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title: DataLens On-premises error ERR.DS_API.DB.DB_OPERATIONAL_ERROR
description: This page describes the Database-side error in DataLens On-premises.
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# [DataLens On-premises] Database-side error

`ERR.DS_API.DB.DB_OPERATIONAL_ERROR`

An error in the database that is not always monitored by the user.

The possible causes might include the following:

* Unexpected disconnect.
* No data source name found.
* Failure to process the transaction.
* Memory allocation error that occurs while processing the transaction.