The last step of upgrading with the tool in ArcGis Desktop has succeeded .
After I create an SDE service: OK but I can't start it "Error starting esri_sde service (1053) Could not start ArcSDE -- Check Network, $SDEHOME disk, DBMS settings end dbinit.sde"
I checked the SDEHOME, dbinit.sde :ok
ArcSde and ORacle 11g are on the same server (Windows server 2008) with ArcGisServer 10.
How did you create the sde service? It might be worth double-checking the C:\Windows\System32\drivers\etc\services file to make sure it has the correct name and port of your arcsde service...
You have upgraded your geodatabase but did you also upgrade the ArcSDE service installation? The binary files may still be at version 9.3 but your geodatabase is at version 10.0.