polybase

Polybase is a type of database management system that allows users to query data stored in multiple sources as if it were in a single database. It achieves this by creating a virtual schema that maps to the underlying data sources, which can include relational databases, NoSQL databases, cloud storage, and even spreadsheets. Polybase does not move or copy the data; instead, it generates queries to the original data sources when a query is executed against the virtual schema. This approach simplifies data integration and analysis by eliminating the need for complex ETL (Extract, Transform, Load) processes.

The core concept behind Polybase is its ability to abstract away the heterogeneity of different data stores. Users can write standard SQL queries against the Polybase virtual schema, and Polybase translates these queries into the native query languages of the individual data sources. The results are then combined and returned to the user. This is particularly useful in scenarios where data is distributed across various systems, such as in big data environments or hybrid cloud architectures. Polybase often requires installation and configuration on a server that can access all the relevant data sources. Its primary benefit lies in enabling unified access and querying capabilities over disparate data.