Import dmp database with EE8MSWIN1250 to AL32UTF8 (XE)

Question

I have problem with importing dmp database with EE8MSWIN1250 to AL32UTF8 (XE)
I've tried to import my database dump with settings NLS_LANG=POLISH_POLAND.AL32UTF8 but it didn't work
I had
IMP-00019: row rejected due to ORACLE error 12899
IMP-00003: ORACLE error 12899 encountered
ORA-12899: value too large for column "MYDB"."AP_ARKUSZE_PRZECENY"."PRZEC_KOD" (actual: 26, maximum: 25)
Column 1 1
Column 2 Arkusz Średniowaťon\$NR$
Column 3 16-WRZ-2002:00:00:00
so I exported my database with NLS_LANG=POLISH_POLAND.AL32UTF8 and next I tried to import this dump but it still didn't work.
Anybody knows how to import dump database ??

Answer 1

It isn't correct approach. Column size is one of database constraints and you compromised it, so beware.
Correct approach is modifying columns to apply char length semantics, it means you should use following construct
alter table tablename modify columnname varchar2(10 CHAR)
In your code replace your execute immediate line with:
EXECUTE IMMEDIATE 'ALTER TABLE ' || tn || ' MODIFY ' || cn || ' VARCHAR2(' || crec.data_length || ' CHAR )';
Look at this example:
This is your original table
SQL>
SQL> create table T2( c varchar2(10 byte) );
Tabulka vytvořena.
SQL>
SQL> insert into T2 values ('0123456789');
1 řádka vytvořena.
SQL> insert into T2 values ('0123456789 few more');
insert into T2 values ('0123456789 few more')
CHYBA na řádku 1:
ORA-12899: value too large for column "MIGR"."T2"."C" (actual: 19, maximum: 10)
values longer then 10 characters are not allowed, it was your constraint, and now your modification
SQL>
SQL> alter table T2 modify c varchar2(20); -- 2*10
Tabulka změněna.
SQL> insert into T2 values ('+ěščřžýýáí');
1 řádka vytvořena.
You solved the problem, you shoud be praised
SQL> insert into T2 values ('0123456789 few more');
1 řádka vytvořena.
But, you compromised your data model
SQL>
SQL> rem correct approach
SQL>
SQL> delete from T2 where length(c)>10;
1 řádka vymazána.
This solve both problems, and constraint is still valid
SQL>
SQL> alter table T2 modify c varchar2(10 char);
Tabulka změněna.
SQL>
SQL> insert into T2 values ('+ěščřžýýáí');
1 řádka vytvořena.
SQL> insert into T2 values ('0123456789 few more');
insert into T2 values ('0123456789 few more')
CHYBA na řádku 1:
ORA-12899: value too large for column "MIGR"."T2"."C" (actual: 19, maximum: 10)