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    DataWorks:Synchronize all data in a MySQL database to Hologres in real time

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    DataWorks:Synchronize all data in a MySQL database to Hologres in real time

    Last Updated:Nov 14, 2025

    Data Integration supports real-time synchronization of entire databases from data sources such as ApsaraDB for OceanBase, MySQL, Oracle, and PolarDB to Hologres. This topic uses MySQL as the source and Hologres as the destination to describe how to synchronize both full and incremental data from an entire MySQL database to Hologres.

    Prerequisites

    Precautions

    When you synchronize data from MySQL to Hologres, you can write data only to child partitioned tables.

    Procedure

    1. Select a synchronization type

    1. Go to the Data Integration page.

      Log on to the DataWorks console. In the top navigation bar, select the desired region. In the left-side navigation pane, choose Data Integration > Data Integration. On the page that appears, select the desired workspace from the drop-down list and click Go to Data Integration.

    2. In the left-side navigation pane, click Synchronization Task, and then click Create Synchronization Task at the top of the page to go to the synchronization task creation page. Configure the following basic information:

      • Source And Destination: MySQL→Hologres

      • New Node Name: Specify a name for the synchronization task.

      • Synchronization Method: Real-time migration of entire database.

      • Synchronization Mode: Select Full Initialization and Incremental Synchronization.

    2. Configure network and resources

    1. In the Network And Resource Configuration section, select a Resource Group for the synchronization task. You can allocate a number of compute units (CUs) for Task Resource Usage.

    2. Source Select the added MySQL data source, Destination Select the added Hologres data source, and then click Test Connectivity.image

    3. After you make sure that both the source and destination data sources are connected successfully, click Next.

    3. Select the tables from which you want to synchronize data

    In this step, you can select the tables from which you want to synchronize data in the Source Table section and click the image icon to move them to the Selected Tables section on the right.

    image

    • Select Specific Tables:

      • In the Database Filter and Table Filter fields of the source tables, you can filter databases and tables by entering characteristic information of database names or table names. Select all the databases and tables from which you want to synchronize data, and click the image icon to move them to the Selected Tables section.

      • In the Selected Tables section, you can filter databases and tables that you do not want to synchronize by entering characteristic information in the Database Filter and Table Filter fields. Select all the databases and tables that you do not want to synchronize, and click the image icon to move them back to the Source Table section.

    • Use Regular Expression To Select Tables (Support Adding Or Removing Tables By Regular Expression During Runtime):

      Filter tables using regular expressions configured in the Database Filter and Table Filter fields. Click Confirm Selection to select the databases and tables from which you want to synchronize data.

      Note

      For example, if you want to filter and synchronize databases with names that have the prefix a and tables with names that have the prefix order, you can enter in the Database Filtera.*Table Filter field and order.* in the Table Filter field.

    4. Configure settings related to the destination

    After you select the tables from which you want to synchronize data, the selected tables are automatically displayed in the Mapping Rules for Destination Tables section. The properties of the destination tables are waiting to be mapped. You must manually define mappings between the source tables and destination tables to determine the data reading and writing relationships. Then, you can click Refresh in the Actions column. You can directly refresh mappings between source tables and destination tables. You can also refresh mappings between source tables and destination tables after you configure settings related to destination tables.

    Note

    • You can select the tables that you want to synchronize and click Batch Refresh Mapping Results. If no mapping rules are configured, the default table name rule is ${Table name}. If a table with the same name does not exist in the destination, the system automatically creates one.

    • You can click Configure in the Customize Mapping Rules For Destination Schema Names column to customize destination schema name rules.

      You can concatenate built-in variables and manually entered strings into a final Destination Schema Name. You can edit built-in variables. For example, you can create a new schema name rule that adds a suffix to the source database name to form a Destination Schema Name.

    • You can click Edit in the Customize Mapping Rules for Destination Table Names column to configure mapping rules for destination table names based on your business requirements.

      You can concatenate a built-in variable and a specific string into a destination table name. You can edit built-in variables. For example, when you create a mapping rule, you can add a suffix to a variable that indicates a source table name to form a destination table name.

    a. Modify data type mappings for fields

    Default mappings exist between data types of source fields and data types of destination fields. You can click Edit Mapping of Field Data Types in the upper-right corner of the Mapping Rules for Destination Tables section to configure data type mappings between source fields and destination fields based on your business requirements. After the configuration is complete, click Apply and Refresh Mapping.

    b. Modify the schema of a destination table to add fields to the table and assign values to the fields

    If a destination table is in the to-be-created state, you can perform the following steps to add fields to the table and assign values to the fields:

    1. Add fields to one or more destination tables.

      • Add fields to a single destination table: Find the destination table to which you want to add fields and click the image.png icon in the Destination Table Name column. In the dialog box that appears, add fields.

      • Add fields to multiple destination tables at a time: Select the destination tables to which you want to add fields at a time, click Batch Modify in the lower part of the page, and then click Destination Table Schema - Batch Modify and Add Field.

    2. Assign values to the fields. You can perform one of the following operations to assign values to the fields:

      • Assign values to the fields that are added to a single destination table: Find the destination table in which you want to assign values to newly added fields and click Configure in the Value assignment column. In the Additional Field dialog box, assign values to the fields.

