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Eager Spooling Against Indexes

Erik Darling finds an eager spool even when there is a good index to use:

But he did write about Eager Index Spools recently, and the post ended with the following statement:

Eager index spools are often a sign that a useful permanent index is missing from the database schema.

I’d like to show you a case where you may see an Eager Index Spool even when you have the index being spooled.

Click through for Erik’s demonstration.