请教打PATCH事项

true_life

现在的版本是:SOLARIS9+9.2.0.1.0
因做了STANDBY,在OPEN READ ONLY时候出现了错误如下:
ORA-00604: error occurred at recursive SQL level 1
ORA-16000: database open for read-only access
Error 604 happened during db open, shutting down database
USER: terminating instance due to error 604
Instance terminated by USER, pid = 20204
ORA-1092 signalled during: alter database open read only...
认为是BUG所至,故下载了p3501955_9205_SOLARIS64.zip
打算升级到9205
以前从没有打过PATCH,请问各位打过的前辈,我该备份哪些文件
打PATCH有哪些注意事项,步骤是怎样的,谢谢!: