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MongoDB Using Mongo Connector for BI (MongoBI) on the Same Server

There are several ways Looker can use Mongo Connector for BI (MongoBI) to access MongoDB:

Installing the MongoBI JDBC Driver Files

Looker uses Mongo’s authentication plugin, so you must update Mongo’s driver to the custom JDBC by doing the following steps:

Download these two JAR files:

Follow the steps on the Custom JDBC Drivers documentation page using the values below:

driver symbol: mongobi

driver entry:

- name: mongobi
  dir_name: mongobi
  module_path: com.mysql.jdbc.Driver
  override_jdbc_url_subprotocol: mysql

If you are on Looker 6.2 or below:

- name: maria15x
  dir_name: mongobi
  module_path: com.mysql.jdbc.Driver
  override_jdbc_url_subprotocol: mysql

For the step to put the driver in your dialect’s directory, the paths to these files will look like this:

Configuring the Mongo Connector for BI

Before creating a connection in Looker, your MongoDB administrator should set up MongoDB and the Mongo Connector for BI using the following steps, which are explained below:

Installing the Mongo Connector for BI

To use Looker, you must be running MongoDB 4.0 (or later) and the Mongo Connector for BI 2.6.1 (or later).

Install the Mongo Connector for BI on the same server as the MongoDB database, as explained on the Install BI Connector On Premises MongoDB documentation page.

Encrypting Network Traffic

The Mongo Connector for BI requires using SSL encryption between MongoDB’s server and the Looker application. Follow the SSL setup instructions on the Configure SSL for BI Connector MongoDB documentation page.

Setting Up the Looker User and Permissions

In the MongoDB shell, create a user for Looker with the role readWriteAnyDatabase:

  1. Specify the database that you want Looker to access:

use my_db_name

  1. Create a new user, typically called looker, and give it readWriteAnyDatabase permission. In the following example, change some_password_here to a unique, secure password:

db.createUser( { user: looker, pwd: some_password_here, roles: [ “readWriteAnyDatabase” ] } )

Allowing Use of Regular Derived Tables (Recommended)

Derived tables are important tools in Looker that enable you to expand the sophistication of your analyses. They can also play a valuable role in enhancing query performance. At a high level, Looker’s derived table functionality provides a way to create new tables that don’t already exist in your database.

The Mongo Connector for BI supports temporary regular derived tables but does not yet support persistent derived tables.

Since regular derived tables are temporary, they do not need to be stored. Thus, you don’t need to create a schema for them. However, you need to grant the dbOwner role to looker_tmp schema, even if that schema does not exist.

db.grantRolesToUser(“looker”, [ {role: “dbOwner”, db: ”looker_tmp” ])

Connecting Looker to Mongo

Configure a database connection via the Looker interface. From the Admin section, select Connections then New Connection. See the Connecting Looker to Your Database documentation page for more information.

Click on Test These Settings to verify the connection is successful. The Testing Database Connectivity documentation page has troubleshooting information.

Using SQL Functions and Operators with MongoDB Connector for BI

When developing using a MongoDB Connector for BI connection, you can use the SQL functions and operators listed on this MongoDB documentation page.

Feature Support

Looker’s ability to provide some features depends on whether the database dialect can support them.

In the current Looker release, MongoDB supports the following Looker features:

MongoBI connections also do not support:

In addition, Looker treats all timestamps accessed from MongoBI as being in the coordinated universal time (UTC) time zone.

Next Steps

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