      • Assign values to the fields that are added to multiple destination tables at a time: Select the destination tables in which you want to assign values to newly added fields, click Batch Modify in the lower part of the page, and then click Value assignment to assign values to the same fields in the selected destination tables at a time.

      Note

      You can click the image icon to switch the value assignment method and assign constants and variables to the fields that are added to a destination table.

    c. Configure DML processing rules

    Data Integration provides default DML processing rules. You can also configure DML processing rules for destination tables based on your business requirements.

    • Configure DML processing rules for a single destination table: Find the destination table for which you want to configure DML processing rules and click Configure in the Configure DML Rule column to configure DML processing rules for the table.

    • Configure DML processing rules for multiple destination tables at a time: Select the destination tables for which you want to configure DML processing rules, click Batch Modify in the lower part of the page, and then click Configure DML Rule.

    4. Configure advanced parameters

    If you want to make fine-grained configurations to meet your business requirements, you can click Configure in the Custom Advanced Parameters column to modify advanced parameters.

    Important

    Before you modify the configurations of advanced parameters, make sure that you understand the meanings of the parameters to prevent unexpected errors or data quality issues.

    5. Configure source split columns

    You can select a field from the source table in the Source Split Column drop-down list or select No Split.

    6. Specify whether to perform full synchronization

    If you selected Full Initialization for the Synchronization Mode parameter when you selected a synchronization type, you can disable full synchronization for specific tables here.

    5. Configure alert rules

    To prevent the failure of the synchronization task from causing latency on business data synchronization, you can configure different alert rules for the synchronization task.

    1. In the upper-right corner of the page, click Configure Alert Rule to go to the Configure Alert Rule panel.

    2. In the Configure Alert Rule panel, click Add Alert Rule. In the Add Alert Rule dialog box, configure the parameters to configure an alert rule.

      Note

      The alert rules that you configure in this step take effect for the real-time synchronization subtask that will be generated by the synchronization task. After the configuration of the synchronization task is complete, you can refer to Manage real-time synchronization tasks to go to the Real-time Synchronization Task page and modify alert rules configured for the real-time synchronization subtask.

    3. Manage alert rules.

      You can enable or disable alert rules that are created. You can also specify different alert recipients based on the severity levels of alerts.

    6. Configure advanced parameters

    You can change the values of specific parameters configured for the synchronization task based on your business requirements. For example, you can specify an appropriate value for the Maximum read connections parameter to prevent the current synchronization task from imposing excessive pressure on the source database and data production from being affected.

    Note

    To prevent unexpected errors or data quality issues, we recommend that you understand the meanings of the parameters before you change the values of the parameters.

    1. In the upper-right corner of the configuration page, click Configure Advanced Parameters.

    2. In the Configure Advanced Parameters panel, change the values of the desired parameters.

    7. Configure DDL processing rules

    DDL operations may be performed on the source. You can click Configure DDL Capability in the upper-right corner of the page to configure rules to process DDL messages from the source based on your business requirements.

    Note

    For more information, see Configure rules to process DDL messages.

    8. View and change resource groups

    You can click Configure Resource Group in the upper-right corner of the page to view and change the resource groups that are used to run the current synchronization task.

    9. Run the synchronization task

    1. After the configuration of the synchronization task is complete, click Complete in the lower part of the page.

    2. In the Nodes section of the Data Integration page, find the created synchronization task and click Start in the Actions column.

    3. Click the name or ID of the synchronization task in the Tasks section and view the detailed running process of the synchronization task.

    Perform O&M operations on the synchronization task

    View the status of the synchronization task

    After you create a synchronization task, you can view the list of created synchronization tasks and the basic information about each synchronization task on the Synchronization Task page.image

    • You can Start or Stop a synchronization task in the Actions column. You can also Edit, View, and perform other operations on a synchronization task from the More drop-down list.

    • For a started task, you can see the basic status of the task in the Execution Overview section. You can also click the corresponding overview area to view execution details.image

      The real-time synchronization task from MySQL to Hologres consists of three stages:

      • Schema Migration: This tab displays information such as whether a destination table is a newly created table or an existing table. For a newly created table, the DDL statement that is used to create the table is displayed.

      • Full Data Initialization: This tab displays information such as the source tables and destination tables involved in batch synchronization, the synchronization progress, and the number of data records that are synchronized.

      • Real-time Synchronization: This tab displays statistical information about real-time synchronization, including the synchronization progress, DDL records, DML records, and alert information.

    Rerun the synchronization task

    In some special cases, if you add tables to or remove tables from the source, or change the schema or name of a destination table, you can click More in the Actions column of the synchronization task and then click Rerun to rerun the task after the change. During the rerun process, the synchronization task synchronizes data only from the newly added tables to the destination or only from the mapped source table to the destination table whose schema or name is changed.

    • If you want to rerun the synchronization task without modifying the configuration of the task, click More in the Actions column and then click Rerun to rerun the task to perform full synchronization and incremental synchronization again.

    • If you want to rerun the synchronization task after you add tables to or remove tables from the task, click Complete after the change. In this case, Apply Updates is displayed in the Actions column of the synchronization task. Click Apply Updates to trigger the system to rerun the synchronization task. During the rerun process, the synchronization task synchronizes data from the newly added tables to the destination. Data in the original tables is not synchronized again.