You have a Fabric workspace that contains a Real-Time Intelligence solution and an eventhouse. Users report that from OneLake file explorer, they cannot see the data from the eventhouse. You enable OneLake availability for the eventhouse. What will be copied to OneLake?

Enabling OneLake availability for a Fabric eventhouse initiates a continuous process to make its data accessible in OneLake. This process begins by exporting all existing data from the eventhouse into the Delta Lake format within OneLake. Subsequently, any new data ingested into the eventhouse is also automatically and continuously exported to OneLake. This ensures that a complete and up-to-date mirror of the eventhouse data is available for use by other Fabric engines and tools like OneLake file explorer.

A. The OneLake availability setting applies to the entire eventhouse, including all its existing and future databases, not just new ones.

B. The process is continuous, ensuring that newly ingested data is also made available, not just a one-time copy of existing data.

C. The explicit purpose of enabling "OneLake availability" is to copy data to OneLake; selecting "no data" contradicts the feature's function.

E. The initial step of the process is to export all historical data, so it is not limited to only new data ingested after activation.

1. Microsoft. (2024). Manage an eventhouse in Microsoft Fabric. Microsoft Learn. Retrieved from https://learn.microsoft.com/en-us/fabric/real-time-intelligence/eventhouse-manage#onelake-availability.

Reference Details: In the "OneLake availability" section

the documentation states

"When you enable OneLake availability... the process starts to export all existing data from your eventhouse to OneLake... After the initial export

any newly ingested data is exported as it arrives." This directly supports that both existing and new data are included.