This topic describes how to view and modify the synchronization objects of a data synchronization task in OceanBase Migration Service (OMS).
Background
If the limits are met, you can add or remove synchronization objects during synchronization. The changes made during the running of the task will be recorded. After an object addition task is completed, it will be integrated with the original task that is associated. After the task is integrated with the original task, the original task runs normally and the object addition task is automatically released.
Limitations
For a data synchronization task in the Not Started, Running, or Paused state, you can add or remove its synchronization objects.
For a data synchronization task in the Failed state, you can only remove its synchronization objects.
For a data synchronization task in the Modifying or Integrating state, you cannot modify its synchronization objects again.
When the Incremental Synchronization step of a data synchronization task is in the Paused or Failed state, you can only remove its synchronization objects.
When you synchronize data from an IDB logical table to a MySQL-compatible tenant of OceanBase Database or to a DataHub instance, you can only add synchronization objects.
View synchronization objects
Log in to the OMS console.
In the left-side navigation pane, click Data Synchronization.
On the Data Synchronization page, click the name of the target task to go to its details page.
Click View Objects in the upper-right corner and view information on the Synchronization Objects and Object Modifications tabs.
The Synchronization Objects tab displays the synchronization objects of the current task. You can click Modify Object and then select Add Object or Remove Objects.
The Object Modifications tab displays the IDs, types, statuses, and occurrence time of all object modifications.
Add synchronization objects
On the details page of the target task, click View Objects in the upper-right corner.
In the View Objects dialog box, choose Modify Objects > Add Objects.
In the Add Objects dialog box that appears, select the objects to be synchronized in the left-side pane and click >. In the Map Object to Topic dialog box that appears, select a mapping method.
After you select the synchronization objects to add, you can perform operations such as changing the topic and setting row filters.
Notice
By default, the newly added synchronization objects will inherit all configuration options of the original data synchronization task. If you abort the object addition operation, you must manually delete the objects that have been added to the target database.
Then, click Next.
The system automatically performs a precheck on the added migration objects. After the added migration objects pass all check items, click Save.
Confirm the information and click OK in the dialog box that appears.
For a paused or failed data migration task, you can cancel the operation and modify the migration objects again. The added migration objects will be migrated to the target database only after the data migration task returns to normal.
If you add synchronization objects for a running data synchronization task, after you click Save, the added synchronization objects will be immediately synchronized to the target database.
After the object addition operation begins, records will be generated on the page that appears after you choose View Objects > Object Modifications. You can view details of the records on this page. The status of object addition records can be Pending, Canceled, Modifying, Running, Aborted, Integrating, Succeeded, or Failed. The operations that you can perform on an object addition record and the status of the original task vary with the status of the object addition record.
Description
If the original data synchronization task is in the Not Started state, a modification record in the Successful state will be generated for an object addition operation. If the original data synchronization task is in the Paused state, a modification record in the Pending state will be generated for an object addition operation.
The status of an object addition record changes only when the original data synchronization task is in the Running state, and the status of the original task changes along with the status of the object addition record. The following table describes more information.
Status of an object addition recordSupported operationsStatus of the original taskPending View details and cancel. Running Canceled None Running Modifying None Modifying Running View details and abort. Modifying Aborted View details. Running Integrating View details. Integrating Succeeded View details. Running Failed View details and retry.
You can also click View Cause to go to the details page of the task and view the cause of the failure.Modifying/Integrating
Remove synchronization objects
On the details page of the target task, click View Objects in the upper-right corner.
In the View Objects dialog box, choose Modify Objects > Remove Objects.
In the Remove Objects dialog box, move the pointer over a migration object that you want to remove in the Target Object section on the right and click Remove.
You can select multiple synchronization objects and then click Batch Remove. In the dialog box that appears, click OK.
In the Remove Objects dialog box, click Remove.
In the confirmation dialog box that appears, confirm the migration object to remove and click OK.
If the task is in the paused, failed, or running state, after you click OK, the migration object is immediately removed from the target database.
Notice
A removed migration object cannot be recovered, so proceed with caution.
The final result of the object removal operation is either succeeded or failed for all migration objects.
After the object removal operation begins, records will be generated on the page displayed after you choose View Objects > Object Modifications. You can view the details of the records on this page. The status of object removal records can be Pending, Canceled, Modifying, Succeeded, or Failed. The operations that you can perform on an object removal record and the status of the original task vary with the status of the object removal record.
Status of an object removal recordSupported operationsStatus of the original taskPending View details and cancel. Running Canceled None Running Modifying None Modifying Succeeded View details. Running Failed View details and retry.
You can also click View Cause to go to the details page of the task and view the cause of the failure.Modifying