Index Type Limits

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Index Type Limits

Steve Jones - SSC Editor

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August 9, 2021 at 12:00 am

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Comments posted to this topic are about the item Index Type Limits

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Robert Eder SSCarpal Tunnel Points: 4184 More actions · Answer 1

Xml is indexable with the restriction that it is the only key column. See https://docs.microsoft.com/en-us/sql/relational-databases/sql-server-index-design-guide?view=sql-server-ver15.

If the question was worded as "Which of these data types are not allowed for the columns to add to an existing index?" or "If adding multiple columns to an index, which of these data types are not allowed for the columns to add to an existing index?"

Steve Jones - SSC Editor SSC Guru Points: 736255 More actions · Answer 2

Updated to add multi-column index. Thanks for the note.

Jeff Moden SSC Guru Points: 1004356 More actions · Answer 3

Still not quite right. The MAX datatypes (LOBs) ARE actually allowed in RowStore indexes. They're allowed in INCLUDEs, just not as a key.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

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