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        • Checking Whether the Destination Database Has a Read Replica - Data Replication Service

          Checking Whether the Destination Database Has a Read Replica - Data Replication Service

          Handling suggestion: Delete the read replicas from the destination database. After the migration is complete, create read replicas. Parent topic: Destination DB Instance Statuses

          Help > Data Replication Service > Troubleshooting > Solutions to Failed Check Items > Destination DB Instance Statuses
        • Deleting a Subscription Task - Data Replication Service

          Deleting a Subscription Task - Data Replication Service

          Deleting a Task In the task list on the Data Subscription Management page, locate the target task and click Delete in the Operation column. Click Yes to submit the deletion task.

          Help > Data Replication Service > Data Subscription > Task Management
        • Checking Whether the Destination Database Is Involved in Another Migration Task - Data Replication Service

          Checking Whether the Destination Database Is Involved in Another Migration Task - Data Replication Service

          You can also stop or delete an unused migration task. Parent topic: Destination DB Instance Statuses

          Help > Data Replication Service > Troubleshooting > Solutions to Failed Check Items > Destination DB Instance Statuses
        • Whether Foreign Keys Are Disabled or Tables to Be Synchronized Have Foreign Keys in the Destination Database - Data Replication Service

          Whether Foreign Keys Are Disabled or Tables to Be Synchronized Have Foreign Keys in the Destination Database - Data Replication Service

          Handling suggestion: Delete the foreign key, disable the trigger, or change the value of session_replication_role to replica. Parent topic: Database Parameters

          Help > Data Replication Service > Troubleshooting > Solutions to Failed Check Items > Database Parameters
        • Incremental Phase Error: Table *** already exists - Data Replication Service

          Incremental Phase Error: Table *** already exists - Data Replication Service

          Solution Contact destination database O&M engineers to delete the corresponding table from the destination database. In the task list, locate the target task and click Resume in the Operation column to resume the task.

          Help > Data Replication Service > Troubleshooting > Failure Cases > Real-Time Migration and Synchronization from MySQL to MySQL
        • What Are the Impacts on DRS If I Perform Operations on the Destination Database During Data Migration? - Data Replication Service

          What Are the Impacts on DRS If I Perform Operations on the Destination Database During Data Migration? - Data Replication Service

          If you manually add, modify, or delete a record, the DRS data comparison result will be inconsistent. If you scale up storage of a RDS database, it is an internal operation of RDS and does not affect DRS tasks. Parent topic: Product Consulting

          Help > Data Replication Service > FAQs > Product Consulting
        • Full Phase Error: Failed to add the foreign key constraint '***' to system tables - Data Replication Service

          Full Phase Error: Failed to add the foreign key constraint '***' to system tables - Data Replication Service

          Solution Run the following SQL statement to delete or rename the foreign key constraints with the same name in the destination database: select * from information_schema.REFERENTIAL_CONSTRAINTS where CONSTRAINT_NAME = "foreign_key_name"; In the task list, locate the target task and

          Help > Data Replication Service > Troubleshooting > Failure Cases > Real-Time Migration and Synchronization from MySQL to MySQL
        • Incremental Phase Error: Operation not allowed when innodb_force_recovery > 0 - Data Replication Service

          Incremental Phase Error: Operation not allowed when innodb_force_recovery > 0 - Data Replication Service

          When the system variable innodb_force_recovery is set to be greater than 0 in the destination database, the INSERT, UPDATE, and DELETE operations are disabled in the destination database.

          Help > Data Replication Service > Troubleshooting > Failure Cases > Real-Time Migration and Synchronization from MySQL to MySQL
        • What Should I Do If the Last Backup File Is Incorrectly Selected in the Backup Migration Scenario? - Data Replication Service

          What Should I Do If the Last Backup File Is Incorrectly Selected in the Backup Migration Scenario? - Data Replication Service

          In this case, you can only delete the backup database and perform full and incremental backup restoration again. SQL Server does not have the last backup file in a strict sense. If you select No by mistake, you can perform an incremental backup (even if no data is changed).

