dbca，dbca创建数据库

错误信息:

[oracle@db01 ~]$ dbca -silent -responsefile dbca.rsp 
Copying database files
1% complete
2% complete
4% complete
12% complete
100% complete
Look at the log file "/DBSoft/oracle/cfgtoollogs/dbca/woo/woo.log" for further details.
[oracle@db01 ~]$ cat /DBSoft/oracle/cfgtoollogs/dbca/woo/woo.log
SGA size can not be greater than maximum shared memory segment size (0). Refer to Oracle installation guide to configure your operating system kernel parameters.
Copying database files
DBCA_PROGRESS : 1%
DBCA_PROGRESS : 2%
ORA-27102: out of memory


DBCA_PROGRESS : 4%
ORA-01034: ORACLE not available


DBCA_PROGRESS : 12%
ORA-01034: ORACLE not available


DBCA_PROGRESS : 100%

检查alert告警日志：

[oracle@db01 ~]$ cat $ORACLE_BASE/diag/rdbms/woo/woo/trace/alert_woo.log 
Thu Jun 11 22:46:03 2015
Starting ORACLE instance (normal)
WARNING: The system does not seem to be configured
optimally. Creating a segment of size 0x0000000000800000
failed. Please change the shm parameters so that
a segment can be created for this size. While this is
not a fatal issue, creating one segment may improve
performance

问题分析:

    从上面的警告日志中的一个告警信息告诉我们这个系统在启动的时候需要创建一个大小为0x0000000000800000 size的segment失败，虽然不是一个致命的问题，但是同时告诉我们去修改shm参数可以提高性能。

问题处理：

        既然问题已经弄清楚了，那么下一步我们解决该问题就很简单了，扩大/de/shm 的值

1、首先查看下大小是多少:

[oracle@db01 ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_db01-lv_root
                       35G  8.7G   25G  27% /
tmpfs                 947M     0  947M   0% /dev/shm
/dev/sda1             485M   35M  425M   8% /boot

2、手动扩大tmpfs的大小

[root@db01 ~]# mount tmpfs /dev/shm -t tmpfs -o size=8g


[root@db01 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_db01-lv_root
                       35G  8.7G   25G  27% /
tmpfs                 8.0G     0  8.0G   0% /dev/shm
/dev/sda1             485M   35M  425M   8% /boot
tmpfs                 8.0G     0  8.0G   0% /dev/shm

3、重新执行安装

[oracle@db01 ~]$ dbca -silent -responsefile dbca.rsp 
Cleaning up failed steps
5% complete
Copying database files
7% complete
9% complete
16% complete
23% complete
30% complete
41% complete
Creating and starting Oracle instance
43% complete
48% complete
53% complete
57% complete
58% complete
59% complete
62% complete
64% complete
Completing Database Creation
68% complete
71% complete
75% complete
85% complete
96% complete
100% complete
Look at the log file "/DBSoft/oracle/cfgtoollogs/dbca/woo/woo7.log" for further details.
[oracle@db01 ~]$ 




[oracle@db01 ~]$ netca /silent /responsefile netca.rsp 


Parsing command line arguments:
    Parameter "silent" = true
    Parameter "responsefile" = netca.rsp
Oracle Net Configuration Assistant could not find the Response File at the given location.
Oracle Net Services configuration failed.  The exit code is 1

4、完成之后将tmpfs最终的大小永久写入到/etc/fstab文件中

[oracle@db01 ~]$ cat /etc/fstab 


#
# /etc/fstab
# Created by anaconda on Tue Jun  9 19:17:12 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg_db01-lv_root /                       ext4    defaults        1 1
UUID=9ba8ae31-c918-4ad0-8408-e9e0a7d0beb4 /boot                   ext4    defaults        1 2
/dev/mapper/vg_db01-lv_swap swap                    swap    defaults        0 0
tmpfs                   /dev/shm                tmpfs   size=8g        0 0		-------修改这行内容将defaults改为需要扩展的大小size=8g 即可
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0

备注官方文档解释:

         If the value of max_target is set to a value greater than the allocation for the /dev/shm size, then you may encounter the error ORA-00845: MEMORY_TARGET not supported on this system.