Oracle XE 11gR2 beta has just been released, some details here and download here. It’s not a great deal of use for sandboxing DWH-specific stuff, given this list of excluded functionality (and this is by no means everything that’s not included):
- Bitmapped index, bitmapped join index, and bitmap plan conversions
- Oracle Partitioning
- Parallel Data Pump Export/Import
- Parallel query/DML
- Parallel Statement Queuing
(source)
However, it’s always interesting to have to hand for trying out other things. And I like playing with new toys 
On running the installer, I hit this problem:
"OracleXEService should not be installed already"
[...]
Checking for Oracle XE Service instance…:
Expected result : OracleXEService should not be installed already.
Actual result: OracleServiceXE found on system.
Check complete: The overall result of this check is failed.
The previous owner of the machine had installed Oracle XE 10, but I’d removed this:
No Oracle XE 10g listed in add/remove programs
Or so I thought:
OracleServiceXE still listed in Services
To remove the service entry, use the sc command:
sc delete OracleServiceXE
For good measure I did the same for OracleJobSchedulerXE.
Delete service entries using sc
After this, installation proceeded as normal.
Thank you! This was driving me nuts. I am glad someone smarter than me knew how to fix it.
Comment by Mark — July 2, 2011 @ 02:39
It’s kind of obvious that Oracle doesn’t ship the full product with all the options as free software.
They do need to make a living.
Comment by Richard Martens — July 29, 2011 @ 13:52
I’m not sure what your point is?
It’s useful to know the difference in versions, and I’m just listing some of the pertinent ones to my area of work.
I wasn’t suggesting that these features should be included.
Comment by rnm1978 — August 1, 2011 @ 13:33
Robin,
I’m sorry I misunderstood.
I think I might be in need for a course “English”
Regards,
Richard
Comment by rhjmartens — August 1, 2011 @ 13:56
No problem
Comment by rnm1978 — August 4, 2011 @ 09:05
I also faced the same problem where existing pc already had oracle 10g EX installed. Follow yr step to delete the services and reinstall. It works. Thank you
Comment by Glo — September 28, 2011 @ 07:11
Thank you , I get this issue , and I do follow your post . it is fixed
Comment by dzung — October 4, 2011 @ 08:57
Thanks guys for ur help
Comment by Praveen Dabas — October 7, 2011 @ 12:18
[...] Oracle XE 11gR2 installation – “OracleXEService should not be installed already” [...]
Pingback by Instalando mais de uma versão do Oracle XE no seu computador - Dimensão Tech — February 16, 2012 @ 11:31
thank u very much this information very useful to me
Comment by krishna — May 19, 2012 @ 19:05
Wow cool it works like champs Many thanks to rnm1978
Comment by Jags — May 21, 2012 @ 20:47