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ApsaraDB RDS:Migrate data from an Amazon RDS for MySQL instance to an ApsaraDB RDS for MySQL instance

Last Updated:Oct 31, 2023

This topic describes how to migrate data from an Amazon RDS for MySQL instance to an ApsaraDB RDS for MySQL instance by using Data Transmission Service (DTS). DTS supports schema migration, full data migration, and incremental data migration. When you configure a data migration task, you can select all of the supported migration types to ensure service continuity.

Prerequisites

  • The Publicly accessible option of the Amazon RDS for MySQL instance is set to Yes. The setting ensures that DTS can access the Amazon RDS for MySQL instance over the Internet.

  • An ApsaraDB RDS for MySQL instance is created. For more information, see Create an ApsaraDB RDS for MySQL instance.

  • The available storage space of the ApsaraDB RDS for MySQL instance is larger than the total size of the data in the Amazon RDS for MySQL instance.

Limits

  • DTS uses read and write resources of the source and destination databases during full data migration. This may increase the loads of the database servers. If the database performance is unfavorable, the specification is low, or the data volume is large, database services may become unavailable. For example, DTS occupies a large amount of read and write resources in the following cases: a large number of slow SQL queries are performed on the source database, the tables have no primary keys, or a deadlock occurs in the destination database. Before you migrate data, evaluate the impact of data migration on the performance of the source and destination databases. We recommend that you migrate data during off-peak hours. For example, you can migrate data when the CPU utilization of the source and destination databases is less than 30%.
  • The tables to be migrated in the source database must have PRIMARY KEY or UNIQUE constraints and all fields must be unique. Otherwise, the destination database may contain duplicate data records.
  • DTS uses the ROUND(COLUMN,PRECISION) function to retrieve values from columns of the FLOAT or DOUBLE data type. If you do not specify a precision, DTS sets the precision for the FLOAT data type to 38 digits and the precision for the DOUBLE data type to 308 digits. You must check whether the precision settings meet your business requirements.
  • DTS automatically creates a destination database in the ApsaraDB RDS for MySQL instance. However, if the name of the source database is invalid, you must manually create a database in the ApsaraDB RDS for MySQL instance before you configure the data migration task.
    Note For more information about the database naming conventions of ApsaraDB RDS for MySQL databases and how to create a database, see Create a database for an ApsaraDB RDS for MySQL instance.
  • If a data migration task fails, DTS automatically resumes the task. Before you switch your workloads to the destination instance, stop or release the data migration task. Otherwise, the data in the source database overwrites the data in the destination instance after the task is resumed.

Billing rules

Migration type

Task configuration fee

Internet traffic fee

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 Billing overview.

Incremental data migration

Charged. For more information, see Billing overview.

Migration types

  • Schema migration

    DTS migrates the schemas of objects to the ApsaraDB RDS for MySQL instance. DTS supports schema migration for the following types of objects: tables, views, triggers, stored procedures, and stored functions. DTS does not support schema migration for events.

    Note
    • During schema migration, DTS changes the value of the SECURITY attribute from DEFINER to INVOKER for views, stored procedures, and stored functions.

    • DTS does not migrate user information. To call a view, stored procedure, or stored function of the destination database, you must grant the read and write permissions to INVOKER.

  • Full data migration

    DTS migrates the existing data of objects from the Amazon RDS for MySQL instance to the ApsaraDB RDS for MySQL instance.

    Note
    • During full data migration, concurrent INSERT operations cause fragmentation in the tables of the destination instance. After full data migration is complete, the size of used tablespace of the destination instance is larger than that of the source instance.

    • During schema migration and full data migration, do not perform DDL operations in the source database. For example, do not add a field. Otherwise, data migration may fail.

  • Incremental data migration

    After full data migration is complete, DTS retrieves binary log files from the Amazon RDS for MySQL instance. Then, DTS synchronizes incremental data from the Amazon RDS for MySQL instance to the ApsaraDB RDS for MySQL instance. Incremental data migration allows you to ensure service continuity when you migrate data between MySQL databases.

Permissions required for database accounts

Database

Schema migration

Full data migration

Incremental data migration

Amazon RDS for MySQL instance

The SELECT permission

The SELECT permission

The REPLICATION SLAVE, REPLICATION CLIENT, SHOW VIEW, and SELECT permissions

ApsaraDB RDS for MySQL instance

The read and write permissions

The read and write permissions

The read and write permissions

For more information about how to create a database account and grant permissions to the database account, see the following topics:

Before you begin

  1. Log on to the Amazon RDS Management Console.

  2. In the left-side navigation pane, click Databases.

  3. Find the Amazon RDS for MySQL instance that you want to manage and click the value in the DB identifier column.

  4. In the Security group rules section, click the name of the security group to which the existing inbound rule belongs.

    安全组规则
  5. On the Security Groups page, click the ID of the security group that you want to configure.

