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Update sql-data-warehouse-tables-index.md
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barbkess authored Dec 13, 2016
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Expand Up @@ -91,11 +91,6 @@ To add a non-clustered index on a table, simply use the following syntax:
CREATE INDEX zipCodeIndex ON t1 (zipCode);
```

> [!NOTE]
> A non-clustered index is created by default when CREATE INDEX is used. Furthermore, a non-clustered index is only permitted on a row storage table (HEAP or CLUSTERED INDEX). Non clustered indexes on top of a CLUSTERED COLUMNSTORE INDEX is not permitted at this time.
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## Optimizing clustered columnstore indexes
Clustered columnstore tables are organized in data into segments. Having high segment quality is critical to achieving optimal query performance on a columnstore table. Segment quality can be measured by the number of rows in a compressed row group. Segment quality is most optimal where there are at least 100K rows per compressed row group and gain in performance as the number of rows per row group approach 1,048,576 rows, which is the most rows a row group can contain.

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