Creating a connection to Greenplum® in Yandex DataLens

To create a Greenplum® connection:

1. Open the new connection creation page.

2. Under Databases, select the Greenplum connection.

3. Select the connection type:

   Select in organization

   Specify manually

   Select a managed database in the current Yandex Cloud organization and specify the internal network connection parameters for it:

   • Cloud and folder: Select the folder the cluster is located in.

   • Cluster: Specify the cluster from the list of available Greenplum® clusters. Cluster settings must have the DataLens access option enabled. If you do not have an available cluster, click Create new.

     Note

     The list shows the following clusters:

     • With permissions for the user creating the connection.
     • Created in the same organization as the DataLens instance.

   • Host type: Select the host type:

     • Regular: Enables you to select regular hosts to connect to.
     • Special FQDNs: Enables you to select a special FQDN, which always points to the Greenplum® primary master host.

   • Host name: Select the host name from the list of hosts available in the Greenplum® cluster. You can select multiple hosts. If you fail to connect to the first host, DataLens will select the next one from the list.

   • Port: Specify the Greenplum® connection port. The default port is 6432.

   • Path to database: Specify the database name.

   • Username: Specify a username for the Greenplum® connection.

   • Password: Specify a password for the user.

   • Cache TTL in seconds: Specify cache TTL or leave the default value. The recommended value is 300 seconds (5 minutes).

   • Raw SQL level: Enables you to use an ad-hoc SQL query to generate a dataset. This option is disabled by default. When enabling it, you will need to select the raw SQL level:

     • Subqueries only: Describe dataset sources using SQL queries.
     • Subqueries and parameters: Describe dataset sources using SQL queries and use source parameterization.
     • SQL to read: Describe dataset sources using SQL queries, use source parameterization, and create QL charts.

   Manually specify your external database details to connect to via a public network:

   • Host name: Specify the path to a master host or a Greenplum® master host IP address. You can specify multiple hosts in a comma-separated list. If you fail to connect to the first host, DataLens will select the next one from the list.
   • Port: Specify the Greenplum® connection port. The default port is 5432.
   • Path to database: Specify the database name.
   • Username: Specify a username for the Greenplum® connection.
   • Password: Specify a password for the user.
   • Cache TTL in seconds: Specify cache TTL or leave the default value. The recommended value is 300 seconds (5 minutes).

   • Raw SQL level: Enables you to use an ad-hoc SQL query to generate a dataset. This option is disabled by default. When enabling it, you will need to select the raw SQL level:

     • Subqueries only: Describe dataset sources using SQL queries.
     • Subqueries and parameters: Describe dataset sources using SQL queries and use source parameterization.
     • SQL to read: Describe dataset sources using SQL queries, use source parameterization, and create QL charts.

4. Optionally, test the connection by clicking Check connection.

5. Click Create connection.

6. Select a workbook to save your connection to or create a new one. If using legacy folder navigation, select a folder to save the connection to. Click Create.

7. Enter a name for the connection and click Create.

Additional settingsAdditional settings

You can specify additional connection settings under Advanced connection settings:

• Setting collate in a query: To explicitly define a collation for database queries, select a mode:

  • Auto: Applies the default setting. DataLens decides whether to enable the en_US locale.
  • On: Applies the DataLens setting. The en_US locale is specified for individual expressions within a query. Thus the server uses the appropriate sorting logic, regardless of the server settings and specific tables. Use the DataLens setting if your database locale is incompatible with DataLens. For more information on the locale and LC_COLLATE, see Creating a cluster.
  • Off: Applies the default setting. DataLens only uses database-level locale settings.

• Disable data export: When this option is on, the data export item will not be available in the menu for the charts based on this connection. However, you will still be able to copy chart data and take screenshots.