# Relational Data And KV Transformation

![left](./student-guide/diagram/Table2KV04_001_aa_20220509.png)

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5. We call the collection of Key Values in the database a Region, which is also the logical unit in which we read the data. Obviously, putting all the data in one database into one Region is too inefficient to read. As a result, when a Region reaches a certain size limit, it splits.