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Finding out Oracle Version and Uninstalling Oracle – some notes for the new oracle dba

here is for oracle client:

while installation, pick client option.

There are several ways where you can query or retrieve the version number of installed Oracle products:

1. If you just want to check the version information of the Oracle database, simply connect and login to the Oracle database with SQL *Plus. Upon login, you will see:

SQL*Plus: Release – Production on Tue Oct 18 17:58:57 2005

Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.

Connected to:
Oracle9i Enterprise Edition Release – 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release – Production

The first italic number is the version of the SQL*Plus client and the second italic number is the version of Oracle database which you are connected to .

2. Retrieve the version information from v$version table by using SQL*Plus. In this table you can find version information on Oracle, PL/SQL, etc.

To retrieve the version information for Oracle, you execute the following SQL statement:

select * from v$version where banner like ‘Oracle%’;

It should return something like this:

Oracle9i Enterprise Edition Release – 64bit Production

3. Version information can also be checked from Installed Products from the Oracle Universal Installer. It will tells you what products is installed on the machine and also its version information too.

In Unix, the installer is located at $ORACLE_HOME/bin/runInstaller.
In Windows, access the installer by Start -> All Programs -> Oracle Installed Products -> Universal Installer.

–on windows server to put terminal server in install

Change user /INSTALL

–the version is

There are a few choices to make on how much stuff you want to install, if this is not self-explaining feel free to ask here.
If in doubt I’d start with the option using the least disk space, you can always come back and install mor things.
Make sure the client is at least the version of the server software,
newer clients can access older servers, the other way round can cause problems.
To configure the network connection to the server (this is the hard part, if any) you will nedd to have some info about the server (SID, network (host) name, …). Ask the DBA of the server.

–for uninstalling existing version
It has detailed instructions for the inistallation process.

Manual Oracle Uninstall

A number of people have contacted me regarding problems uninstalling Oracle products. The two methods listed below should only be used as a last resort and will remove all Oracle software allowing a reinstall. If you make any mistakes they can be quite destructive so be careful.


In the past I’ve had many problems uninstalling all Oracle products from Windows systems. Here’s my last resort method:

  • Uninstall all Oracle components using the Oracle Universal Installer (OUI).
  • Run regedit.exe and delete the HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE key. This contains registry entires for all Oracle products.
  • Delete any references to Oracle services left behind in the following part of the registry:
    It should be pretty obvious which ones relate to Oracle.
  • Reboot your machine.
  • Delete the "C:\Oracle" directory, or whatever directory is your ORACLE_BASE.
  • Delete the "C:\Program Files\Oracle" directory.
  • Empty the contents of your "c:\temp" directory.
  • Empty your recycle bin.

At this point your machine will be as clean of Oracle components as it can be without a complete OS reinstall.

Remember, manually editing your registry can be very destructive and force an OS reinstall so only do it as a last resort.


Uninstalling all products from UNIX is a lot more consistent. If you do need to resort to a manual uninstall you should do something like:

  • Uninstall all Oracle components using the Oracle Universal Installer (OUI).
  • Stop any outstanding processes using the appropriate utilities:
·                # oemctl stop oms user/password
·                # agentctl stop
# lsnrctl stop

Alternatively you can kill them using the kill -9 pid command as the root user.

  • Delete the files and directories below the $ORACLE_HOME:
·                # cd $ORACLE_HOME
# rm -Rf *
  • With the exception of the product directory, delete directories below the $ORACLE_BASE.
·                # cd $ORACLE_BASE
# rm -Rf admin doc jre o*
  • Delete the /etc/oratab file. If using 9iAS delete the /etc/emtab file also.
# rm /etc/oratab /etc/emtab


System.Data.OracleClient requires Oracle client software version 8.1.7 or greater.

When usign System.Data.OracleClient with Oracle9i client, i got the following message while connecting to the Oracle database from and ASP.NET application.

System.Data.OracleClient requires Oracle client software version 8.1.7 or greater.
Security permissions were not properly set when the Oracle 9i Release 2 client was installed on Windows with NTFS. The result of this is that content of the ORACLE_HOME directory is not visible to Authenticated Users on the machine; this again causes an error while the System.Data.OracleClient is communicating with the Oracle Connectivity software from an ASP.NET using Authenticated User privileges.

To fix the problem you have to give the Authenticated Users group privilege to the Oracle Home directory.

  • Log on to Windwos as a user with Administrator privileges.
  • Start Window Explorer and navigate to the ORACLE_HOME folder.
  • Choose properties on the ORACLE_HOME folder.
  • Click the “Security” tab of the “Properties” window.
  • Click on “Authenticated Users” item in the “Name” list.
  • Uncheck the “Read and Execute” box in the “Permissions” list under the “Allow” column.
  • Re-check the “Read and Execute” box under the “Allow” column
  • Click the “Advanced” button and in the “Permission Entries” verify that “Authenticated Users” are listed with permission = “Read & Execute”, and Apply To = “This folder, subfolders and files”. If not, edit that line and make sure that “Apply To” drop-down box is set to “This folder, subfolders and files”. This should already be set properly but it is important that you verify it.
  • Click the “Ok” button until you close out all of the security properties windows. The cursor may present the hour glass for a few seconds as it applies the permissions you just changed to all subfolders and files.
  • Reboot, to assure that the changes have taken effect.

Try your application again.

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