What are the functions of Oracle Explain?

Oracle Explain is a tool for query optimization that helps developers and database administrators analyze query execution plans and evaluate query performance. Its main features include displaying the execution plan of SQL queries, estimating query costs, assisting with index selection, analyzing statistics of tables and indexes, and providing query optimization suggestions. In summary, Oracle Explain offers a range of functionalities to help users understand query execution plans, evaluate query performance, optimize query conditions and index design, and provide query optimization suggestions.