Hello, Until 3.0, we had a nice formula to estimate partition size :
sizeof(partition keys) + sizeof(static columns) + countof(rows) * sizeof(regular columns) + countof(rows) * countof(regular columns) * sizeof(clustering columns) + 8 * count(values in partition) With the 3.0 storage engine, the size is supposed to be smaller. And I'm looking for the new formula. I reckon the formula to become : sizeof(partition keys) + sizeof(static columns) + countof(rows) * sizeof(regular columns) + countof(rows) * sizeof(clustering columns) + 8 * count(values in partition) That is the clustering column values are no more repeated for each regular column in the row. Could anyone confirm me that new formula or am I missing something ? Thank you, -- Jérôme Mainaud jer...@mainaud.com