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Will need more information.
OS and Version
Exact Oracle version
Any errors you find in your database alert logs
This ORA-01102 error indicates an instance tried to mount the database in exclusive mode, but some other instance has already mounted the database in exclusive or parallel mode.
I want configure data guard in same server thats why i created 2 instance using oradim but when i tried to mount standby instance it show me ORA-01102 error.even though I tried to open Primary database in parrallel mode.but standby database cannot be come in mount state.
os is windows 7 ultimate.
There's your problem.
Unsupported OS and version of Oracle in desupport.
You have a couple of options.
1. Run Oracle on a server OS using VMware or alike. You can run Oracle 11 on as little as 1.2GB of RMAN per virtual server and set different IP and such. It makes for a flexible, and cheap test area.
2. Just use a Server OS period.
Windows Ultimate is a workstation OS. Oracle and Data Guard need a server environment. Please consider this change.
I have my own techy rule regarding things like this. "Just because you can, does not mean you should".
Is Microsoft Windows 7 certified to install/run Oracle Database Server/Client ? [ID 952302.1]
Master Note For Database and Client Certification [ID 1298096.1]