Always • Avoided • Based • Considering • Considers • Cost • Data • Determine • Down • During • Efficiency • Estimate • Goals • Help • Highest • Improve • Include • Inefficient • Involve • Involves • Joins • Least • Lowest • Minimize • Nested • Optimizer • Over • Overall • Overview • Plans • Prioritize • Process • Providing • Query. • Reduce • Relies • Required • Resources • Selecting • Selects • Solely • Sorting • Specific • System • Table • Tables. • Take • Uses • Utilization • Various