ORA-00001: Unique constraint (...) violated
You are importing duplicate rows. Use IGNORE=YES to skip tables that already exist (imp will give an error if the object is re-created).
ORA-01555: Snapshot too old
Ask your users to STOP working while you are exporting or try using parameter CONSISTENT=NO
ORA-01562: Failed to extend rollback segment
Create bigger rollback segments or set parameter COMMIT=Y while importing
IMP-00015: Statement failed ... object already exists...
Use the IGNORE=Y import parameter to ignore these errors, but be careful as you might end up with duplicate rows.
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