  6. On the Inbound rules tab, click Edit inbound rules.

  7. On the Edit inbound rules page, click Add rule, add the CIDR blocks of DTS servers that reside in the corresponding region to the inbound rule, and then click Save rules. For more information, see Add the CIDR blocks of DTS servers to the security settings of on-premises databases.

    Note
    • You need to add only the CIDR blocks of DTS servers that reside in the same region as the destination database. For example, the source database resides in the Singapore region and the destination database resides in the China (Hangzhou) region. You need to add only the CIDR blocks of DTS servers that reside in the China (Hangzhou) region.

    • You can add all of the required CIDR blocks to the inbound rule at a time.

    • If you have other questions, see the official documentation of Amazon or contact technical support.

  8. Log on to the Amazon RDS for MySQL database and specify the number of hours to retain binary log files. Skip this step if you do not need to perform incremental data migration.

    call mysql.rds_set_configuration('binlog retention hours', 24);
    Note
    • The preceding statement sets the retention period of binary log files to 24 hours. The maximum retention period is 168 hours, which equals seven days.

    • The binary logging feature of the Amazon RDS for MySQL instance must be enabled, and the value of the binlog_format parameter must be set to row. If the MySQL version is 5.6 or later, the value of the binlog_row_image parameter must be set to full. For more information about how to enable the binary logging feature, see the official documentation of Amazon or contact technical support.

Procedure (in the new DTS console)

  1. Go to the Data Migration Tasks page.
    1. Log on to the Data Management (DMS) console.
    2. In the top navigation bar, click DTS.
    3. In the left-side navigation pane, choose DTS (DTS) > Data Migration.
    Note
  2. From the drop-down list next to Data Migration Tasks, select the region in which the data migration instance resides.
    Note If you use the new DTS console, you must select the region in which the data migration instance resides in the upper-left corner.
  3. Click Create Task. In the Create Task wizard, configure the source and destination databases.

    Warning

    After you configure the source and destination databases, we recommend that you read the limits that are displayed in the upper part of the page. Otherwise, the task may fail or data inconsistency may occur.

    Section

    Parameter

    Description

    N/A

    Task Name

    The name of the task. DTS automatically assigns a name to the task. We recommend that you specify a descriptive name that makes it easy to identify the task. You do not need to specify a unique task name.

    Source Database

    Select an existing DMS database instance

    The database instance that you want to use. You can choose whether to select an existing instance based on your business requirements.

    • If you select an existing instance, DTS automatically populates the parameters for the database.

    • If you do not select an existing instance, you must manually configure parameters for the database.

    Database Type

    The type of the source database. Select MySQL.

    Access Method

    The access method of the source database. Select Public IP Address.

    Instance Region

    The region in which the Amazon RDS for MySQL instance resides.

    Note

    If the region in which the Amazon RDS for MySQL instance resides is not displayed in the drop-down list, select a region that is geographically closest to the Amazon RDS for MySQL instance.

    Hostname or IP address

    The endpoint that is used to access the Amazon RDS for MySQL instance.

    Note

    You can obtain the values of the Endpoint and Port parameters on the Connectivity & security tab of the Amazon RDS for MySQL instance.

    Port Number

    The service port number of the Amazon RDS for MySQL instance. Default value: 3306.

    Database Account

    The database account of the Amazon RDS for MySQL instance. For information about the permissions that are required for the account, see the Permissions required for database accounts section of this topic.

    Database Password

    The password of the database account.

    Destination Database

    Select an existing DMS database instance

    The database instance that you want to use. You can choose whether to select an existing instance based on your business requirements.

    • If you select an existing instance, DTS automatically populates the parameters for the database.

    • If you do not select an existing instance, you must manually configure parameters for the database.

    Database Type

    The type of the destination database. Select MySQL.

    Access Method

    The access method of the destination database. Select Alibaba Cloud Instance.

    Instance Region

    The region in which the destination ApsaraDB RDS for MySQL instance resides.

    Replicate Data Across Alibaba Cloud Accounts

    Specifies whether to migrate data across Alibaba Cloud accounts. In this example, No is selected.

    RDS Instance ID

    The ID of the destination ApsaraDB RDS for MySQL instance.

