How to restrict the all access ? Single user mode....

I am doing export/import of schema objects from Windows to Oracle. How to make sure when I do the export in the migration database no one else is modifying the data. Is there any single user mode so that I can be sure of only one connection while exporting?
Oracle 10g R2 on Windows Server.
Thank you,
Smith

Perhaps you are not familiar with the concept of multi-version read consistency.
No one can see that which is not committed and reads can never be blocked.
If you want a system where no one can see things kill their sessions and do a STARTUP RESTRICT.

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<Edited by Host>

Thomas,
Thanks for the info on command-R, didn't know about that!!!
Yes I changed the sharing "Wheel Group" permissions on my hard drive via Get Info.    But that's all I did.    And then most of the apps wouldn't respond with anything.    So not knowing I did something stupid, I decided to re-boot, and then nothing but the Wheel of Death at startup.
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How to restrict the all access ? Single user mode....

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