客户的oracle数据库启动报错,操作linux,oracle 11g由于将lock_sga参数设置为true当重启数据库时报错ORA-27102: out of memory

客户的Oracle数据库启动报错,操作linux,oracle 11g由于将lock_sga参数设置为true当重启数据库时报错ORA-27102: out of memory

SQL> startup nomount
ORA-27102: out of memory
Linux-x86_ Error: 12: Cannot allocate memory

原因是因为操作参数没有设置为允许sga所指定大小的内存可以被锁定
[root@jyrac1 ~]# ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 16384
max locked memory (kbytes, -l) 32
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 16384
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

解决方法有两种
一:ulimit -l unlimited 在启动实例之前执行只对当前会话有效
[root@jyrac1 ~]# ulimit -l unlimited

[root@jyrac1 ~]# su - oracle
[oracle@jyrac1 ~]$ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 16384
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 65536
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 16384
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
[oracle@jyrac1 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Fri Jun 6 12:20:26 2014

Copyright (c) 1982, 2009, Oracle. All rights reserved.

Connected to an idle instance.

SQL> startup nomount
ORACLE instance started.

Total System Global Area 313159680 bytes
Fixed Size 2212936 bytes
Variable Size 109054904 bytes
Database Buffers 197132288 bytes
Redo Buffers 4759552 bytes

SQL> show parameter lock_sga

NAME TYPE VALUE
------------------------------------ ---------------------- ------------------------------
lock_sga boolean TRUE

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在CentOS 6.4下安装Oracle 11gR2(x)

Oracle 11gR2 在VMWare虚拟机中安装步骤

Debian 下 安装 Oracle 11g XE R2

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二:修改/etc/security/limits.conf加入以下信息
oracle soft memlock 10485760
orcale hard memlock 10485760
允许锁定10G的内存
SQL> startup nomount
ORACLE instance started.

Total System Global Area 730714112 bytes
Fixed Size 2216944 bytes
Variable Size 524291088 bytes
Database Buffers 197132288 bytes
Redo Buffers 7073792 bytes

还有lock_sga参数设置为true是不能启用自动内存管理的
SQL> show parameter memory