这篇文章不是标题党，是在实际工作中真切的案例。
场景：这是一套Windows Server 2008 R2 X64的系统，跑了一套10.2.0.5.0的oracle物理备库，运行一切正常。在客户的要求下，需要调整该服务器的机器名。
步骤：整理好调整的思路后，开始执行操作[包括停备库，ASM实例，修改hosts文件、tnsnames.ora文件等]，在客户IT人员修改完机器名并重启服务器之后，发现悲剧的一幕，机器无法正常启动，不过客户端倒是可以ping通服务器，但是无法通过远程桌面连接。
怎么办呢？经过分析和定位，感觉极有可能出问题的地方就是OracleCSService这个服务，而且该服务的启动类型是自动启动。也就是说该服务项会加载到windows系统的启动项里，随着操作系统的启动而启动，而该服务又是hard-coded,应该是同机器名进行“捆绑”的，由于修改了机器名，导致OracleCSService服务项不能正常启动，进而导致操作系统无法正常启动。
找到解决问题的思路之后，可以尝试重启服务器，进入安全模式，禁用该服务，然后重启机器，结果该机器已经无法再次进入安全模式，之前进去过，原因未知，客户IT硬件人员操作。
于是，一边尝试可以进入安全模式的方法，一边估计下下策的重装Windows系统，重建Dataguard的方案。结果，更为不可思议的是，服务器特么自己能够正常启动了，大家什么都没操作。接下来，就登录上去，果断重建了OracleCSService服务：
删除该服务：
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Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.
All
rights reserved.
C:\Users\Administrator>C:\oracle\product\10.2.0\db_1\BIN\localconfig.bat
usage: crssetup <config
add
=
""
deconfig=
""
del=
""
help=
""
ladd=
""
ldel=
""
lres=
""
shutdown=
""
upgrade=
""
>
config - configure
and
startup the cluster
on
nodes
add
-
add
specified nodes
to
the cluster
del -
delete
the specified nodes
from
the cluster
deconfig - wipe
out
all
cluster configuration information
ldel -
local
css
delete
from
oracle home
lres -
local
css home reset
to
new oracle home
ladd -
local
css
add
to
oracle home
shutdown - shutdown the selected nodes
upgrade - upgrade the specified nodes
help - print
out
this information
C:\Users\Administrator>C:\oracle\product\10.2.0\db_1\BIN\localconfig.bat deconfig
GetConfiguredClusterNodes: failed
to
initialize subsystem, rc(21)
failed
to
determine remaining nodes
in
the cluster
failed during critical configuration information
please supply <-
force
>
option
to
continue
C:\Users\Administrator>C:\oracle\product\10.2.0\db_1\BIN\localconfig.bat deconfig -
force
GetConfiguredClusterNodes: failed
to
initialize subsystem, rc(21)
failed
to
determine remaining nodes
in
the cluster
failed during critical configuration information
<-
force
>
option
specified, continuing
Step 1: shutting down node apps
failed executing
check
for
CRS resources
[ 2 ] The system cannot find the file specified.
failed executing
check
for
CRS resources
failure determining CRS resources state, continuing due
to
FORCE
option
DEBRESTDDB Removing node apps
PRKC-1056 : Failed
to
get the hostname
for
node DEBRESTDDB
PRKH-1010 : Unable
to
communicate
with
CRS services.
[Communications Error(Native: prsr_initCLSS:[3])]
DEBRESTDDB Removing ONS configuration
failed
to
remove ONS configuration
[ 2 ] The system cannot find the file specified.
DEBRESTDDB failed
to
execute
removal
of
ONS configuration
failuring during
delete
of
node apps, continuing
Step 2: shutting down
local
CRS stack
DEBRESTDDB failed
to
located service OracleEVMService, err(1060)
failed
to
stop CRS stack
on
all
nodes
to
be removed, continuing
Step 3: removing CRS stack
from
requested nodes
Step 4: stopping extra CRS services
Step 5: cleanup up registry keys
Step 6: perform cleanup
of
the OCR repository C:\oracle\product\10.2.0\db_1\cdata\localhost\
local
.ocr
successful deconfiguration
of
the cluster
C:\Users\Administrator></config>
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重建该服务：
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C:\Users\Administrator>C:\oracle\product\10.2.0\db_1\BIN\localconfig.bat
add
Step 1: creating new OCR repository
Successfully accumulated necessary OCR keys.
Creating OCR keys
for
user
'administrator'
, privgrp
''
..
Operation successful.
Step 2: creating new CSS service
successfully created
local
CSS service
successfully added CSS
to
home
C:\Users\Administrator>
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最后，启动ASM实例，启动物理备库，打开同主库的同步，完成同步。
值得记住的地方：
① 不要轻易修改机器名，除非必要。修改之前，一定一定要理清楚checklist，不可像本例中遗漏了OracleCSService服务项的重建；
② 对于生产环境的各种操作，真的要三思而后行；
③ 写这篇记录小文的时候，发现Metalink上有该案例的详细操作说明哇：How to change the Hostname when Oracle 10G and ASM are used [ID 422729.1]