This paper proposes and implements a self-optimization mode of query processor SMO which can get more accurate cost estimate,provide optimizer execution plan based on feedback loop.

• 提出并实现了一个自优化查询处理器模型SMO,该模型能够对实际查询结果进行分析,自动调整统计信息,从而准确估计查询开销,提供更优执行计划,增强系统的稳定性。