Migrating data from PostgreSQL to YDB

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 the transfer.
3. Test your transfer.

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

Required paid resourcesRequired paid resources

The support cost for this solution 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

Set up your data pipeline 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 Snapshot and replication-type transfer and configure it to use the previously created 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. Verify that the data has been transferred from the source Managed Service for PostgreSQL cluster 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. Make sure 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. Make sure 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 incur charges. To avoid unnecessary expenses, delete the resources you no longer need: