MySQL® change data capture and delivery to YDS

You can track data changes in a Managed Service for MySQL® source cluster and send them to a Data Streams target cluster using change data capture (CDC).

To set up CDC using Data Transfer:

1. Set up your transfer.
2. Activate the transfer.
3. Test the replication process.

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, size of storage and backups (see Managed Service for MySQL® pricing).

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

• Each transfer: use of computing resources and number of transferred data rows (see Data Transfer pricing).

• Managed Service for YDB database. 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, size of storage and backups.

  See Managed Service for YDB pricing.

• Data Streams: The cost depends on the pricing model:

  • Based on allocated resources: You pay a fixed hourly rate for the established throughput limit and message retention period, and additionally for the number of units of actually written data.
  • On-demand: You pay for the performed read/write operations, the amount of read or written data, and the actual storage used for messages that are still within their retention period.

  See Data Streams pricing.

Getting startedGetting started

Set up the infrastructure:

Set up your transferSet up your transfer

1. Create a data stream in Data Streams named mpg-stream.

2. Connect to the Managed Service for MySQL® cluster, create a table named measurements in the db1 database, and populate it with data:

   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)
   );
   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);
   

3. Create a target endpoint of the Data Streams type with the following settings:

   • Database: ydb-example
   • Stream: mpg-stream
   • Service account: yds-sa

4. Create a source endpoint and transfer:

   Manually

   Terraform

   1. Create a source endpoint of the MySQL® type and specify these cluster connection settings in it:

      • Connection type: Managed Service for MySQL cluster
      • Managed Service for MySQL cluster: <source_cluster_name> from the drop-down list.
      • Database: db1
      • User: mmy-user
      • Password: mmy-user password.

   2. Create a transfer of the Replication type that will use the new endpoints.

   1. In the mysql-yds.tf file, specify these variables:

      • yds_endpoint_id: ID of the target endpoint.
      • transfer_enabled: Set to 1 to create a transfer.

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

      terraform validate
      

      Terraform will show any errors found in your configuration 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.

Activate the transferActivate the transfer

1. Activate the transfer and wait for its status to change to Replicating.

Make sure the data from the source has been moved to the Data Streams stream:

Test the replication processTest the replication process

1. Connect to the source cluster.

2. Add a new row to the measurements table:

   INSERT INTO measurements VALUES
       ('ad02l5ck6sdt********', '2022-06-05 17:27:00', 55.70329032, 37.65472196,  427.5,    0, 23.5, 19, 45);
   

3. Make sure you can now see the new row in your data stream.

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:

1. Delete the transfer.
2. Delete the target endpoint.
3. Delete the stream in Data Streams.

Delete the other resources depending on how you created them: