each time. For example, you can use this policy when you build a T+1 data warehouse.|