1. 关闭防火墙-# firewall-cmd --state-# systemctl stop firewalld.service-# systemctl disable firewalld.service-# vi /etc/selinux/configSELINUX=disabled ，然后重启2) 虚拟机IP配置BOOTPROTO=staticIPADDR=192.168.220.

Filesystems that manage the storage across a network of machines are called distributed filesystems. Since they are network based, all the complications of network programming kick in, thus making dis

1. commit和rollback1) commit之前a)困难的工作已经完成，数据已经修改，99%的工作已经完成。b)已经在SGA中生成了undo块c)已经在SGA中生成了已修改数据块。d)已经在SGA中生成了对于前两项的缓存redo。e)已经得到了所需的全部锁。