In the last section of this chapter, you will learn how to manage a clustered columnstore index (CCI). Besides optimizing query performance, you will also learn how to add a regular B-tree nonclustered index (NCI) to a CCI and use it instead of the primary key or unique constraints. When creating the NCCI in the previous section, the LZ77 or the archive compression has not been used yet. You will use it with a CCI in this section. Altogether, you will learn how to do the following:
Create clustered columnstore indexes
Use archive compression
Add B-tree NCI to a CCI
Use B-tree NCI for a constraint
Update data in a CCI
Let's start by dropping both indexes from the demo fact table, the NCCI and the CI, to make a heap again:
USE WideWorldImportersDW; -- Drop the NCCI DROP INDEX NCCI_FactTest ON dbo.FactTest; -- Drop the CI DROP INDEX CL_FactTest_DateKey ON dbo.FactTest; GO
Now let's create...