通常情況下，Oracle數據庫安裝之後是不會輕易的刪除的。但是當我們進行日常實驗或者軟件故障問題調整時，是需要進行Database Server或者Client刪除的。
刪除Oracle軟件（主要是$ORACLE_HOME目錄下內容）主要有兩種方式，一種是使用內置在Oracle安裝目錄下的deinstall工具腳本。其調用路徑分別爲：
$ORACLE_HOME/deinstall/deinstall (unix platforms)
%ORACLE_HOME%\deinstall\deinstall.bat (windows platforms)
另一種方法是使用專門的deinstall工具進行刪除操作。該工具在Oracle官方網站上可以單獨的下載。
這兩種方式上，Oracle官方推薦的做法是使用後者，也就是專門的刪除工具。原因是內置的deinstall工具腳本中常常帶有很多bug，很多時候不能完全的將其刪除乾淨。特別是Windows環境下的卸載工具，不能正常工作的場景很多。
本篇就來一步步的介紹使用deinstall卸載方法。
1、 環境介紹
首先看看我們的實驗環境，是Linux 4下的Oracle11g。其中配置了完整的安裝路徑變量。
--環境變量信息
[oracle@oracle11g~]$ env | grep ORA
ORACLE_SID=wilson
ORACLE_BASE=/u01
ORACLE_HOME=/u01/oracle
首先，使用lsnrctl stop命令，將監聽程序停止工作。使用status參數進行確認。
--檢驗監聽器狀態
[oracle@oracle11g~]$ lsnrctl status
LSNRCTL for Linux: Version11.2.0.1.0 - Production on 18-NOV-2011 22:46:52
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle11g)(PORT=1521)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
Linux Error: 111: Connection refused
關閉數據庫服務器。
[oracle@oracle11g~]$ sqlplus /nolog
SQL*Plus: Release11.2.0.1.0 Production on Fri Nov 18 22:47:02 2011
Copyright (c) 1982, 2009, Oracle. All rights reserved.
SQL> conn / as sysdba
Connected.
SQL>shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
確定oracle相關進程全部停止。
[oracle@oracle11g~]$ ps -ef | grep ora
root 5572 5540 0 22:43 pts/0 00:00:00 su - oracle
oracle 5573 5572 0 22:43 pts/0 00:00:00 -bash
oracle 5775 5573 0 22:47 pts/0 00:00:00 ps -ef
oracle 5776 5573 0 22:47 pts/0 00:00:00 grep ora
2、上傳和解壓deinstall程序
使用FTP客戶端，將下載的內容上傳到Linux目錄上。
[oracle@oracle11gtest]$ ls -l
total 111264
-rw-r--r-- 1 root root 113811593 Nov 18 22:56 linux_11203_deinstall.zip
使用unzip進行解壓文件。
[oracle@oracle11gtest]$ unzip linux_11203_deinstall.zip
Archive: linux_11203_deinstall.zip
creating: deinstall/
inflating: deinstall/deinstall.pl
creating: deinstall/sysman/
creating: deinstall/sysman/admin/
inflating: deinstall/sysman/admin/supportedtzs.lst
inflating: deinstall/sysman/admin/nsupportedtzs.lst
creating: deinstall/sysman/admin/dtds/
inflating: deinstall/sysman/admin/dtds/tagsize.properties
creating: deinstall/sysman/admin/scripts/
（篇幅原因，有省略……）
進入deinstall目錄。使用deinstall是不需要額外的安裝過程的。
[oracle@oracle11gtest]$ ls -l
total 111268
drwxr-xr-x 20 oracle oinstall 4096 Sep 22 14:24 deinstall
-rw-r--r-- 1 root root 113811593 Nov 18 22:56 linux_11203_deinstall.zip
[oracle@oracle11gdeinstall]$ ls
assistants cv deinstall.xml lib perl sshUserSetup.sh
bin dc_ocm diagnostics logs readme.txt sysman
bootstrap.pl deinstall jlib mapfiles response usm
crs deinstall.pl jre oui srvm utl
3、調用腳本語句
調用語句，刪除指定的$ORACLE_HOME。
--指定刪除的$ORACLE_HOME
[oracle@oracle11gdeinstall]$./deinstall -home /u01/oracle
Location of logs /test/deinstall/./logs/
############ ORACLE DEINSTALL & DECONFIG TOOL START ############
######################### CHECK OPERATION START #########################
## [START] Install check configuration ##
Checking for existence of the Oracle home location /u01/oracle
Oracle Home type selected for deinstall is: Oracle Single Instance Database
Oracle Base selected for deinstall is: /u01
Checking for existence of central inventory location /u01/oraInventory
Checking for sufficient temp space availability on node(s) : 'oracle11g'
## [END] Install check configuration ##
在腳本運行中，會有若干的確認點，確認刪除的對象、監聽器的名稱等信息。通常都會有默認值。
Network Configuration check config START
Network de-configuration trace file location: /test/deinstall/./logs/netdc_check2011-11-18_10-59-36-PM.log
Specify all Single Instance listeners that are to be de-configured[LISTENER]:（監聽器名稱）
Network Configuration check config END
Database Check Configuration START
Database de-configuration trace file location: /test/deinstall/./logs/databasedc_check2011-11-18_10-59-49-PM.log
Use comma as separator when specifying list of values as input
Specify the list of database names that are configured in this Oracle home[wilson]: （數據庫名稱）
###### For Database 'wilson' ######
Single Instance Database
The diagnostic destination location of the database: /u01/diag/rdbms/wilson
Storage type used by the Database: FS
Database file location: /u01/oradata/WILSON,/u01/flash_recovery_area/WILSON/controlfile
Fast recovery area location: /u01/flash_recovery_area/WILSON
database spfile location: /u01/oracle/dbs/spfilewilson.ora
The details of database(s)wilsonhave been discovered automatically. Do you still want to modify the details ofwilsondatabase(s)?[n]: （確認刪除）
Database Check Configuration END
Enterprise Manager Configuration Assistant START
EMCA de-configuration trace file location: /test/deinstall/./logs/emcadc_check2011-11-18_11-00-21-PM.log
Checking configuration for databasewilson
Enterprise Manager Configuration Assistant END
Oracle Configuration Manager check START
