# Druid

<CommunitySupportedDriver dataSource="Druid" />

## Prerequisites

- The URL for the [Druid][druid] database
- The username/password for the [Druid][druid] database server

## Setup

### Manual

Add the following to a `.env` file in your Cube project:

```dotenv
CUBEJS_DB_TYPE=druid
CUBEJS_DB_URL=https://my.druid.host:8082
CUBEJS_DB_USER=druid
CUBEJS_DB_PASS=**********
```

## Environment Variables

| Environment Variable | Description                                                                         | Possible Values                | Required |
| -------------------- | ----------------------------------------------------------------------------------- | ------------------------------ | :------: |
| <EnvVar>CUBEJS_DB_URL</EnvVar>      | The URL for a database                                                              | A valid database URL for Druid |    ✅    |
| <EnvVar>CUBEJS_DB_USER</EnvVar>     | The username used to connect to the database                                        | A valid database username      |    ✅    |
| <EnvVar>CUBEJS_DB_PASS</EnvVar>     | The password used to connect to the database                                        | A valid database password      |    ✅    |
| <EnvVar>CUBEJS_DB_MAX_POOL</EnvVar> | The maximum number of concurrent database connections to pool. Default is `8`       | A valid number                 |    ❌    |
| <EnvVar>CUBEJS_CONCURRENCY</EnvVar> | The number of [concurrent queries][ref-data-source-concurrency] to the data source | A valid number |    ❌    |

[ref-data-source-concurrency]: /product/configuration/concurrency#data-source-concurrency

## SSL

Cube does not require any additional configuration to enable SSL as Druid
connections are made over HTTPS.

[druid]: https://druid.apache.org/
