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MongoDB Connector for BI

Looker requires at least MongoDB version 4.0+ and MongoDB Connector for BI version 2.6.0+ (where the type_conversion_mode session variable was introduced).

Looker can access MongoDB using the MongoDB Connector for BI using two options:

MongoDB Atlas

Your MongoDB Atlas must use an M10+ cluster. For Looker to use a MongoDB database running on MongoDB Atlas, you must use the MongoDB Connector for BI (MongoBI). Enabling the BI Connector for Atlas requires that MongoDB Atlas use a M10+ cluster.

You must also create a user account that has read permissions for the desired database.

Configuring the MongoDB Connector for BI

Before creating a connection in Looker, your MongoDB or Atlas administrator needs to set up the MongoDB Connector for BI using the following steps, which are explained below:

Adding the Looker Server to the Atlas Whitelist

Atlas only allows client connections from entries in the project’s whitelist. Add Looker’s IP address to the Atlas project’s whitelist:

  1. Get Looker’s IP address.
  2. Follow the Atlas Whitelist Setup instructions to add Looker’s IP address to the Atlas whitelist.

Enabling the MongoDB Connector for BI

Enable the MongoDB Connector for BI:

  1. Verify that you are on a M10+ cluster.
  2. In Atlas, open the Connect page for the cluster. Make a note of the hostname, port, and user. You’ll need to use that information when configuring the connection in Looker.

MongoDB on the Same Server

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

> Install the MongoDB 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 MongoDB 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, enter the use command to switch to the database that Looker will connect to. Then, create a user for Looker with db.createUser() with the role readWrite:

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

Installing the MongoBI JDBC Driver Files

For both MongoDB Connector for BI options, Looker requires configuring JDBC driver files 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:
looker/custom_jdbc_drivers/mongobi/mongosql-auth-1.0.0-rc0.jar
looker/custom_jdbc_drivers/mongobi/mysql-connector-java-5.1.47.jar

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 MongoDB 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.

Follow the Modify MongoDB Users section on this MongoDB documentation page to add the dbOwner role on looker_tmp for the user Looker will use to connect.

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

Adding the Connection

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:

In addition:

Next Steps

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

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