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In this article:

  • Required paid resources
  • Getting started
  • Set up your transfer
  • Activate the transfer
  • Test the copy function upon re-activation
  • Delete the resources you created
  1. Tutorials
  2. Uploading data to data marts
  3. Greenplum® to ClickHouse®

Loading data from Greenplum® to a ClickHouse® data mart

Written by
Yandex Cloud
Updated at May 5, 2025
  • Required paid resources
  • Getting started
  • Set up your transfer
  • Activate the transfer
  • Test the copy function upon re-activation
  • Delete the resources you created

You can migrate a database from Greenplum® to ClickHouse® using Yandex Data Transfer.

To transfer a database from Greenplum® to ClickHouse®:

  1. Set up your transfer.
  2. Activate the transfer.
  3. Test the copy function upon re-activation.

If you no longer need the resources you created, delete them.

Required paid resourcesRequired paid resources

The support cost includes:

  • Managed Service for Greenplum® cluster fee: Using computing resources allocated to hosts and disk space (see Managed Service for Greenplum® pricing).

  • Managed Service for ClickHouse® cluster fee: Using computing resources allocated to hosts (including ZooKeeper hosts) and disk space (see Managed Service for ClickHouse® pricing).

  • Fee for using public IP addresses if public access is enabled for cluster hosts (see Virtual Private Cloud pricing).

  • Transfer fee: Use of computing resources and the number of transferred data rows (see Data Transfer pricing).

Getting startedGetting started

For clarity, we will create all required resources in Yandex Cloud. Set up your infrastructure:

Manually
Terraform
  1. Create a Yandex Managed Service for Greenplum® source cluster in any suitable configuration.

  2. Create a Yandex Managed Service for ClickHouse® target cluster in any suitable configuration with a database named db1.

  3. If you are using security groups in clusters, make sure they are set up correctly and allow connecting to the clusters:

    • Managed Service for ClickHouse®.
    • Managed Service for Greenplum®.
  1. If you do not have Terraform yet, install it.

  2. Get the authentication credentials. You can add them to environment variables or specify them later in the provider configuration file.

  3. Configure and initialize a provider. There is no need to create a provider configuration file manually, you can download it.

  4. Place the configuration file in a separate working directory and specify the parameter values. If you did not add the authentication credentials to environment variables, specify them in the configuration file.

  5. Download the greenplum-clickhouse.tf configuration file to the same working directory.

    This file describes:

    • Networks and subnets for hosting the clusters.

    • Security groups for connecting to clusters.

    • Managed Service for Greenplum® source cluster.

    • Managed Service for ClickHouse® target cluster.

  6. In the greenplum-clickhouse.tf file, specify the passwords of the Greenplum® and ClickHouse® admin user.

  7. Make sure the Terraform configuration files are correct using this command:

    terraform validate
    

    If there are any errors in the configuration files, Terraform will point them out.

  8. Create the required infrastructure:

    1. Run this command to view the planned changes:

      terraform plan
      

      If you described the configuration correctly, the terminal will display a list of the resources to update and their parameters. This is a verification step that does not apply changes to your resources.

    2. If everything looks correct, apply the changes:

      1. Run this command:

        terraform apply
        
      2. Confirm updating the resources.

      3. Wait for the operation to complete.

    All the required resources will be created in the specified folder. You can check resource availability and their settings in the management console.

Set up your transferSet up your transfer

  1. Create a source endpoint of the Greenplum® type, and specify the cluster connection settings in it.

  2. Create a target endpoint of the ClickHouse type.

  3. Create a transfer of the Snapshot type that will use the created endpoints.

    Replication is not available for this endpoint pair, but you can set up regular copying when creating a transfer. To do this, in the Snapshot field under Transfer parameters, select Regular and specify the copy interval. This will activate a transfer automatically after the specified time interval.

    Warning

    Before configuring regular copying, make sure the target endpoint parameters idicate either a Drop or a Truncate cleanup policy. Otherwise, data on the target will be duplicated.

Activate the transferActivate the transfer

  1. Connect to the Managed Service for Greenplum® cluster, create a table named x_tab, and populate it with data:

    CREATE TABLE x_tab
    (
        id NUMERIC,
        name CHARACTER(5)
    );
    CREATE INDEX ON x_tab (id);
    INSERT INTO x_tab (id, name) VALUES
    (40, 'User1'),
    (41, 'User2'),
    (42, 'User3'),
    (43, 'User4'),
    (44, 'User5');
    
  2. Activate the transfer and wait for its status to change to Completed.

  3. To check that the data was transferred correctly, connect to the Managed Service for ClickHouse® target cluster and make sure that the columns of the x_tab table in the db1 database match those of the x_tab table in the source database:

    SELECT id, name FROM db1.x_tab;
    
    ┌─id─┬─name──┐
    │ 40 │ User1 │
    │ 41 │ User2 │
    │ 42 │ User3 │
    │ 43 │ User4 │
    │ 44 │ User5 │
    └────┴───────┘
    

Test the copy function upon re-activationTest the copy function upon re-activation

  1. Connect to the Managed Service for Greenplum® cluster; in the x_tab table, delete one row and update one:

    DELETE FROM x_tab WHERE id = 41;
    UPDATE x_tab SET name = 'Key3' WHERE id = 42;
    
  2. Reactivate the transfer and wait for its status to change to Completed.

  3. Check the changes in the x_tab table of the ClickHouse® target:

    SELECT id, name FROM db1.x_tab;
    
    ┌─id─┬─name──┐
    │ 42 │ Key3  │
    │ 40 │ User1 │
    │ 43 │ User4 │
    │ 44 │ User5 │
    └────┴───────┘
    

Delete the resources you createdDelete the resources you created

Some resources are not free of charge. To avoid paying for them, delete the resources you no longer need:

  • Make sure the transfer has the Completed status and delete it.

  • Delete both the source endpoint and the target endpoint.

  • Delete the clusters:

    Manually
    Terraform
    • Managed Service for ClickHouse®.
    • Managed Service for Greenplum®.
    1. In the terminal window, go to the directory containing the infrastructure plan.

      Warning

      Make sure the directory has no Terraform manifests with the resources you want to keep. Terraform deletes all resources that were created using the manifests in the current directory.

    2. Delete resources:

      1. Run this command:

        terraform destroy
        
      2. Confirm deleting the resources and wait for the operation to complete.

      All the resources described in the Terraform manifests will be deleted.

ClickHouse® is a registered trademark of ClickHouse, Inc.

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