Dave,
Thanks for the good article. I am trying for two separate instances on the
same box, 8i and 9i. I am not installing anything just adding 9i.
Thanks
Rick
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ORACLE-L <[EMAIL PROTECTED]>
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[EMAIL PROTECTED] Subject: Re: ORA-27101 "Shared
Memory Realm Does Not Exist"
04/29/2002 05:31 PM
Please respond to
ORACLE-L
Rick,
Are you trying for two seperate versions of Oracle on the box, or did you
remove the 8.1.6 to install 9i? If you did the latter, I'm afraid your
uninstall did not go properly and your service isn't pointing to the right
place. Oradim is the "supported" method for removing (renaming?) an Oracle
instance, but here's some tips I got when I was new to the NT/2000 world
from "Novice DBA". I've sent this before, but you should take a look at
your registry settings, they're probably the key to your problem and this
document will help you know what to look for:
Database Installation involves a set of procedures which need to be
followed
in order to have a proper working installation. If we follow these
procedures the Installation will be fine and usually problems related to
improper installation do not arise. But it is not always possible to get a
proper installation for the first time. This document is a troubleshooting
guide which would help to clear off the mess created by an improper
installation in a WindowsNT system.
First we need to know that During installation Oracle writes into certain
directories (which we would have specified during installation) and also
into the WindowsNT registry. WindowsNT registry is a repository of
information about all the installed products and configurations on that
system. When we are installing Oracle a directory is created in the
registry
which is name oracle which is present in the HKEY_LOCAL_MACHINE/SOFTWARE/
In the case of an improper installation the problems faced are
· We may not be able to uninstall the incomplete installation
· We may succeed in uninstalling the incomplete installation but yet face
problems with WindowsNT Services.
· Every time we log into WindowsNT we may get an error 'at least one system
service failed to start' which may be an Oracle service from the earlier
installation.
· We may get an error while creating a database 'the database with the name
you specified already exists please chose another name' which again may be
attributed to an improper un-installation.(I am not pretty comfortable
with
the Oracle's Un-installation utility because I feel it does not uninstall
everything)
Keeping the above points in mind it would be better if we know where
exactly
to look in case we are faced with such problems. When oracle is installed
it
makes entries in the following places
1. The first and the foremost- the directory in which we install the Oracle
database (say D:\Ora8i)
2. The second is the inventory it maintains in the directory c:\program
files\oracle
3. The third HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE in the registry
4. The other place is HKEY_LOCAL_MACHINE/SYSTEM . Inside this entry there
are three nodes controlset1,controlset2 and currentcontrolset. These nodes
in turn have 4 nodes out of which 2 are important to us. They are Enum and
Services. The Enum node has got two nodes out of which the 'root' node is
of
great interest to us because it stores details about all the services that
are running on a WindowsNT system. The other node of interest from the
controlsets is Services. The services node has got a list of services
running on a WindowsNT system.
In case we need to clean up the system after an incomplete installation we
can follow the following steps
Delete the home directory where Oracle is installed
Delete the folder C:\program files\oracle Note:- This clears off
information
about any other Oracle utility installed on that system.
Delete the registry entry HKEY_LOCAL_MACHINE/SOFTWARE/ORACLE Warning:- This
clears off information about any other Oracle utility installed on that
system and you may not be able to run those programs again.
Delete the Oracle Related services from
HKEY_LOCAL_MACHINE/SYSTEM/CONTROLSETx/ENUM/ROOT/ . They will be named with
a
prefix LEGACY_ORACLE... Note:- You will have to use regedt32.exe to invoke
registry editor and not regedit. You will have to use the security menu and
give permissions to yourself before deleting these entries. Else it will
not
work . It is to be noted that there are three control sets and all the
three
(in reality any 2) need to be cleared off these un-necessary entries.
Delete the Oracle Related services from
HKEY_LOCAL_MACHINE/SYSTEM/CONTROLSETx/SERVICES . They will have a prefix
'Oracle'.
Hope this helps.
David A. Barbour
Oracle DBA, OCP
AISD
512-414-1002
Rick_Cale@team
health.com To: Multiple recipients of
list ORACLE-L <[EMAIL PROTECTED]>
Sent by: cc:
[EMAIL PROTECTED] Subject: ORA-27101 "Shared
Memory Realm Does Not Exist"
om
04/29/2002
03:43 PM
Please respond
to ORACLE-L
I just installed Oracle 9i on a WinNT 4 server. It already had 8.1.6. I
installed Oracle 9 into a different home. The service/instance starts.
When I try to connect via sqlplus / to create a database I get ORA-27101
"Shared Memory Realm Does Not Exist" . I have the oracle_sid
set correctly. Any ideas as I have tried all I know but still get the same
error.
Thanks
Rick
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