# What causes writes hotspot (B)


![left](./student-guide/diagram/21-Data-organization-model-02-01.png)

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As can be seen from above, the data of the same table is in a range prefixed with the table ID, and the data is ordered according to the value order of the rowID. If the value of RowID is incremented during a table insert, the inserted row can only be appended at the end. When a Region reaches a certain size, it will be split. After splitting, it can only be added at the end of the Range range, and only insert operations can be performed on one Region to form a hot spot. As shown in the following figure: