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