1.执行opatch apply 报错 OPatch failed with error code 73  
[oracle@ora_11g 14275605]$ /opt/oracle/product/db_1/OPatch/opatch apply ./
Oracle Interim Patch Installer version 11.2.0.3.0
Copyright (c) 2012, Oracle Corporation. All rights reserved.
Oracle Home : /opt/oracle/product/db_1
Central Inventory : /opt/oraInventory
from : /opt/oracle/product/db_1/oraInst.loc
OPatch version : 11.2.0.3.0
OUI version : 11.2.0.3.0
Log file location : /opt/oracle/product/db_1/cfgtoollogs/opatch/opatch2012-12-18_21-45-13PM_1.log
Verifying environment and performing prerequisite checks...
Prerequisite check "CheckActiveFilesAndExecutables" failed.
The details are:
Following executables are active :
/opt/oracle/product/db_1/bin/oracle
Prerequisite check "CheckActiveFilesAndExecutables" failed.
The details are:
Following executables are active :
/opt/oracle/product/db_1/lib/libclntsh.so.11.1
UtilSession failed: Prerequisite check "CheckActiveFilesAndExecutables" failed.Prerequisite check "CheckActiveFilesAndExecutables" failed.
Log file location: /opt/oracle/product/db_1/cfgtoollogs/opatch/opatch2012-12-18_21-45-13PM_1.log
OPatch failed with error code 73
仔细查看报错提示“Check Active Files And Executables”可能是有些执行程序用到了
/opt/oracle/product/db_1/lib/目录下的库文件libclntsh.so.11.1
2.使用fuser查看
[oracle@ora_11g oinstall]$ /sbin/fuser /opt/oracle/product/db_1/lib/libclntsh.so.11.1
/opt/oracle/product/db_1/lib/libclntsh.so.11.1: 12831m
3.查看12831号进程,12831号进程为sqlplus 程序,应该就是sqlplus正在使用libclntsh.so.11.1库文件
[oracle@ora_11g oinstall]$ ps -ef | grep 12831
oracle 12831 6986 0 21:44 pts/3 00:00:00 sqlplus as sysdba
oracle 12832 12831 0 21:44 ? 00:00:00 oracletest01 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
oracle 12993 9126 0 21:47 pts/1 00:00:00 grep 12831
[oracle@ora_11g oinstall]$
4.杀掉12831进程,查看结果
[oracle@ora_11g oinstall]$ kill -9 12831
[oracle@ora_11g oinstall]$ ps -ef | grep 12831
oracle 13013 9126 0 21:55 pts/1 00:00:00 grep 12831
5.重新执行opatch 顺利执行完成

如有错误,欢迎指正