Are Clustered Index Scans Bad?
Clustered Index Scan Good or Bad: If I Had to Make a Decision Whether It Is a Good or Bad, It Could Be a Bad. Unless a Large Number of Rows, with Many Columns...
Does a clustered index improve performance?
Effective Clustered Indexes can often improve the performance of many operations on a SQL Server table. ... To be clear, having a non-clustered index along with the clustered index on the same columns will degrade performance of updates, inserts, and deletes, and it will take additional space on the disk.
Is Clustered index Scan better than table scan?
And, of course, a clustered index lets you do a CLUSTERED INDEX SEEK, which is pretty much optimal for performance...a heap with no indexes would always result in a table scan. So: For your example query where you select all rows, the only difference is the doubly linked list a clustered index maintains.
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