The nonclustered-index tag should be used for questions regarding how to implement and troubleshoot supplemental indexes used primarily to enhance performance. The term nonclustered is typically a SQL Server-specific term.

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5
votes
2answers
348 views

Need for reaching data through clustered index with a non-clustered index

I have found that when a table has both clustered and non-clustered indexes (on different columns), the leaf level non-clustered pages, instead of pointing to the data row, point to the node of the ...
7
votes
1answer
270 views

Query optimizer recommends adding index instead of using existing index

I am trying to determine why the query optimizer in SQL Server is recommending creating a new index instead of using an existing index that appears to be sufficient for the query. First the table. ...
3
votes
3answers
528 views

Why is the SQL Server query plan not using indexes in a query almost similar to one that uses indexes?

I have two UPDATE queries that are similar in structure, yet the SQL Server query plan for one shows indexes being used, and for the other it shows only a regular table scan. The following are the ...