    Database Account

    The database account of the ApsaraDB RDS for MySQL instance. For information about the permissions that are required for the account, see the Permissions required for database accounts section of this topic.

    Database Password

    The password of the database account.

    Encryption

    Specifies whether to encrypt the connection to the source database. You can select Non-encrypted or SSL-encrypted based on your business requirements. If you select SSL-encrypted, you must enable SSL encryption for the ApsaraDB RDS for MySQL instance before you configure the data migration task. For more information, see Configure the SSL encryption feature.

  4. In the lower part of the page, click Test Connectivity and Proceed.
  5. If an IP address whitelist is configured for your self-managed database, add the CIDR blocks of DTS servers to the IP address whitelist. Then, click Test Connectivity and Proceed.

    Warning

    If the public CIDR blocks of DTS servers are automatically or manually added to the IP address whitelist of a database instance or to the security group rules of an ECS instance, security risks may arise. Therefore, before you use DTS to migrate data, you must understand and acknowledge the potential risks and take preventive measures, including but not limited to the following measures: enhancing the security of your account and password, limiting the ports that are exposed, authenticating API calls, regularly checking the IP address whitelist or ECS security group rules and forbidding unauthorized CIDR blocks, and connecting the database to DTS by using Express Connect, VPN Gateway, or Smart Access Gateway.

  6. Configure the objects to be migrated and advanced settings.

    Parameter

    Description

    Migration Types

    • To perform only full data migration, select Schema Migration and Full Data Migration.

    • To ensure service continuity during data migration, select Schema Migration, Full Data Migration, and Incremental Data Migration.

    Note

    If you do not select Incremental Data Migration, we recommend that you do not write data to the source database during data migration. This ensures data consistency between the source and destination databases.

    Processing Mode of Conflicting Tables

    • Precheck and Report Errors: checks whether the destination database contains tables that have the same names as tables in the source database. If the source and destination databases do not contain tables that have identical table names, the precheck is passed. Otherwise, an error is returned during the precheck and the data migration task cannot be started.

      Note

      You can use the object name mapping feature to rename the tables that are migrated to the destination database. You can use this feature if the source and destination databases contain tables that have identical table names and the tables in the destination database cannot be deleted or renamed. For more information, see Map object names.

    • Ignore Errors and Proceed: skips the precheck for identical table names in the source and destination databases.

      Warning

      If you select Ignore Errors and Proceed, data inconsistency may occur and your business may be exposed to the following potential risks:

      • If the source and destination databases have the same schemas, DTS does not migrate data records that have the same primary key values as data records in the destination database.

      • If the source and destination databases have different schemas, only specific columns are migrated or the data migration task fails. Proceed with caution.

    Method to Migrate Triggers in Source Database

    The method used to migrate triggers from the source database. You can select a migration method based on your business requirements. If no triggers are to be migrated, you do not need to configure this parameter. For more information, see Synchronize or migrate triggers from the source database.

    Note

    You can configure this parameter only when you select Schema Migration for the Migration Types parameter.

    Enable Migration Assessment

    Specifies whether to enable migration assessment. Migration assessment aims to check whether the schemas of the source and destination databases, such as the length of indexes, stored procedures, and dependent tables, meet the requirements. You can select Yes or No based on your business requirements.

    Note
    • You can configure this parameter only when you select Schema Migration for the Migration Types parameter.

    • If you select Yes, the precheck may take more time. You can view the assessment results during the precheck. The assessment results do not affect the precheck results.Assessment Result

    Capitalization of Object Names in Destination Instance

    The capitalization of database names, table names, and column names in the destination instance. By default, DTS default policy is selected. You can select other options to make sure that the capitalization of object names is consistent with that in the source or destination database. For more information, see Specify the capitalization of object names in the destination instance.

    Source Objects

    Select one or more objects from the Source Objects section. Click the Rightwards arrow icon and add the objects to the Selected Objects section.

    Note

    You can select columns, tables, or schemas as the objects to be migrated. If you select tables or columns as the objects to be migrated, DTS does not migrate other objects, such as views, triggers, or stored procedures, to the destination database.

    Selected Objects

    • To rename an object that you want to migrate to the destination instance, right-click the object in the Selected Objects section. For more information, see Map the name of a single object.
    • To rename multiple objects at a time, click Batch Edit in the upper-right corner of the Selected Objects section. For more information, see Map multiple object names at a time.
    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 specify WHERE conditions to filter data, right-click a table in the Selected Objects section. In the dialog box that appears, specify the conditions. For more information, see Use SQL conditions to filter data.

