Linux查看CPU信息、机器型号等硬件信息
测试机器的硬件信息: 查看CPU信息(型号) # cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c 8 Intel(R) Xeon(R) CPU &...
RAID0+1与RAID1+0 比较
RAID0+1和RAID1+0的比较: RAID 0+ 1 优点:正常使用中,考虑性能上讲,RAID0+1 好,就是先做RAID 0 条带,再做 RAID 1 MIRROR,这样写入速度快,读的速度和RAID1+0一样。 缺点:一旦一...
RAID0+1
RAID 1和RAID 0都各有优点,但如果单独使用RAID 1或RAID 0都无法满足追求性能又要确保系统资料安全性的用户的需要。为了解决这一问题,人们又推出 RAID 0+1 模式。 把RAID0和RAID1技术结合起来,即RAID0+1。...
ORA-01102: cannot mount database in EXCLUSIVE mode
ORA-01102: cannot mount database in EXCLUSIVE mode作者:小米爸爸链接:http://www.dbifan.com/200704/ora-01102-cannot-mount-database-in-exclusive-mode.html今天在STARTUP一数据库时,发生如下错误:SQL> conn /as sysdbaConnected to an idle instance.SQL> startuporacle instance started.Total System Global Area 276824064 bytesFixed Size 778736 bytesVariable Size 137371152 bytesDatabase Buffers 138412032 bytesRedo Buffers 262144 bytesORA-01102: cannot mount database in EXCLUSIVE modeSQL> shutdown im
alter database backup controlfile to trace
alter database backup controlfile to ['filename' | trace]This command comes in two versions. One backs up the control file in a binary format while the other backs it up in a human readable form.It is...