          Help > Data Replication Service > FAQs > Backup Migration
        • Checking Whether the Same View Names Exist in Both the Source and Destination Databases - Data Replication Service

          Checking Whether the Same View Names Exist in Both the Source and Destination Databases - Data Replication Service

          Handling suggestions: Delete the destination database views that have the same names as those in the source database. Alternatively, do not migrate the views with the same names. Parent topic: Conflicts

          Help > Data Replication Service > Troubleshooting > Solutions to Failed Check Items > Conflicts
        • Preparations - Data Replication Service

          Preparations - Data Replication Service

          Statement for granting the DML permission on all tables in the schema: GRANT SELECT, UPDATE, INSERT, DELETE, INDEX, ALTER ON ALL TABLES IN SCHEMA <schema> TO <user> Statement for granting the DML permission on a specified table in the schema: GRANT SELECT, UPDATE, INSERT, DELETE,

          Help > Data Replication Service > Best Practices > Real-Time Synchronization > From On-premises Oracle to GaussDB Centralized
        • Checking Whether the Source Database Contains Unsupported Generated Columns - Data Replication Service

          Checking Whether the Source Database Contains Unsupported Generated Columns - Data Replication Service

          Return to the object selection page, delete the tables where a generated column is a primary key or unique key from the synchronization object, and perform the pre-check again. Parent topic: Database Parameters

          Help > Data Replication Service > Troubleshooting > Solutions to Failed Check Items > Database Parameters
        • Full Phase Error: Table *** already exists - Data Replication Service

          Full Phase Error: Table *** already exists - Data Replication Service

          Solution Contact the O&M engineers to delete the tables that do not have primary keys from the destination database. In the task list, locate the target task and click Resume in the Operation column to resume the task.

          Help > Data Replication Service > Troubleshooting > Failure Cases > Real-Time Migration and Synchronization from MySQL to MySQL
        • Data Subscription - Data Replication Service

          Data Subscription - Data Replication Service

          Table 1 Advanced features Feature Description Dynamically adding or deleting subscription objects During data subscription, you add or delete subscription objects as required. Viewing subscription data View the incremental data on the management console.

          Help > Data Replication Service > Service Overview > Functions and Features
        • Cost Optimization - Data Replication Service

          Cost Optimization - Data Replication Service

          Resource rightsizing View DRS task monitoring metrics on the Cloud Eye console, restore failed tasks, and delete idle tasks in a timely manner. Purchase a task with the small specifications for workloads requiring low performance stability to reduce costs.

          Help > Data Replication Service > Billing > Cost Management
        • Checking the Length of the Index Column in the Source Database - Data Replication Service

          Checking the Length of the Index Column in the Source Database - Data Replication Service

          Handling suggestion: Do not synchronize indexes or delete some indexes so that the number of indexes in a single table in the source database does not exceed 64.

          Help > Data Replication Service > Troubleshooting > Solutions to Failed Check Items > Database Parameters
        • Which PostgreSQL Permissions Are Required for DRS? - Data Replication Service

          Which PostgreSQL Permissions Are Required for DRS? - Data Replication Service

          after the migration) Reference statements: GRANT CONNECT ON DATABASE database_name TO ptd; GRANT USAGE ON SCHEMA schema_name TO ptd; GRANT SELECT ON TABLE table_name TO ptd; GRANT SELECT ON SEQUENCE sequence_name TO ptd; GRANT SELECT ON pg_catalog.pg_authid TO ptd; GRANT UPDATE, DELETE

          Help > Data Replication Service > FAQs > Permissions Management
        • Incremental Synchronization Error: Source supplemental log level is PK/UI. Missing column data at delete+insert on ***" - Data Replication Service

          Incremental Synchronization Error: Source supplemental log level is PK/UI. Missing column data at delete+insert on ***" - Data Replication Service

          DRS converts the update operation to delete and insert operations by default. During the insert operation, the log does not contain data of other columns. As a result, an error is reported. Solution Change the supplemental log level of the source database to ALL.

          Help > Data Replication Service > Troubleshooting > Failure Cases > Real-Time Synchronization with Oracle Serving as the Source
        • Which Database Accounts Are Required During Migration? - Data Replication Service

          Which Database Accounts Are Required During Migration? - Data Replication Service

          Attempting to delete, rename, or change the passwords or permissions for these accounts will cause task errors.

          Help > Data Replication Service > FAQs > Network and Security
        • Checking Whether There Are Foreign Keys that Are Not Disabled in the Destination Database Table - Data Replication Service

          Checking Whether There Are Foreign Keys that Are Not Disabled in the Destination Database Table - Data Replication Service

          Disable or delete foreign keys. Disabling foreign keys: alter table table_name disable constraint constraint_name; Deleting foreign keys: alter table table_name drop constraint constraint_name; Parent topic: Destination DB Instance Statuses

          Help > Data Replication Service > Troubleshooting > Solutions to Failed Check Items > Destination DB Instance Statuses
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