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SQL Server uses bitmaps internally to speed up query execution by eliminating rows with key values that cannot produce any join records. SQL Server uses these bitmaps only in parallel query plans. Bitmap is a physical operator.
.gif "Bitmap operator icon")
Graphical execution plan icon
See Also
Tasks
How to: Display an Actual Execution Plan
Reference
Bitmap Create Showplan Operator
Concepts
Logical and Physical Operators Reference
Displaying Execution Plans by Using the Showplan SET Options (Transact-SQL)
Parallel Query Processing