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Results tagged with nonclustered-index
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user 28463
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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"Warnings: Operation caused residual I/O" versus key lookups
I've seen this warning in SQL Server 2017 execution plans:
Warnings: Operation caused residual IO [sic]. The actual number of rows read was (3,321,318), but the number of rows returned was 40.
H …
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