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The Index Spool physical operator contains a SEEK:() predicate in the Argument column. The Index Spool operator scans its input rows, placing a copy of each row in a hidden spool file (stored in the tempdb database and existing only for the lifetime of the query), and builds a nonclustered index on the rows. This allows you to use the seeking capability of indexes to output only those rows that satisfy the SEEK:() predicate.
If the operator is rewound (for example, by a Nested Loops operator) but no rebinding is needed, the spooled data is used instead of rescanning the input.
.gif "Nonclustered index spool operator icon")
Graphical execution plan icon
See Also
Tasks
How to: Display an Actual Execution Plan
Concepts
Logical and Physical Operators Reference
Creating Indexes (Database Engine)
Displaying Execution Plans by Using the Showplan SET Options (Transact-SQL)