Cost-based optimization

Cost-based optimization is a method used by databases to efficiently retrieve data. It evaluates different ways to execute a query—like choosing the best order to join tables or selecting the most suitable indexes—by estimating the resource usage, such as time and computing power. The optimizer then selects the plan with the lowest estimated cost, aiming to deliver results quickly and efficiently. This approach helps databases handle complex queries effectively, balancing speed and resource consumption for optimal performance.