今天升级数据库碰到一个很郁闷的问题，把10g的数据库升级到11g以后，结果有一个改动，需要重启数据库，就敲了shutdown immediate，结果再startup,数据库竟然起不来了。

$ORACLE_HOME,$ORACLE_SID等等变量都没有问题。

sqlplus / as sysdba

SQL> startup

ORA-01012: not logged on

反复试了好几次，都是这样。这是准生产环境，汗马上就下来了。

1.sqlplus / as sysdba

SQL*Plus: Release 11.2.0.2.0 Production on Mon Sep 23 19:44:01 2013

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

Connected. ---这个登录信息貌似也少了点什么，

2.单纯敲sqlplus，直接报了ORA-01089的错误。

 sqlplus

SQL*Plus: Release 11.2.0.2.0 Production on Mon Sep 23 19:44:30 2013

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

Enter user-name: system

Enter password: ERROR: ORA-01089: immediate shutdown in progress - no operations are permitted Process ID: 0 Session ID: 0 Serial number: 0

3.通过nolog方式登录，结果一startup就开始报错了。。。。

> sqlplus /nolog

SQL*Plus: Release 11.2.0.2.0 Production on Mon Sep 23 19:47:26 2013

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

SQL> conn / as sysdba

Connected to an idle instance.

SQL> startup ORA-01012: not logged on

4.最后再没办法了，只能startup force了。没想到这库一下子活过来了。

SQL> conn / as sysdba

Connected to an idle instance. SQL> startup force ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance ORACLE instance started.

Total System Global Area 4042100736 bytes

Fixed Size                  2232688 bytes Variable Size            1879051920 bytes Database Buffers         2147483648 bytes Redo Buffers               13332480 bytes Database mounted. Database opened. SQL> show parameter insta

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------ active_instance_count                integer cluster_database_instances           integer     1 instance_groups                      string instance_name                        string      XXXXX instance_number                      integer     0 instance_type                        string      RDBMS open_links_per_instance              integer     4 parallel_instance_group              string parallel_server_instances            integer     1 SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options

测试登录也正常，万幸万幸。

> sqlplus

SQL*Plus: Release 11.2.0.2.0 Production on Mon Sep 23 19:49:27 2013

Copyright (c) 1982, 2010, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> exit

----------------------------问题根源---------------------------

因为后续的操作，需要重启数据库，结果停了库之后，再启，竟然又出现了上面的情况

mos上说，

CAUSE

An orphaned shared memory segment belonging to the ORACLE_SID still exists from a previous instance startup.

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