What is a cost-based query optimizer in the context of database query optimization?
- A method for prioritizing database queries based on their frequency of execution.
- A software tool that analyzes the syntax of SQL queries and suggests optimizations.
- A technique for optimizing database queries based on the estimated cost of various execution plans.
- An algorithm used to encrypt sensitive data during query execution.
A cost-based query optimizer evaluates different ways to execute a query and chooses the one with the lowest estimated cost. It considers factors such as available indexes, table sizes, and statistical information to estimate the cost of various execution plans. By selecting the plan with the lowest estimated cost, it aims to improve query performance.
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