    • To select the SQL operations performed on a specific database or table, right-click an object in the Selected Objects section. In the dialog box that appears, select the SQL operations that you want to migrate.

  7. Click Next: Advanced Settings to configure advanced settings.

    • Data Verification Settings

      For more information about how to use the data verification feature, see Enable data verification.

    • Advanced Settings

      Parameter

      Description

      Select the dedicated cluster used to schedule the task

      By default, DTS schedules the data migration task to the shared cluster if you do not specify a dedicated cluster. You can also purchase and specify a dedicated cluster of the required specifications to run the data migration task. For more information, see What is a DTS dedicated cluster.

      Set Alerts

      Specifies whether to configure alerting for the data migration task. If the task fails or the migration latency exceeds the specified threshold, the alert contacts will receive notifications. Valid values:

      • No: does not configure alerting.

      • Yes: configures alerting. If you select Yes, you must also specify the alert threshold and alert contacts. For more information, see Configure monitoring and alerting.

      Copy the temporary table of the Online DDL tool that is generated in the source table to the destination database.

      If you use DMS or the gh-ost tool to perform online DDL operations on the source database, you can specify whether to migrate the data of temporary tables generated by online DDL operations. Valid values:

      Important

      You cannot use tools such as pt-online-schema-change to perform online DDL operations on the source database. Otherwise, the DTS task fails.

      • 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 data migration task may take an extended period of time to complete.

      • No, Adapt to DMS Online DDL: DTS does not migrate the data of temporary tables generated by online DDL operations. Only the original DDL operations that are performed by using DMS are migrated.

        Note

        If you select No, Adapt to DMS Online DDL, the tables in the destination database may be locked.

      • No, Adapt to gh-ost: DTS does not migrate the data of temporary tables generated by online DDL operations. Only the original DDL operations that are performed by using the gh-ost tool are migrated. You can use the default or custom regular expressions to filter out the shadow tables of the gh-ost tool and tables that are not required.

        Note

        If you select No, Adapt to gh-ost, the tables in the destination database may be locked.

      Retry Time for Failed Connections

      The retry time range for failed connections. If the source or destination database fails to be connected after the data migration task is started, DTS immediately retries a connection within the time range. Valid values: 10 to 1440. Unit: minutes. Default value: 720. We recommend that you set the parameter to a value greater than 30. If DTS reconnects to the source and destination databases within the specified time range, DTS resumes the data migration task. Otherwise, the data migration task fails.
      Note
      • If you set different retry time ranges for multiple data migration tasks that have the same source or destination database, the shortest retry time range that is set takes precedence.
      • When DTS retries a connection, you are charged for the DTS instance. We recommend that you specify the retry time range based on your business requirements. You can also release the DTS instance at your earliest opportunity after the source and destination instances are released.

      The wait time before a retry when other issues occur in the source and destination databases.

      The retry time range for other issues. For example, if DDL or DML operations fail to be performed after the data migration task is started, DTS immediately retries the operations within the retry time range. Valid values: 1 to 1440. Unit: minutes. Default value: 10. We recommend that you set the parameter to a value greater than 10. If the failed operations are successfully performed within the specified retry time range, DTS resumes the data migration task. Otherwise, the data migration task fails.

      Important

      The value of the The wait time before a retry when other issues occur in the source and destination databases parameter must be smaller than the value of the Retry Time for Failed Connections parameter.

      Enable Throttling for Full Data Migration

      Specifies whether to enable throttling for full data migration. During full data migration, DTS uses the read and write resources of the source and destination databases. This may increase the loads of the database servers. If you select Yes, you can configure the Queries per second (QPS) to the source database, RPS of Full Data Migration, and Data migration speed for full migration (MB/s) parameters based on your business requirements. This reduces the loads of the destination database server.

      Note

      You can configure this parameter only when you select Full Data Migration for the Migration Types parameter.

      Enable Throttling for Incremental Data Migration

      Specifies whether to enable throttling for incremental data migration. If you select Yes, you can configure the RPS of Incremental Data Migration and Data migration speed for incremental migration (MB/s) parameters based on your business requirements. This reduces the loads of the destination database server.

      Note

      You can configure this parameter only when you select Incremental Data Migration for the Migration Types parameter.

      Environment Tag

      The environment tag that is used to identify the DTS instance. You can select an environment tag based on your business requirements. In this example, you do not need to configure this parameter.

