Migrating data from MySQL® to YDB

Data Transfer enables you to transfer data from a Managed Service for MySQL® source cluster to Managed Service for YDB.

To transfer data:

1. Prepare the source cluster.
2. Set up and activate the transfer.
3. Test your transfer.

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

Required paid resourcesRequired paid resources

• Managed Service for MySQL® cluster: Computing resources allocated to hosts, storage and backup size (see Managed Service for MySQL® pricing).

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

• Managed Service for YDB database (see Managed Service for YDB pricing). Its pricing is based on deployment mode:

  • In serverless mode, you pay for data operations and storage volume, including stored backups.
  • In dedicated instance mode, you pay for the use of computing resources allocated to the database, storage and backup size.

Set up your infrastructureSet up your infrastructure

Prepare the source clusterPrepare the source cluster

1. If you created the infrastructure manually, set up your source cluster.

2. Connect to the Managed Service for MySQL® source cluster.

3. Populate the database with test data. In this example, we will use a simple table with car sensor information.

   Create a table:

   CREATE TABLE measurements (
       device_id varchar(200) NOT NULL,
       datetime timestamp NOT NULL,
       latitude real NOT NULL,
       longitude real NOT NULL,
       altitude real NOT NULL,
       speed real NOT NULL,
       battery_voltage real,
       cabin_temperature real NOT NULL,
       fuel_level real,
       PRIMARY KEY (device_id)
   );
   

   Populate the table with data:

   INSERT INTO measurements VALUES
       ('iv9a94th6rzt********', '2022-06-05 17:27:00', 55.70329032, 37.65472196,  427.5,    0, 23.5, 17, NULL),
       ('rhibbh3y08qm********', '2022-06-06 09:49:54', 55.71294467, 37.66542005, 429.13, 55.5, NULL, 18, 32);
   

Set up and activate the transferSet up and activate the transfer

1. Create a target endpoint:

   • Database type: YDB.

   • Endpoint parameters:

     • Connection settings → Database: Select your Managed Service for YDB database from the list.

     • Service account ID: Select or create a service account with the ydb.editor role.

2. Create a source endpoint and transfer:

   Manually

   Terraform

   1. Create a source endpoint:

      • Database type: MySQL®

      • Endpoint parameters → Connection settings: Managed Service for MySQL cluster

        Select your source cluster from the list and specify its connection settings.

   2. Create a Snapshot and replication-type transfer configured to use the new endpoints.

   3. Activate the transfer.

   1. In the data-transfer-mmy-ydb.tf file, uncomment the following:

      • target_endpoint_id variable. Also, set it to the ID of the target endpoint created in the previous step.
      • yandex_datatransfer_endpoint and yandex_datatransfer_transfer resources.

   2. Validate your Terraform configuration files using this command:

      terraform validate
      

      Terraform will display any configuration errors detected in your files.

   3. 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.

      The transfer will activate automatically upon creation.

Test the transferTest the transfer

1. Wait for the transfer status to change to Replicating.

2. Make sure that the data from the source Managed Service for MySQL® cluster has been transferred to the Managed Service for YDB database:

   Management console

   CLI

   1. In the management console, select the folder containing your database.
   2. From the list of services, select Managed Service for YDB.
   3. Select your database from the list.
   4. Navigate to the Navigation tab.
   5. Check that the Managed Service for YDB database contains the <source_cluster_DB_name>_measurements table with test data.

   1. Connect to the Managed Service for YDB database.

   2. Check that the database contains the <source_cluster_DB_name>_measurements table with test data:

      SELECT *
      FROM <source_cluster_DB_name>_measurements;
      

3. Connect to the Managed Service for MySQL® source cluster and populate the measurements table with data:

   INSERT INTO measurements VALUES
       ('iv7b74th678t********', '2020-06-08 17:45:00', 53.70987913, 36.62549834, 378.0, 20.5, 5.3, 20, NULL);
   

4. Verify that the added row’s details have appeared in the Managed Service for YDB database:

   Management console

   CLI

   1. In the management console, select the folder containing your database.
   2. From the list of services, select Managed Service for YDB.
   3. Select your database from the list.
   4. Navigate to the Navigation tab.
   5. Make sure the <source_cluster_DB_name>_measurements table now contains the new data.

   1. Connect to the Managed Service for YDB database.

   2. Make sure the <source_cluster_DB_name>_measurements table now contains the new data:

      SELECT *
      FROM <source_cluster_DB_name>_measurements;
      

Delete the resources you createdDelete the resources you created

To reduce the consumption of resources you do not need, delete them:

1. Delete the transfer.

2. Delete the target endpoint.

3. If you created a service account when creating the target endpoint, delete it.

4. Delete the other resources depending on how you created them:

   Manually

   Terraform

   1. Delete the source endpoint.
   2. Delete the Managed Service for YDB database.
   3. Delete the Managed Service for MySQL® cluster.

   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.