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cubes reference data from different databases. Usually, data sources are configured statically (see below). However, Cube can also lookup data sources dynamically which is useful in complex scenarios involving multitenancy.

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Environment variables

Declare the list of data sources using the CUBEJS_DATASOURCES environment variable, then use decorated environment variables to configure each data source: 
CUBEJS_DATASOURCES=default,datasource1
CUBEJS_DB_TYPE=postgres
CUBEJS_DB_NAME=ecom
CUBEJS_DB_HOST=localhost
CUBEJS_DS_DATASOURCE1_DB_TYPE=postgres
CUBEJS_DS_DATASOURCE1_DB_NAME=ecom
CUBEJS_DS_DATASOURCE1_DB_HOST=remotehost
Cube expects that the default data source is always defined. Ensure that CUBEJS_DB_* environment variables are set or that the default data source is defined using driverFactory in your cube.js file.

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Decorated environment variables

Cube allows database-specific environment variables to be decorated with a data source name: 
CUBEJS_[DS_<DATASOURCE>_]<ENV_VAR>
For example, using the datasource1 data source, CUBEJS_DB_TYPE could be decorated as: 
CUBEJS_DS_DATASOURCE1_DB_TYPE=postgres
For more information on environment variables that support decoration, check the environment variables reference or database-specific pages.

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Data model

Use the data_source property to set a data source for each cube: 
cubes:
  - name: orders
    # ...

    data_source: default

  - name: orders_from_other_data_source
    # ...

    data_source: other_data_source

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Cube Cloud

Follow these steps to connect to multiple data sources in Cube Cloud:
  • Set up the default database connection when creating a new deployment.
  • Ensure you have the correct multitenancy configuration in your cube.js file.
  • Configure the corresponding environment variables in Settings → Environment variables.