Loading data from PostgreSQL to Yandex Object Storage

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Updated at April 5, 2024

Getting started
Set up the transfer
Activate the transfer
Check the copy function upon re-activation
Delete the resources you created

You can migrate a database from Yandex Managed Service for PostgreSQL to Yandex Object Storage using Yandex Data Transfer. To do this:

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

Getting started

Prepare the infrastructure:

Manually

Terraform

Create a source Managed Service for PostgreSQL cluster in any applicable configuration with publicly available hosts and the following settings:
- DB name: db1
- Username: pg-user
- Password: <source_password>
If you are using security groups in your cluster, make sure they are set up correctly and allow connecting to the cluster:
Create a Yandex Object Storage bucket.
Create a service account named storage-sa with the storage.uploader role. The transfer will use it to access the bucket.

If you do not have Terraform yet, install it.
Get the authentication credentials. You can add them to environment variables or specify them later in the provider configuration file.
Configure and initialize a provider. There is no need to create a provider configuration file manually, you can download it.
Place the configuration file in a separate working directory and specify the parameter values. If you did not add the authentication credentials to environment variables, specify them in the configuration file.
Download the postgresql-to-objstorage.tf configuration file to the same working directory.

This file describes:
- Network.
- Subnet.
- Security group required to connect to a cluster.
- Managed Service for PostgreSQL source cluster.
- Service account to be used to create and access the bucket.
- Object Storage target bucket.
- Source endpoint.
- Transfer.
In the postgresql-to-objstorage.tf file, specify:
- PostgreSQL user password.
- Bucket name consistent with the naming conventions.
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.
Create the required infrastructure:
1. Run the command to view planned changes:
```
terraform plan
```
  If the resource configuration descriptions are correct, the terminal will display a list of the resources to modify and their parameters. This is a test step. No resources are updated.
2. If you are happy with the planned changes, apply them:
  1. Run the command:
```
terraform apply
```
  2. Confirm the update of resources.
  3. Wait for the operation to complete.
All the required resources will be created in the specified folder. You can check resource availability and their settings in the management console.

Set up the transfer

Connect to the Managed Service for PostgreSQL cluster, create a table called x_tab in the db1 database, and populate it with data:

CREATE TABLE x_tab
(
    id NUMERIC PRIMARY KEY,
    name CHAR(5)
);
INSERT INTO x_tab (id, name) VALUES
  (40, 'User1'),
  (41, 'User2'),
  (42, 'User3'),
  (43, 'User4'),
  (44, 'User5');

Create a target endpoint of the Object Storage type with the following settings:
- Bucket: <name_of_previously_created_bucket>
- Service account: storage-sa
- Serialization format: CSV
- Encoding format: UNCOMPRESSED
- Folder name: from_PostgreSQL
Create a source endpoint and a transfer.

Manually

Terraform

Create a source endpoint of the PostgreSQL type and specify the cluster connection parameters in it:
- Connection type: Managed Service for PostgreSQL cluster
- Managed Service for PostgreSQL cluster: <name_of_PostgreSQL_source_cluster> from the drop-down list
- Database: db1
- User: pg-user
- Password: <user_password>
Create a transfer of the Snapshot type that will use the created endpoints.

In the postgresql-to-objstorage.tf file, specify the variables:
- objstorage_endpoint_id: ID of the target endpoint.
- transfer_enabled: Set 1 to enable transfer creation.
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.
Create the required infrastructure:
1. Run the command to view planned changes:
```
terraform plan
```
  If the resource configuration descriptions are correct, the terminal will display a list of the resources to modify and their parameters. This is a test step. No resources are updated.
2. If you are happy with the planned changes, apply them:
  1. Run the command:
```
terraform apply
```
  2. Confirm the update of resources.
  3. Wait for the operation to complete.

Activate the transfer

Activate the transfer and wait for its status to change to Completed.
Make sure that the Object Storage bucket now includes the public_x_tab.csv file with the data from the x_tab table.

Check the copy function upon re-activation

Connect to the Managed Service for PostgreSQL cluster and, in the x_tab table, delete the row where ID equals 41, and edit the row where ID is 42:
```
DELETE FROM x_tab WHERE id = 41;
UPDATE x_tab SET name = 'Key3' WHERE id = 42;
```
Reactivate the transfer and wait for its status to change to Completed.
Make sure the changes are now reflected in the public_x_tab.csv file in the target cluster.

Delete the resources you created

Some resources are not free of charge. To avoid paying for them, delete the resources you no longer need:

Make sure the transfer status is Completed.
Delete the target endpoint.
Delete the transfer, source endpoint, cluster, and bucket:
Manually

Terraform
1. In the terminal window, go to the directory containing the infrastructure plan.
2. Delete the postgresql-to-objstorage.tf configuration file.
3. 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.
4. Confirm updating the resources.
  1. Run the command to view planned changes:
    
    terraform plan
    
    If the resource configuration descriptions are correct, the terminal will display a list of the resources to modify and their parameters. This is a test step. No resources are updated.
  2. If you are happy with the planned changes, apply them:
    
    Run the command:
    
    terraform apply
    
    Confirm the update of resources.
    
    Wait for the operation to complete.
  All the resources described in the postgresql-to-objstorage.tf configuration file will be deleted.

Loading data from PostgreSQL to Yandex Object Storage

Getting startedGetting started

Set up the transferSet up the transfer

Activate the transferActivate the transfer

Check the copy function upon re-activationCheck the copy function upon re-activation

Delete the resources you createdDelete the resources you created

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Getting started

Set up the transfer

Activate the transfer

Check the copy function upon re-activation

Delete the resources you created