王超，祝永志（曲阜师范大学 信息科学与工程学院，山东 日照 276800）摘要：Linux系统是在企业中广泛使用的操作系统，企业亦多基于该操作系统安装数据库。当数据库运行在非归档模式中，且数据库处于无日志备份的情况时，一旦重做日志文件丢失将会导致数据库不可用。
Normally CR block buffer processing does not include the ‘gc cr block flush time’. However， when a CR buffer is cloned from a current buffer that has redo pending， a log flush for a CR block transfer is required. A high percentage is indicative of hot blocks with frequent read after write access.
看看oracle的建议：recommendedswap size· For RHEL 4:Swap should equal 2x physical RAM for up to 2 GB of physical RAM, and then 1x physical RAM for
