ORA-27125问题解决

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ORA-27125问题解决 原创

2020-08-16 14:53:33

Z.l_ 


码龄4年


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问题环境:

在centos6上搭建单机Oracle10G,搭建完成关机后启动报错,报错信息如下:


[root@centos6 ~]# su - oracle

[oracle@centos6 ~]$ sqlplus / as sysdba

SQL> startup;

ORA-27125: unable to create shared memory segment

Linux-x86_64 Error: 1: Operation not permitted

SQL> Disconnected

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ORA-27125: unable to create shared memory segment

Linux-x86_64 Error: 1: Operation not permitted


系统版本:centos6.8


数据库版本: Release 10.2.0.1.0


分析:

根源在于Linux的错误,系统因权限等问题不被允许,所以数据库无法创建共享内存段。在创建共享内存段的时候需要使用到hugepage,系统会进行权限限制。


解决方法:

临时方案:查询dba组的组ID,加入到系统内核中,如下:


[oracle@centos6 ~]$ id oracle

uid=500(oracle) gid=500(oinstall) groups=500(oinstall),501(dba)

# 切换为root用户进行添加

[root@centos6 ~]#  echo 501 > /proc/sys/vm/hugetlb_shm_group

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重新启动数据库


[root@centos6 ~]# su - oracle

[oracle@centos6 ~]$ sqlplus / as sysdba

SQL> startup;

ORACLE instance started.


Total System Global Area  595591168 bytes

Fixed Size                  2022568 bytes

Variable Size             180355928 bytes

Database Buffers          406847488 bytes

Redo Buffers                6365184 bytes

Database mounted.

Database opened.

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临时方案,在系统重启后会失效,永久更改的方法如下


永久方案:修改内核参数文件


[root@centos6 ~]# echo "vm.hugetlb_shm_group = 501" >> /etc/sysctl.conf 

[root@centos6 ~]# sysctl -p

net.ipv4.ip_forward = 0

net.ipv4.conf.default.rp_filter = 1

net.ipv4.conf.default.accept_source_route = 0

kernel.sysrq = 0

kernel.core_uses_pid = 1

net.ipv4.tcp_syncookies = 1

kernel.msgmnb = 65536

kernel.msgmax = 65536

kernel.shmmax = 68719476736

kernel.shmall = 4294967296

kernel.shmall = 2097152

kernel.shmmax = 2147483648

kernel.shmmni = 4096

kernel.sem = 250 32000 100 128

net.ipv4.ip_local_port_range = 1024 65000

net.core.rmem_default = 4194304

net.core.rmem_max = 4194304

net.core.wmem_default = 262144

net.core.wmem_max = 262144

vm.hugetlb_shm_group = 501

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