数据库单机，为什么这么慢呢，这么空闲
| DB Name | DB Id | Instance | Inst num | Startup Time | Release | RAC |
|---|---|---|---|---|---|---|
| XE | 2672432555 | XE | 1 | 16-Aug-12 16:08 | 11.2.0.2.0 | NO |
| Host Name | Platform | CPUs | Cores | Sockets | Memory (GB) |
|---|---|---|---|---|---|
| localhost.localdomain | Linux x86 64-bit | .00 |
| Snap Id | Snap Time | Sessions | Cursors/Session | |
|---|---|---|---|---|
| Begin Snap: | 355 | 29-Aug-12 12:00:20 | ||
| End Snap: | 356 | 29-Aug-12 13:00:40 | ||
| Elapsed: | 60.34 (mins) | |||
| DB Time: | 0.00 (mins) |
Report Summary
那是应该有很多应用（CPU 和Mem没有了）
top - 13:23:32 up 12 days, 21:05, 14 users, load average: 0.13, 3.69, 6.22
Tasks: 433 total, 1 running, 431 sleeping, 1 stopped, 0 zombie
Cpu(s): 13.6%us, 1.3%sy, 0.0%ni, 85.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32841032k total, 31489664k used, 1351368k free, 5940k buffers
Swap: 32767992k total, 403456k used, 32364536k free, 102016k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
14248 root 20 0 1380m 377m 1048 S 195.0 1.2 2398:51 BrdUnostat_pd
28460 root 20 0 1024m 11m 836 S 28.9 0.0 4950:43 BrdUnostat_Abis
以下步骤是自动启动步骤（断电开机后，自动拉起）：
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.32-71.el6.x86_64 #1 SMP Wed Sep 1 01:33:01 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
1.用root在/etc/rc.d/rc.local(是个文件)中添加下面红色的内容
[root@ksdb rc.d]# more rc.local;
#!/bin/sh
#
# This script. will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style. init stuff.
touch /var/lock/subsys/local
##the script. add /etc/rc.d/rc.local##
##start db script###
export ORACLE_SID=XE
export ORACLE_HOME=/u01/app/oracle/product/11.2.0/xe
su - oracle -c "/u01/app/oracle/product/11.2.0/xe/bin/dbstart"
2.设置：用root在
/etc/oratab中设置下面：
[root@localhost ~]# more /etc/oratab
XE:/u01/app/oracle/product/11.2.0/xe:N
把N改成Y
3.修改$ORACLE_HOME/bin/dbstart脚本(先备份dbstart）
注释掉下面一行
ORACLE_HOME_LISTNER=$1
效果如下：
# Set this to bring up Oracle Net Listener
#ORACLE_HOME_LISTNER=$1
添加下面一行：
export ORACLE_HOME_LISTNER=$ORACLE_HOME
效果：
# Set this to bring up Oracle Net Listener
#ORACLE_HOME_LISTNER=$1
export ORACLE_HOME_LISTNER=$ORACLE_HOME
保存dbstart脚本
3.用root.重启，应该就没有问题了