因個人的誤操作造成的嚴重問題，記錄在此，警鐘長鳴！

SQL*Plus: Release 11.2.0.4.0 Production on Tue Mar 15 14:30:05 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Enter user-name: /as sysdba


Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options


SQL> 
SQL> show parameter name


NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
cell_offloadgroup_name               string
db_file_name_convert                 string
db_name                              string      orcl
db_unique_name                       string      orcl
global_names                         boolean     FALSE
instance_name                        string      orcl
lock_name_space                      string
log_file_name_convert                string
processor_group_name                 string
service_names                        string      orcl
SQL> 
SQL> 
SQL> shu


^CORA-01013: user requested cancel of current operation


SQL> 
SQL> 
SQL> show parameter group


NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
asm_diskgroups                       string
asm_preferred_read_failure_groups    string
cell_offloadgroup_name               string
instance_groups                      string
parallel_instance_group              string
processor_group_name                 string
SQL> 
SQL> 
SQL> 
SQL> @?/rdbms/admin/awrrpti.sql


Specify the Report Type
~~~~~~~~~~~~~~~~~~~~~~~
Would you like an HTML report, or a plain text report?
Enter 'html' for an HTML report, or 'text' for plain text
Defaults to 'html'
Enter value for report_type: 


Type Specified:  html




Instances in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


   DB Id     Inst Num DB Name      Instance     Host
------------ -------- ------------ ------------ ------------
* 1391143806        1 ORCL         orcl         dcerp-orcl


Enter value for dbid: 
Using  for database Id
Enter value for inst_num: 
Using  for instance number
  :dbid      :=  ;
                 *
ERROR at line 2:
ORA-06550: line 2, column 18:
PLS-00103: Encountered the symbol ";" when expecting one of the following:
( - + case mod new not null <an identifier>
<a double-quoted delimited-identifier> <a bind variable>
continue avg count current exists max min prior sql stddev
sum variance execute forall merge time timestamp interval
date <a string literal with character set specification>
<a number> <a single-quoted SQL string> pipe
<an alternatively-quoted string literal with character set specification>
<an alternatively




declare
*
ERROR at line 1:
ORA-20200: Database/Instance / does not exist in DBA_HIST_DATABASE_INSTANCE
ORA-06512: at line 23




Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[

[email protected] ~]$ 
[[email protected] ~]$ 
[[email protected] ~]$ sqlplus


SQL*Plus: Release 11.2.0.4.0 Production on Tue Mar 15 14:31:00 2016


Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Enter user-name: /as sydba^H^H^H
SP2-0306: Invalid option.
Usage: CONN[ECT] [{logon|/|proxy} [AS {SYSDBA|SYSOPER|SYSASM}] [edition=value]]
where <logon> ::= <username>[/<password>][@<connect_identifier>]
      <proxy> ::= <proxyuser>[<username>][/<password>][@<connect_identifier>]
Enter user-name: /as sysdba
Connected.
SQL> 
SQL> 
SQL> 
SQL> 
SQL> show parameter name
ORA-01012: not logged on
Process ID: 0

Session ID: 0 Serial number: 0

在sqlplus命令列裡 輸入 shu 回車

SQL> shu


^CORA-01013: user requested cancel of current operation

檢視alert

導致normal模式

然後startup  force

出現

SQL>startup ORA-00845: MEMORY_TARGET not supported on this system

解決

修改 /dev/shm 大小

mount -t tmpfs shmfs -o size=10g /dev/shm