本文主要从大型数据库ORACLE环境四个不同级别的调整分析入手，分析ORACLE的系统结构和工作机理，从九个不同方面较全面地总结了ORACLE数据库的优化调整方案。-In this paper, mainly from large databases ORACLE environment adjust to four different levels of analysis, analysis ORACLE system structure and working mechanism, from nine different aspects of a more comprehensive manner summed up the ORACLE database optimization adjustment programs.