Delivering data from Yandex Managed Service for PostgreSQL to Yandex Managed Service for YDB using Yandex Data Transfer

A Managed Service for YDB cluster can get data from PostgreSQL databases in real time. This data is automatically added to YDB tables with names of source schemas and tables.

To run data delivery:

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

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

Required paid resourcesRequired paid resources

The support cost includes:

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

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

• Fee for the Managed Service for YDB database. The charge depends on the usage mode:

  • For the serverless mode, you pay for data operations and the amount of stored data.
  • For the dedicated instance mode, you pay for the use of computing resources, dedicated DBs, and disk space.

  Learn more about the Managed Service for YDB pricing plans.

Getting startedGetting started

Prepare the data transfer infrastructure:

Prepare the source clusterPrepare the source cluster

1. Connect to the database of the source cluster on behalf of the new user.

2. Add test data to the database. In this example, a simple table with information from car sensors is used.

   Create a table:

   CREATE TABLE public.sensors (
       "device_id" text PRIMARY KEY 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
   );
   

   Populate the table with data:

   INSERT INTO public.sensors VALUES
       ('iv9a94th6rzt********', '2020-06-05 17:27:00', 55.70329032, 37.65472196,  427.5,    0, 23.5, 17, NULL),
       ('rhibbh3y08qm********', '2020-06-06 09:49:54', 55.71294467, 37.66542005, 429.13, 55.5, NULL, 18, 32),
       ('iv9a94th678t********', '2020-06-07 15:00:10', 55.70985913, 37.62141918,  417.0, 15.7, 10.3, 17, NULL);
   

3. Prepare the source cluster for transfer.

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 the 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 an endpoint for the previously created PostgreSQL source with the following settings:

      • Database type: PostgreSQL.
      • Endpoint parameters:
        • Installation type: Managed Service for PostgreSQL cluster.
        • Managed Service for PostgreSQL cluster: Created Managed Service for PostgreSQL cluster.
        • Database: Name of the DB created in the cluster Managed Service for PostgreSQL.
        • User: Name of the user created in the Managed Service for PostgreSQL cluster.
        • Password: User password.
        • Included tables: <DB_name>.sensors.

   2. Create a transfer of the Snapshot and replication type that will use the created endpoints.

   3. Activate the transfer.

   1. In the data-transfer-mpg-ydb.tf file, specify the following parameters:

      • target_endpoint_id: Target endpoint ID.
      • transfer_enabled: 1 to create a source endpoint and a transfer.

   2. 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.

   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.

      Once created, your transfer will be activated automatically.

Test your transferTest your transfer

1. Wait until the transfer status switches to Replicating.

2. Make sure the data from the source Managed Service for PostgreSQL cluster has been moved to the Managed Service for YDB database:

   Management console

   1. In the management console, select the folder with the DB you need.
   2. From the list of services, select Managed Service for YDB.
   3. Select the database from the list.
   4. Navigate to the Navigation tab.
   5. Check that the Managed Service for YDB database contains a table named public_sensors with the test data.

3. Connect to the Managed Service for PostgreSQL source cluster and populate the sensors table with data:

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

4. Check that the Managed Service for YDB database shows information about the added row:

   Management console

   YDB CLI

   1. In the management console, select the folder with the DB you need.
   2. From the list of services, select Managed Service for YDB.
   3. Select the database from the list.
   4. Navigate to the Navigation tab.
   5. Check that public_sensors now contains the new data.

   1. Connect to the Managed Service for YDB database.

   2. Check that public_sensors now contains the new data:

      ydb table query execute \
        --query "SELECT * \
        FROM public_sensors"
      

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: