I truncate table with error and disable all constraints on this table
after I exported this table:
exp tom/tom@oradb file=tb.dmp tables=ER

after I imported this table:
imp system/manager@oradb file=tb.dmp fromuser=tom touser=sam ignore=y

but I get same previous error:

IMP-00019:row rejected due oracle error 1401
IMP-00003racle error 1401 encountered
ORA-1401:inserted value too large for column
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Why
Raf