Migrating data from PostgreSQL to YDB

Managed Service for YDB clusters support real-time data ingestion from PostgreSQL databases. The system will automatically insert this data into YDB tables named after the original schemas and tables.

To start data delivery:

1. Set up 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 PostgreSQL cluster: Computing resources allocated to hosts, storage and backup size (see Managed Service for PostgreSQL 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). The cost depends 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 size, and backups.

Getting startedGetting started

Set up your data delivery infrastructure:

Prepare the source clusterPrepare the source cluster

1. Connect to the source cluster’s database with your new user account.

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

   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 your Managed Service for YDB database from the list.

       • Service account ID: Select an existing service account or create a new one 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: Managed Service for PostgreSQL cluster you created earlier.
        • Database: Name of the database you created in the Managed Service for PostgreSQL cluster.
        • User: Name of the user you created in the Managed Service for PostgreSQL cluster.
        • Password: User password.
        • Included tables: <DB_name>.sensors.

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

   3. Activate the transfer.

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

      • target_endpoint_id: ID of the target endpoint.
      • transfer_enabled: 1 to create a source endpoint and a transfer.

   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 PostgreSQL cluster has been transferred to the Managed Service for YDB database:

   Management console

   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. Verify that the Managed Service for YDB database contains the public_sensors table with 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. Verify that the added row’s details have appeared in the Managed Service for YDB database:

   Management console

   YDB 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. Verify that the new data has been added to the public_sensors table.

   1. Connect to the Managed Service for YDB database.

   2. Verify that the new data has been added to the public_sensors table.

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

Delete the resources you createdDelete the resources you created

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