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4 changes: 3 additions & 1 deletion docs/ingestion/rollup.md
Original file line number Diff line number Diff line change
Expand Up @@ -32,10 +32,12 @@ When you disable rollup, Druid loads each row as-is without doing any form of pr

Use roll-up when creating a table datasource if both:
- You want optimal performance or you have strict space constraints.
- You don't need raw values from [high-cardinality dimensions](schema-design.md#sketches).
- You don't need raw values from [high-cardinality dimensions](schema-design.md#sketches).

Conversely, disable roll-up if either:
- You need results for individual rows.
- You need to execute `GROUP BY` or `WHERE` queries on _any_ column.

If you have conflicting needs for different use cases, you can create multiple tables with different roll-up configurations on each table.

## Maximizing rollup ratio
Expand Down