# Distributed Transactions (Continued...)

![right](./student-guide/diagram/PercolatorTiKV02_en_001_20220511.png)
+ Write column: When a user writes a row of data, if the length of the row is less than 255 bytes, it is stored in the write column; otherwise, the row is stored in the default column.
+ Default column: Used to store data greater than 255 bytes in length.

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