      Configure ETL

      Specifies whether to configure the extract, transform, and load (ETL) feature. For more information, see What is ETL?. Valid values:

      Whether to delete SQL operations on heartbeat tables of forward and reverse tasks

      Specifies whether to write SQL operations on heartbeat tables to the source database while the DTS instance is running.

      • Yes: does not write SQL operations on heartbeat tables. In this case, a latency of the DTS instance may be displayed.

      • No: writes SQL operations on heartbeat tables. In this case, specific features such as physical backup and cloning of the source database may be affected.

  8. In the lower part of the page, click Next: Save Task Settings and Precheck.

    You can move the pointer over Next: Save Task Settings and Precheck and click Preview OpenAPI parameters to view the parameters to be specified when you call the relevant API operation to configure the DTS 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, click View Details next to each failed item. After you troubleshoot the issues based on the error message, you can run a precheck again.

    • If an alert is triggered for an item during the precheck:

      • If the alert item cannot be ignored, click View Details next to the failed item and troubleshoot the issues. Then, run a precheck again.

      • If the alert item can be ignored, click Confirm Alert Details. In the View Details dialog box, click Ignore. In the message that appears, click OK. Then, click Precheck Again to run a precheck again. If you ignore the alert item, data inconsistency may occur and your business may be exposed to potential risks.

  9. Wait until the success rate becomes 100%. Then, click Next: Purchase Instance.

  10. On the Purchase Instance page, configure the Instance Class parameter for the data migration instance. The following table describes the parameters.

    Section

    Parameter

    Description

    New Instance Class

    Resource Group

    The resource group to which the data migration instance belongs. Default value: default resource group. For more information, see What is Resource Management?

    Instance Class

    DTS provides instance classes that vary in the migration speed. You can select an instance class based on your business scenario. For more information, see Specifications of data migration instances.

  11. Read and agree to Data Transmission Service (Pay-as-you-go) Service Terms by selecting the check box.

  12. Click Buy and Start to start the data migration task. You can view the progress of the task in the task list.

Procedure (in the old DTS console)

  1. Log on to the DTS console.
    Note If you are redirected to the Data Management (DMS) console, you can click the old icon in the lower-right corner to go to the previous version of the DTS console.
  2. In the left-side navigation pane, click Data Migration.
  3. At the top of the Migration Tasks page, select the region where the destination cluster resides.
  4. In the upper-right corner of the page, click Create Migration Task.
  5. Configure the source and destination databases.

    源库和目标库连接配置

    Section

    Parameter

    Description

    N/A

    Task Name

    The name of the task. DTS automatically assigns a name to the task. We recommend that you specify a descriptive name that makes it easy to identify the task. You do not need to specify a unique task name.

    Source Database

    Instance Type

    The instance type of the source database. Select User-Created Database with Public IP Address.

    Instance Region

    The region in which the source instance resides. If you select User-Created Database with Public IP Address as the instance type of the source database, you do not need to configure the Instance Region parameter.

    Database Type

    The type of the source database. Select MySQL.

    Hostname or IP Address

    The endpoint that is used to access the Amazon RDS for MySQL instance.

    Note

    You can obtain the endpoint on the basic information page of the Amazon RDS for MySQL instance.

    连接地址

    Port Number

    The service port number of the Amazon RDS for MySQL instance. Default value: 3306.

    Database Account

    The database account of the Amazon RDS for MySQL instance. For information about the permissions that are required for the account, see the Permissions required for database accounts section of this topic.

    Database Password

    The password of the database account.

    Note

    After you configure the source database parameters, click Test Connectivity next to Database Password to verify whether the configured parameters are valid. If the configured parameters are valid, the Passed message is displayed. If the Failed message is displayed, click Check next to Failed to modify the source database parameters based on the check results.

    Destination Database

    Instance Type

    The instance type of the destination database. Select RDS Instance.

    Instance Region

    The region in which the ApsaraDB RDS for MySQL instance resides.

    RDS Instance ID

    The ID of the ApsaraDB RDS for MySQL instance.

    Database Account

    The database account of the ApsaraDB RDS for MySQL instance. For information about the permissions that are required for the account, see the Permissions required for database accounts section of this topic.

    Database Password

    The password of the database account.

    Note

    After you configure the destination database parameters, click Test Connectivity next to Database Password to verify whether the configured parameters are valid. If the configured parameters are valid, the Passed message is displayed. If the Failed message is displayed, click Check next to Failed to modify the destination database parameters based on the check results.

    Encryption

    Specifies whether to encrypt the connection to the destination instance. Select Non-encrypted or SSL-encrypted based on your business and security requirements. If you select SSL-encrypted, you must enable SSL encryption for the ApsaraDB RDS for MySQL instance before you configure the data migration task. For more information, see Configure the SSL encryption feature.

    Note

    The Encryption parameter is displayed only for regions in the Chinese mainland and the China (Hong Kong) region.

  6. In the lower-right corner of the page, click Set Whitelist and Next.

    If the source or destination database instance is an Alibaba Cloud database instance, such as an ApsaraDB RDS for MySQL or ApsaraDB for MongoDB instance, or is a self-managed database hosted on Elastic Compute Service (ECS), DTS automatically adds the CIDR blocks of DTS servers to the whitelist of the database instance or ECS security group rules. If the source or destination database is a self-managed database on data centers or is from other cloud service providers, you must manually add the CIDR blocks of DTS servers to allow DTS to access the database. For more information about the CIDR blocks of DTS servers, see the "CIDR blocks of DTS servers" section of the Add the CIDR blocks of DTS servers to the security settings of on-premises databases topic.

    Warning If the CIDR blocks of DTS servers are automatically or manually added to the whitelist of the database or instance, or to the ECS security group rules, security risks may arise. Therefore, before you use DTS to migrate data, you must understand and acknowledge the potential risks and take preventive measures, including but not limited to the following measures: enhance the security of your username and password, limit the ports that are exposed, authenticate API calls, regularly check the whitelist or ECS security group rules and forbid unauthorized CIDR blocks, or connect the database to DTS by using Express Connect, VPN Gateway, or Smart Access Gateway.
  7. Select the objects to be migrated and the migration types.

    选择迁移对象和类型

    Parameter

    Description

    Migration Types

    • To perform only full data migration, select Schema Migration and Full Data Migration.

    • To ensure service continuity during data migration, select Schema Migration, Full Data Migration, and Incremental Data Migration.

    Note
    • If Incremental Data Migration is not selected, we recommend that you do not write data to the source database during data migration. This ensures data consistency between the source and destination databases.

    • During schema migration and full data migration, we recommend that you do not perform DDL operations on the objects to be migrated. Otherwise, the objects may fail to be migrated.

    Rename Databases and Tables

    You can use the object name mapping feature to rename the objects that are migrated to the destination instance. For more information, see Object name mapping.

    Retry Time for Failed Connection

    By default, if DTS fails to connect to the source or destination database, DTS retries within the next 12 hours. You can specify the retry time range based on your business requirements. If DTS reconnects to the source and destination databases within the specified retry time range, DTS resumes the data migration task. Otherwise, the data migration task fails.

    Note

    When DTS retries a connection, you are charged for the DTS instance. We recommend that you specify the retry time range based on your business requirements. You can also release the DTS instance at the earliest opportunity after the source and destination instances are released.

    Source table DMS_ ONLINE_ Do you want to copy the temporary table to the target database during DDL

    If you use DMS to perform online DDL operations on the source database, you can specify whether to migrate the data of temporary tables generated by online DDL operations. Valid values:

    • Yes: DTS migrates the data of temporary tables generated by online DDL operations.

      Note

      If online DDL operations generate a large amount of data, latency may occur for the data migration task.

    • 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 ApsaraDB RDS for MySQL instance may be locked.

  8. In the lower-right corner of the page, click Precheck.
    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 Info icon 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.
  9. After the task passes the precheck, click Next.
  10. In the Confirm Settings dialog box, specify the Channel Specification parameter and select Data Transmission Service (Pay-As-You-Go) Service Terms.
  11. Click Buy and Start to start the data migration task.
    • Schema migration and full data migration

      We recommend that you do not manually stop the task during full data migration. Otherwise, the data migrated to the destination database may be incomplete. You can wait until the data migration task automatically stops.

    • Schema migration, full data migration, and incremental data migration

      An incremental data migration task does not automatically stop. You must manually stop the task.

      Important We recommend that you select an appropriate time to manually stop the data migration task. For example, you can stop the task during off-peak hours or before you switch your workloads to the destination cluster.
      1. Wait until Incremental Data Migration and The migration task is not delayed appear in the progress bar of the migration task. Then, stop writing data to the source database for a few minutes. The latency of incremental data migration may be displayed in the progress bar.
      2. Wait until the status of incremental data migration changes to The migration task is not delayed again. Then, manually stop the migration task. Stop an incremental data migration task
  12. Switch your workloads to the destination ApsaraDB RDS for MySQL instance.