Question: Which of these is/are true about SQL Server Query Optimizer? Its always been a const-based optimizer CPU, IO & memory are the only parameters used

Which of these is/are true about SQL Server Query Optimizer?

Its always been a const-based optimizer

CPU, IO & memory are the only parameters used to generate execution plans

Multiple execution plans are tried before finally choosing one

Logical & physical query operations are both the same used by the optimizer

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