ORA-27125: unable to create shared memory segment

--着急建测试环境，慌张报错@@
测试环境：
oracle 10.2.0.1
red-hat7.1


dbca报错1：
ORA-27125: unable to create shared memory segment
Linux-x86_64 Error: 1: Operation not permitted


解决办法：
# more /proc/sys/vm/hugetlb_shm_group
0

# id ora10g
uid=54323(ora10g) gid=54321(oinstall) groups=54321(oinstall),54322(dba)

# vi /etc/sysctl.conf
加入如下的内容，其中54322为dba组号，需要根据你实际的情况进行改变。
vm.hugetlb_shm_group = 54322

# sysctl -p

dbca报错2：
ORA-00600: internal error code, arguments: [keltnfy-ldmInit], [46], [1], [], [], [], [], []

原因：
/etc/hosts没配

opatch报错3：
[oracle@esbtstdb db_1]$ opatch lsinventory
Invoking OPatch 10.2.0.5.1


Oracle Interim Patch Installer version 10.2.0.5.1
Copyright (c) 2010, Oracle Corporation.  All rights reserved.

Oracle Home       : /oracle/app/oracle/product/10.2/db_1
Central Inventory : n/a
   from           : 
OPatch version    : 10.2.0.5.1
OUI version       : 10.2.0.1.0
OUI location      : /oracle/app/oracle/product/10.2/db_1/oui
Log file location : n/a

Patch history file: /oracle/app/oracle/product/10.2/db_1/cfgtoollogs/opatch/opatch_history.txt

OPatch cannot find a valid oraInst.loc file to locate Central Inventory.

OPatch failed with error code 104

解决办法：
#chmod 644 /etc/oraInst.loc

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