Yesterday to Anhui Susong a customer there to maintain the experience and lessons

                 Yesterday to Anhui Susong a customer to do maintenance experience and lessons

      customer's database server would have been good, and I was trying to show someone how to install Oracle's clients. Oracle client installed on the server, half of the time I suddenly felt I found a great error: Oracle server can no longer install Oracle client,
I quit but late: fee management system can not connect to the database, PB can not connect to the database, DBA Studio also cannot connect to the database.
Oh, my god ... It's going to be a big problem. Data is not backed up. Customers can't surf the internet.
      I had a cold sweat and wanted to call my manager right away, and I happened to call the manager and I told him. He tried to keep his cool (and then he said he was in a cold sweat): I said how many times: Oracle server can no longer install Oracle client, if the customer's arrears data lost, I Shang, you have to do a good job of the database to come back, Oracle's client installation process modifies the contents of the registry, and you need a control to change it back. I was ordered to act at once.
     refer to the Oracle registry information on my machine and modify it according to the customer's machine, and then put the registry into the customer's registry. It is only by resignation that the service is valued. It works after the heavy lifting. Oh, my God.

The experience was a real lesson, and this time it was a good luck to recover. The big lesson: whatever you do in the future,
Backup your database!!!!
Make sure to back up ....

Below is the information that I use the registry:
Windows Registry Editor Version 5.00

[Hkey_local_machine/software/oracle]
"Inst_loc" = "C://program files//oracle//inventory"
"Oracle_home" = "c://oracle//ora81"
"Oracle_home_name" = "OraHome81"
"API" = "C://oracle//ora81//dbs"
"Oracle_group_name" = "oracle-orahome81"
"Nls_lang" = "American_america." We8iso8859p1 "
"OLE DB" = "C://ORACLE//ORA81//OLEDB//MESG"
"VOBHOME2.0" = "c://oracle//ora81"
"Oo4o" = "C://ORACLE//ORA81//OO4O//MESG"

[Hkey_local_machine/software/oracle/all_homes]
"Home_counter" = "1"
"Default_home" = "OraHome81"
"Last_home" = "0"

[HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE/ALL_HOMES/ID0]
"NAME" = "OraHome81"
"PATH" = "c://oracle//ora81"
"Nls_lang" = "American_america." We8iso8859p1 "

[HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE/HOME0]
"ID" = "0"
"Oracle_group_name" = "oracle-orahome81"
"Oracle_home_name" = "OraHome81"
"Oracle_home" = "c://oracle//ora81"
"Nls_lang" = "American_america." We8iso8859p1 "
"Oracle_sid" = "ybstd99"
"Oracle_home_key" = "SOFTWARE//ORACLE//HOME0"
"SQLPath" = "C://oracle//ora81//dbs"
"Oracle_base" = "c://oracle"
"Mshelp_tools" = "C://oracle//ora81//mshelp"
"Rdbms_control" = "C://oracle//ora81//database"
"Rdbms_archive" = "c://oracle//ora81//database//archive"
"Ora_waterh_autostart" =hex (2): 54,00,52,00,55,00,45,00,00,00
"Ora_waterh_pfile" =hex (2): 43,00,3a,00,5c,00,6f,00,72,00,61,00,63,00,6c,00,65,/
00,5c,00,61,00,64,00,6d,00,69,00,6e,00,5c,00,77,00,61,00,74,00,65,00,72,00,/
68,00,5c,00,70,00,66,00,69,00,6c,00,65,00,5c,00,69,00,6e,00,69,00,74,00,2e,/
00,6f,00,72,00,61,00,00,00
"Ora_waterh_shutdown" =hex (2): 54,00,52,00,55,00,45,00,00,00
"Ora_waterh_shutdowntype" =hex (2): 69,00,00,00
"Ora_waterh_shutdown_timeout" =hex (2): 33,00,30,00,00,00

[Hkey_local_machine/software/oracle/oledb]
"CacheType" = "Memory"
"Chunksize" = "100"
"DISTRIBTX" = "1"
"Fetchsize" = "100"
"Osauthent" = "0"
"Plsqlrset" = "0"
"Pwdchgdlg" = "1"
"SCHRSTLNG" = "10000"
"USERDEFFN" = "0"
"Disableretclause" = "1"
"Tracecategory" = "0"
"TraceFileName" = "C://ORAOLEDB.TRC"
"TraceLevel" = "0"
"Traceoption" = "0"

[Hkey_local_machine/software/oracle/oo4o]
"Cacheblocks" = "20"
"Fetchlimit" = "100"
"Fetchsize" = "4096"
"HelpFile" = "C://oracle//ora81//mshelp//oracleo.hlp"
"Perblock" = "16"
"Slicesize" = "256"
"Tempfiledirectory" = "c://temp"
"Oo4o_home" = "c://oracle//ora81//oo4o"