Greenplum

Encrypting network traffic

It is a best practice to encrypt network traffic between the Looker application and your database. Consider one of the options described on the Enabling secure database access documentation page.

If you're interested in using SSL encryption, see this official Greenplum security configuration guide.

Users and security

Change some_password_here to a unique, secure password:

CREATE USER looker WITH ENCRYPTED PASSWORD 'password';
GRANT CONNECT ON DATABASE database_name to looker;
\c database_name
GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO looker;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO looker;

To grant Looker the necessary permissions to cancel its queries, run the following command:

CREATE OR REPLACE FUNCTION pg_kill_connection(integer) RETURNS boolean AS 'select pg_terminate_backend($1);' LANGUAGE SQL SECURITY DEFINER;

Temp schema setup

Create a schema owned by the Looker user:

CREATE SCHEMA looker_scratch AUTHORIZATION looker;

Creating the Looker connection to your database

Follow these steps to create the connection from Looker to your database:

  1. In the Admin section of Looker, select Connections, and then click Add Connection.

  2. Select Greenplum from the Dialect drop-down menu.

  3. Fill out the connection details. The majority of the settings are common to most database dialects. See the Connecting Looker to your database documentation page for information.

  4. To verify that the connection is successful, click Test. See the Testing database connectivity documentation page for troubleshooting information.

  5. To save these settings, click Connect.

Feature support

For Looker to support some features, your database dialect must also support them.

Greenplum supports the following features as of Looker 24.20:

Feature Supported?
Support Level
Supported
Looker (Google Cloud core)
No
Symmetric Aggregates
Yes
Derived Tables
Yes
Persistent SQL Derived Tables
Yes
Persistent Native Derived Tables
Yes
Stable Views
Yes
Query Killing
Yes
SQL-based Pivots
Yes
Timezones
Yes
SSL
Yes
Subtotals
Yes
JDBC Additional Params
Yes
Case Sensitive
Yes
Location Type
Yes
List Type
Yes
Percentile
Yes
Distinct Percentile
Yes
SQL Runner Show Processes
Yes
SQL Runner Describe Table
Yes
SQL Runner Show Indexes
Yes
SQL Runner Select 10
Yes
SQL Runner Count
Yes
SQL Explain
Yes
Oauth Credentials
No
Context Comments
Yes
Connection Pooling
Yes
HLL Sketches
No
Aggregate Awareness
Yes
Incremental PDTs
Yes
Milliseconds
Yes
Microseconds
Yes
Materialized Views
No
Approximate Count Distinct
No

Next steps

After completing the database configuration, you can connect to the database from Looker.