ORA-27102:out of memory Linux-x86_64 Error: 12: Cannot allocate memory的處理

客戶的oracle資料庫啟動報錯,操作linux,oracle 11g由於將lock_sga引數設定為true當重啟資料庫時報錯ORA-27102: out of memory

SQL> startup nomount
ORA-27102: out of memory
Linux-x86_64 Error: 12: Cannot allocate memory

原因是因為操作引數沒有設定為允許sga所指定大小的記憶體可以被鎖定

[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

解決方法有兩種
一:ulimit -l unlimited 在啟動例項之前執行只對當前會話有效

[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

二:修改/etc/security/limits.conf加入以下資訊
oracle soft memlock 10485760
orcale hard memlock 10485760
允許鎖定10G的記憶體

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

還有lock_sga引數設定為true是不能啟用自動記憶體管理的

SQL> show parameter memory

NAME                                 TYPE                      VALUE
------------------------------------ ----------------------    ------------------------------
hi_shared_memory_address             integer                   0
memory_max_target                    big integer               0
memory_target                        big integer               0
shared_memory_address                integer                   0

SQL> alter system set memory_max_target=700M scope=spfile;

System altered.

SQL> alter system set memory_target=600M scope=spfile;

System altered.


SQL> shutdown immediate
ORA-01507: database not mounted


ORACLE instance shut down.
SQL> startup nomount
ORA-00847: MEMORY_TARGET/MEMORY_MAX_TARGET and LOCK_SGA cannot be set together

說明lock_sga引數設定為true時是不能啟用自動記憶體管理的