Oracle 11g 安装完毕后，如果有卸载的需要。可以有如下方法：
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手工删除Oracle安装时建立的各目录、文件等。这种方法对于Linux还算可行，但是Window版中涉及到服务、注册表等等。往往删除不干净。
使用安装目录$ORACLE_HOME/deinstall/下的 deinstall脚本。
[oracle@localhost deinstall]$ ./deinstall Checking for required files and bootstrapping ... Please wait ... Location of logs /tmp/deinstall2015-08-22_00-06-37AM/logs/ ############ ORACLE DEINSTALL & DECONFIG TOOL START ############ ######################### CHECK OPERATION START ######################### ## [START] Install check configuration ## Checking for existence of the Oracle home location /u01/app/oracle/product/11.2.0/db_1 Oracle Home type selected for deinstall is: Oracle Single Instance Database Oracle Base selected for deinstall is: /u01/app/oracle Checking for existence of central inventory location /u01/app/oraInventory Checking for sufficient temp space availability on node(s) : 'localhost.localdomain' ## [END] Install check configuration ## Network Configuration check config START Network de-configuration trace file location: /tmp/deinstall2015-08-22_00-06-37AM/logs/netdc_check2015-08-22_12-06-57-AM.log Network Configuration check config END Database Check Configuration START Database de-configuration trace file location: /tmp/deinstall2015-08-22_00-06-37AM/logs/databasedc_check2015-08-22_12-07-12-AM.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 [orcl]: ###### For Database 'orcl' ###### Single Instance Database The diagnostic destination location of the database: /u01/app/oracle/diag/rdbms/orcl Storage type used by the Database: FS Database file location: /u01/app/oracle/oradata/orcl,/u01/app/oracle/fast_recovery_area/orcl Fast recovery area location: /u01/app/oracle/fast_recovery_area/ORCL database spfile location: /u01/app/oracle/product/11.2.0/db_1/dbs/spfileorcl.ora The details of database(s) orcl have been discovered automatically. Do you still want to modify the details of orcl database(s)? [n]: Database Check Configuration END Enterprise Manager Configuration Assistant START EMCA de-configuration trace file location: /tmp/deinstall2015-08-22_00-06-37AM/logs/emcadc_check2015-08-22_12-07-52-AM.log Checking configuration for database orcl Enterprise Manager Configuration Assistant END Oracle Configuration Manager check START OCM check log file location : /tmp/deinstall2015-08-22_00-06-37AM/logs//ocm_check446.log Oracle Configuration Manager check END ######################### CHECK OPERATION END ######################### ####################### CHECK OPERATION SUMMARY ####################### Oracle Home selected for deinstall is: /u01/app/oracle/product/11.2.0/db_1 Inventory Location where the Oracle home registered is: /u01/app/oraInventory The following databases were selected for de-configuration : orcl Database unique name : orcl Storage used : FS No Enterprise Manager configuration to be updated for any database(s) 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: '/tmp/deinstall2015-08-22_00-06-37AM/logs/deinstall_deconfig2015-08-22_12-06-51-AM.out' Any error messages from this session will be written to: '/tmp/deinstall2015-08-22_00-06-37AM/logs/deinstall_deconfig2015-08-22_12-06-51-AM.err' ######################## CLEAN OPERATION START ######################## Enterprise Manager Configuration Assistant START EMCA de-configuration trace file location: /tmp/deinstall2015-08-22_00-06-37AM/logs/emcadc_clean2015-08-22_12-07-52-AM.log 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: /tmp/deinstall2015-08-22_00-06-37AM/logs/databasedc_clean2015-08-22_12-08-27-AM.log Database Clean Configuration START orcl This operation may take few minutes. Database Clean Configuration END orcl Network Configuration clean config START Network de-configuration trace file location: /tmp/deinstall2015-08-22_00-06-37AM/logs/netdc_clean2015-08-22_12-09-31-AM.log 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 : /tmp/deinstall2015-08-22_00-06-37AM/logs//ocm_clean446.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/app/oracle/product/11.2.0/db_1' from the central inventory on the local node : Done Delete directory '/u01/app/oracle/product/11.2.0/db_1' on the local node : Done Delete directory '/u01/app/oraInventory' on the local node : Done Delete directory '/u01/app/oracle' on the local node : Done Oracle Universal Installer cleanup was successful. Oracle Universal Installer clean END ## [START] Oracle install clean ## Clean install operation removing temporary directory '/tmp/deinstall2015-08-22_00-06-37AM' on node 'localhost' ## [END] Oracle install clean ## ######################### CLEAN OPERATION END ######################### ####################### CLEAN OPERATION SUMMARY ####################### Successfully de-configured the following database instances : orcl 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/app/oracle/product/11.2.0/db_1' from the central inventory on the local node. Successfully deleted directory '/u01/app/oracle/product/11.2.0/db_1' on the local node. Successfully deleted directory '/u01/app/oraInventory' on the local node. Successfully deleted directory '/u01/app/oracle' on the local node. Oracle Universal Installer cleanup was successful. Run 'rm -rf /etc/oraInst.loc' as root on node(s) 'localhost' at the end of the session. Run 'rm -rf /opt/ORCLfmap' as root on node(s) 'localhost' at the end of the session. Run 'rm -rf /etc/oratab' as root on node(s) 'localhost' at the end of the session. Oracle deinstall tool successfully cleaned up temporary directories. ####################################################################### ############# ORACLE DEINSTALL & DECONFIG TOOL END #############
在删除的过程中有以下几点需要确认的
Specify the list of database names that are configured in this Oracle home [orcl]:
指定需要删除的数据库名称，默认即可，直接回车。
The details of database(s) orcl have been discovered automatically. Do you still want to modify the details of orcl database(s)? [n]:
是否需要修改数据库的详细信息，默认n，直接回车。
Do you want to continue (y - yes, n - no)? [n]: y
是否继续，填写y，回车
脚本结尾，提示需要使用root用户删除如下三个脚本。
rm -rf /etc/oraInst.loc rm -rf /opt/ORCLfmap rm -rf /etc/oratab
至此，Oracle删除完毕。
将Oracle软件再次安装
./runInstaller -silent -responseFile /home/oracle/etc/install_software_only.rsp
3. 使用专用工具
Oracle官方推荐使用专门的删除工具。原因是内置的deinstall工具脚本中常常带有很多bug，很多时候不能完全的将其删除干净。特别是Windows环境下的卸载工具，不能正常工作的场景很多。
上传工具包至服务器，直接解压，解压完毕后即可直接使用。
[oracle@localhost ~]$ unzip p13390677_112040_Linux-x86-64_7of7.zip
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