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Databases Quiz Practice
Active Recall Drill Session
← Exit Session
Question 1 of 1
hard
Databases
What does an `Index Only Scan` represent in an SQL explain plan?
A
The database checked the index but failed to locate any matches
B
The query read data directly from the index pages, avoiding a secondary disk page read to load the table rows
C
The query executed on a single CPU core only
D
The database skipped all constraints checking
Check Answer