.oraenv xxx

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alter system set sga_max_size=4g scope=spfile;

sql>alter system set sga_target=4g;

sql>startup force;

ORA-27102: out of memory

SQL> startup nomount

ORA-27102: out of memory

SQL> shutdown immediate

ORA-01034: ORACLE not available

ORA-27101: shared memory realm does not exist

Linux Error: 2: No such file or directory

SQL> quit

Disconnected

--做一个pfile，进去修改设置出错的参数，注意strings出来的控制文件格式可能有问题

[oracle@edsir1p8- dbs]$ strings spfilePROD4.ora >>/home/oracle/aa.ora

[oracle@edsir1p8-PROD4 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Wed Jun 21 09:14:12 2017

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

Connected to an idle instance.

SQL> startup pfile='/home/oracle/aa.ora'

ORACLE instance started.

Total System Global Area  129724416 bytes

Fixed Size    1334996 bytes

Variable Size  113246508 bytes

Database Buffers    8388608 bytes

Redo Buffers    6754304 bytes

Database mounted.

Database opened.

SQL> show parameter spfile;

NAME     TYPE VALUE

-spfile     string

SQL> create spfile from pfile='/home/oracle/aa.ora'  ;

File created.

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

otal System Global Area  129724416 bytes

Fixed Size    1334996 bytes

Variable Size  113246508 bytes

Database Buffers    8388608 bytes

Redo Buffers    6754304 bytes

Database mounted.

Database opened.

SQL> show parameter spfile;

NAME     TYPE VALUE

------------------------------------ ----------- --------------------------

----spfile     string /u01/app/oracle/product/11.2.0

名称栏目：调整参数导致数据库无法启动
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