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By mistake i have open standby with just startup command.What will be the impact?Was it a readonly mode?Then again i put it in recovery mode it is receving archives and apllying.Yes, when you give a startup on the standby database, it opens in the READ ONLY mode. Once started, you'll have to start the MRP process (place the standby in recovery mode).
I strongly recommend that you have a look into the documentation:
Especially one thing is important in your situation to be aware of:
If you start Redo Apply while in Read Only mode, that requires an additional (extra charged) option called Active Data Guard
"Don't believe it, test it!"