OCM check log file location : /test/deinstall/./logs//ocm_check_2011-11-18_11-00-22-PM.log
Oracle Configuration Manager check END
######################### CHECK OPERATION END #########################
####################### CHECK OPERATION SUMMARY #######################
Oracle Home selected for deinstall is: /u01/oracle
Inventory Location where the Oracle home registered is: /u01/oraInventory
Following Single Instance listener(s) will be de-configured: LISTENER
The following databases were selected for de-configuration :wilson
Database unique name :wilson
Storage used : FS
Will update the Enterprise Manager configuration for the following database(s):wilson
No Enterprise Manager ASM targets to update
No Enterprise Manager listener targets to migrate
Checking the config status for CCR
Oracle Home exists with CCR directory, but CCR is not configured
CCR check is finished
Do you want to continue (y - yes, n - no)?[n]: y
A log of this session will be written to: '/test/deinstall/./logs/deinstall_deconfig2011-11-18_10-59-33-PM.out'
Any error messages from this session will be written to: '/test/deinstall/./logs/deinstall_deconfig2011-11-18_10-59-33-PM.err'
######################## CLEAN OPERATION START ########################
Enterprise Manager Configuration Assistant START
EMCA de-configuration trace file location: /test/deinstall/./logs/emcadc_clean2011-11-18_11-00-21-PM.log
Updating Enterprise Manager Database Control configuration for databasewilson
Updating Enterprise Manager ASM targets (if any)
Updating Enterprise Manager listener targets (if any)
Enterprise Manager Configuration Assistant END
Database de-configuration trace file location: /test/deinstall/./logs/databasedc_clean2011-11-18_11-00-42-PM.log
Database Clean Configuration STARTwilson
This operation may take few minutes.
Database Clean Configuration ENDwilson
Network Configuration clean config START
Network de-configuration trace file location: /test/deinstall/./logs/netdc_clean2011-11-18_11-01-58-PM.log
De-configuring Single Instance listener(s): LISTENER
De-configuring listener: LISTENER
Stopping listener: LISTENER
Warning: Failed to stop listener. Listener may not be running.
Deleting listener: LISTENER
Listener deleted successfully.
Listener de-configured successfully.
De-configuring Naming Methods configuration file...
Naming Methods configuration file de-configured successfully.
De-configuring backup files...
Backup files de-configured successfully.
The network configuration has been cleaned up successfully.
Network Configuration clean config END
Oracle Configuration Manager clean START
OCM clean log file location : /test/deinstall/./logs//ocm_clean_2011-11-18_11-00-22-PM.log
Oracle Configuration Manager clean END
Setting the force flag to false
Setting the force flag to cleanup the Oracle Base
Oracle Universal Installer clean START
Detach Oracle home '/u01/oracle' from the central inventory on the local node : Done
Delete directory '/u01/oracle' on the local node : Done
Delete directory '/u01/oraInventory' on the local node : Done
The Oracle Base directory '/u01' will not be removed on local node. The directory is not empty.
Oracle Universal Installer cleanup was successful.
Oracle Universal Installer clean END
## [START] Oracle install clean ##
Clean install operation removing temporary directory '/tmp/deinstall2011-11-18_10-59-33PM' on node 'oracle11g'
## [END] Oracle install clean ##
######################### CLEAN OPERATION END #########################
####################### CLEAN OPERATION SUMMARY #######################
Updated Enterprise Manager configuration for databasewilson
Successfully de-configured the following database instances :wilson
Following Single Instance listener(s) were de-configured successfully: LISTENER
Cleaning the config for CCR
As CCR is not configured, so skipping the cleaning of CCR configuration
CCR clean is finished
Successfully detached Oracle home '/u01/oracle' from the central inventory on the local node.
Successfully deleted directory '/u01/oracle' on the local node.
Successfully deleted directory '/u01/oraInventory' on the local node.
Oracle Universal Installer cleanup was successful.
（提示的額外刪除語句）
Run 'rm -rf /etc/oraInst.loc' as root on node(s) 'oracle11g' at the end of the session.
Run 'rm -rf /opt/ORCLfmap' as root on node(s) 'oracle11g' at the end of the session.
Oracle deinstall tool successfully cleaned up temporary directories.
#######################################################################
############# ORACLE DEINSTALL & DECONFIG TOOL END #############
之後，根據提示內容刪除剩餘文件。確認$ORACLE_HOME刪除。
[oracle@oracle11gdeinstall]$ env | grep ORA
ORACLE_SID=wilson
ORACLE_BASE=/u01
ORACLE_HOME=/u01/oracle
[oracle@oracle11gu01]$ ls
testscript
4、結論
刪除數據庫是一種非經常性場景，但是預先準備，可以做到有備無患。