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title: Connections in DataLens On-premises
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  Connections in DataLens On-premises contain information about data source
  access parameters.
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# Connecting to a data source in DataLens On-premises

_Connections_ contain information about data source access parameters, such as the DB host IP address and port.

In a single connection, only one data source can be described.

You can create [_datasets_](../../dataset/index.md) based on connections.

The following connection types are available in DataLens:




* [ClickHouse®](../../operations/connection/create-clickhouse.md)
* [PostgreSQL](../../operations/connection/create-postgresql.md)
* [YTsaurus CHYT](../../operations/connection/chyt/create-chyt.md)
* [YDB](../../operations/connection/create-ydb.md)
* [MySQL®](../../operations/connection/create-mysql.md)
* [Greenplum®](../../operations/connection/create-greenplum.md)
* [MS SQL Server](../../operations/connection/create-mssql-server.md)
* [Oracle Database](../../operations/connection/create-oracle.md)
* [Trino](../../operations/connection/create-trino.md)
* [Prometheus](../../operations/connection/create-prometheus.md)
* [Files](../../operations/connection/create-file.md)
* Connecting [API Connector](../../operations/connection/create-api-connector.md)



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_ClickHouse® is a registered trademark of [ClickHouse, Inc](https://clickhouse.com)._
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