今天一台Linux服务器扩展了一下内存,达到4G,开发的人自己修改了一下SGA结果数据库无法启动了.
启动不了时,出的错误是这个样子的:
[oracle@neirong oracle]$ sqlplus "/ as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on Fri Nov 25 15:43:26 2005
Copyright (c) 1982, 2002, Oracle Corporation.
All rights reserved.
Connected to an idle instance.
SQL startup
ORA-27123: unable to attach to shared memory segment
Linux Error: 22: Invalid argument
Additional information: 1
Additional information: 458753
SQL exit
Disconnected
在32位平台上,缺省的SGA最大只能扩展到1.7G,如果需要支持更大的内存,就需要降低mapped_base,重新Link Oracle软件.
俺的平台为:
[oracle@neirong bdump]$ cat /etc/redhat-release
Red Hat Enterprise Linux AS release 3 (Taroon Update 2)
简单操作如下:
cd $ORACLE_HOME/rdbms/lib
cp ksms.s ksms.s.bak
genksms -s 0x12000000 ksms.s
make -f ins_rdbms.mk ksms.o
make -f ins_rdbms.mk ioracle
此处先备份ksms.s文件,如果编译过程中出现错误,保证操作可以被恢复:
恢复步骤大致如下:
cd $ORACLE_HOME/rdbms/lib
cp ksms.s.bak ksms.s
genksms ksms.s
make -f ins_rdbms.mk ksms.o
make -f ins_rdbms.mk ioracle
以下是操作日志:
[oracle@neirong dbs]$ cd $ORACLE_HOME/rdbms/lib
[oracle@neirong lib]$ genksms -s 0x12000000 ksms.s
[oracle@neirong lib]$ make -f ins_rdbms.mk ksms.o
[oracle@neirong lib]$ make -f ins_rdbms.mk ioracle
- Linking Oracle
rm -f /opt/oracle/product/9.2.0/rdbms/lib/oracle
gcc
-o /opt/oracle/product/9.2.0/rdbms/lib/oracle -L/opt/oracle/product/9.2.0/rdbms/lib/
-L/opt/oracle/product/9.2.0/lib/ -L/opt/oracle/product/9.2.0/lib/stubs/
-Wl,-E `test -f /opt/oracle/product/9.2.0/rdbms/lib/skgaioi.o && echo
/opt/oracle/product/9.2.0/rdbms/lib/skgaioi.o` /opt/oracle/product/9.2.0/rdbms/lib/opimai.o
/opt/oracle/product/9.2.0/rdbms/lib/ssoraed.o /opt/oracle/product/9.2.0/rdbms/lib/ttcsoi.o
/opt/oracle/product/9.2.0/lib/nautab.o /opt/oracle/product/9.2.0/lib/naeet.o
/opt/oracle/product/9.2.0/lib/naect.o /opt/oracle/product/9.2.0/lib/naedhs.o
/opt/oracle/product/9.2.0/rdbms/lib/config.o
-lserver9 -lodm9 -lskgxp9 -lskgxn9 -lclient9
-lvsn9 -lwtcserver9 -lcommon9 -lgeneric9 /opt/oracle/product/9.2.0/rdbms/lib/defopt.o
-lknlopt `if /usr/bin/ar tv /opt/oracle/product/9.2.0/rdbms/lib/libknlopt.a | grep
xsyeolap.o /dev/null 2&1 ; then echo "-loraolap9" ; fi`
-lslax9 -lpls9
-lplp9 -lserver9 -lclient9
-lvsn9 -lwtcserver9 -lcommon9 -lgeneric9
-lknlopt -lslax9 -lpls9
-lplp9 -ljox9 -lserver9 -locijdbcst9 -lwwg9
`cat /opt/oracle/product/9.2.0/lib/ldflags`
-lnsslb9 -lncrypt9 -lnsgr9 -lnzjs9
-ln9 -lnl9 -lnro9 `cat /opt/oracle/product/9.2.0/lib/ldflags`
-lnsslb9 -lncrypt9
......
mv -f /opt/oracle/product/9.2.0/bin/oracle /opt/oracle/product/9.2.0/bin/oracleO
mv /opt/oracle/product/9.2.0/rdbms/lib/oracle /opt/oracle/product/9.2.0/bin/oracle
chmod 6751 /opt/oracle/product/9.2.0/bin/oracle
此后数据库可以以超过1.7G的SGA区设置启动:
SQL startup
ORACLE instance started.
Total System Global Area 2685476820 bytes
Fixed Size
454612 bytes
Variable Size
1073741824 bytes
Database Buffers
1610612736 bytes
Redo Buffers
667648 bytes
Database mounted.
Database opened.
