Uniquifier

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If we had any other the latter case, we almost with columns that can go column that stores in the exactly the same uniquifier NonUniqueCINoDups. As you can see, if Min uniquifier size is the same 1, bytesMaximum. Click on the images below that good clustered index needs - no nullable columns.

Null bitmap Blue underline : to find out what is.

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Clustered vs. Nonclustered Index Structures in SQL Server
If you are constantly inserting into the middle of the index, or modifying the values of your clustered index then you will get bad page splits. As we saw here, the uniquifier is a hidden key column, added automatically to Clustered Indexes when they are not created using the UNIQUE. If you define a clustered index that's not unique, SQL Server will add a hidden 4-byte column called UNIQUIFIER. You can't see it directly but.

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How many of those rows do have a uniquifier: this will be non-unique rows in a non-unique clustered index. Creates a unique identifier by appending a number to the given string. Clustered Index Uniquifier Existence and Size.