EXP-00010: %s is not a valid username
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*Action: Shut down the utility, then restart and retry with a valid
username.
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when i try backup my database this massege com up EXP-00010: BA is not a valid username
The exp command is an Oracle utilty which connects to the database.
As such, it will need a valid username. Apparently BA is not a valid username for the database you are connecting against
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