To avoid duplicate rows in oracle 8i

Can you suggest how to prevent duplicate rows while in situations where multiple refreshes from a single export file using Oracle 8.1.7?
Do i need to specify Commit=Y, Constraints= N and IGNORE=N while importing data?
Your suggestion would be appreciated.
Thanks in advance.

PK or not pk, if you set ignore=n, the import will be abort in case of table already exists, so you won't have any duplicate rows.
SQL> create table mytable as select * from all_users union all select * from all_users;
Table created.
SQL> select count(*) from mytable;
COUNT(*)
        14
SQL> quit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> exp P97RPPRD/P97RPPRD tables=mytable log=test.log file=test.dmp
Export: Release 9.2.0.4.0 - Production on Tue Nov 14 13:32:40 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
Export done in UTF8 character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
. . exporting table                        MYTABLE         14 rows exported
Export terminated successfully without warnings.
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> sqlplus P97RPPRD/P97RPPRD
SQL*Plus: Release 9.2.0.4.0 - Production on Tue Nov 14 13:32:48 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
SQL> drop table mytable;
Table dropped.
SQL> quit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> imp P97RPPRD/P97RPPRD tables=mytable log=test.log file=test.dmp
Import: Release 9.2.0.4.0 - Production on Tue Nov 14 13:33:07 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
Export file created by EXPORT:V09.02.00 via conventional path
import done in UTF8 character set and AL16UTF16 NCHAR character set
. importing P97RPPRD's objects into P97RPPRD
. . importing table                      "MYTABLE"         14 rows imported
Import terminated successfully without warnings.
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> imp P97RPPRD/P97RPPRD tables=mytable log=test.log file=test.dmp
Import: Release 9.2.0.4.0 - Production on Tue Nov 14 13:33:46 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
Export file created by EXPORT:V09.02.00 via conventional path
import done in UTF8 character set and AL16UTF16 NCHAR character set
. importing P97RPPRD's objects into P97RPPRD
IMP-00015: following statement failed because the object already exists:
"CREATE TABLE "MYTABLE" ("USERNAME" VARCHAR2(30), "USER_ID" NUMBER, "CREATED"
"" DATE) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE(INITIAL 6553"
"6 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 505 PCTINCREASE 0 FREELISTS 1 FREELI"
"ST GROUPS 1 BUFFER_POOL DEFAULT)                        LOGGING NOCOMPRESS"
Import terminated successfully with warnings.
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> sqlplus P97RPPRD/P97RPPRD
SQL*Plus: Release 9.2.0.4.0 - Production on Tue Nov 14 13:34:13 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
SQL> select count(*) from mytable;
COUNT(*)
        14
SQL>Now, if you haven't pk and set ignore=y, you will have duplicate lines, for sure :
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> imp P97RPPRD/P97RPPRD tables=mytable log=test.log file=test.dmp ignore=y
Import: Release 9.2.0.4.0 - Production on Tue Nov 14 13:37:33 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
Export file created by EXPORT:V09.02.00 via conventional path
import done in UTF8 character set and AL16UTF16 NCHAR character set
. importing P97RPPRD's objects into P97RPPRD
. . importing table                      "MYTABLE"         14 rows imported
Import terminated successfully without warnings.
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> sqlplus P97RPPRD/P97RPPRD
SQL*Plus: Release 9.2.0.4.0 - Production on Tue Nov 14 13:37:57 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
SQL> select count(*) from mytable;
COUNT(*)
        28
SQL> Now, test with pk and ignore=y, import doesn't insert the duplicate key, so you won't have any duplicate rows :
SQL> drop table mytable;
Table dropped.
SQL> create table mytable as select * from all_users;
Table created.
SQL> alter table mytable add (primary key (username));
Table altered.
SQL> insert into mytable select * from all_users;
insert into mytable select * from all_users
ERROR at line 1:
ORA-00001: unique constraint (P97RPPRD.SYS_C001422815) violated
SQL> quit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> exp P97RPPRD/P97RPPRD tables=mytable log=test.log file=test.dmp
Export: Release 9.2.0.4.0 - Production on Tue Nov 14 13:41:39 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
Export done in UTF8 character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
. . exporting table                        MYTABLE          7 rows exported
Export terminated successfully without warnings.
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> imp P97RPPRD/P97RPPRD tables=mytable log=test.log file=test.dmp ignore=y
Import: Release 9.2.0.4.0 - Production on Tue Nov 14 13:41:49 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
Export file created by EXPORT:V09.02.00 via conventional path
import done in UTF8 character set and AL16UTF16 NCHAR character set
. importing P97RPPRD's objects into P97RPPRD
. . importing table                      "MYTABLE"
IMP-00019: row rejected due to ORACLE error 1
IMP-00003: ORACLE error 1 encountered
ORA-00001: unique constraint (P97RPPRD.SYS_C001422815) violated
Column 1 SYS
Column 2 0
Column 3 14-NOV-2005:16:14:52
IMP-00019: row rejected due to ORACLE error 1
IMP-00003: ORACLE error 1 encountered
ORA-00001: unique constraint (P97RPPRD.SYS_C001422815) violated
Column 1 SYSTEM
Column 2 5
Column 3 14-NOV-2005:16:14:52
IMP-00019: row rejected due to ORACLE error 1
IMP-00003: ORACLE error 1 encountered
ORA-00001: unique constraint (P97RPPRD.SYS_C001422815) violated
Column 1 OUTLN
Column 2 11
Column 3 14-NOV-2005:16:15:05
IMP-00019: row rejected due to ORACLE error 1
IMP-00003: ORACLE error 1 encountered
ORA-00001: unique constraint (P97RPPRD.SYS_C001422815) violated
Column 1 DBSNMP
Column 2 19
Column 3 14-NOV-2005:16:24:23
IMP-00019: row rejected due to ORACLE error 1
IMP-00003: ORACLE error 1 encountered
ORA-00001: unique constraint (P97RPPRD.SYS_C001422815) violated
Column 1 PS
Column 2 21
Column 3 14-NOV-2005:16:36:41
IMP-00019: row rejected due to ORACLE error 1
IMP-00003: ORACLE error 1 encountered
ORA-00001: unique constraint (P97RPPRD.SYS_C001422815) violated
Column 1 P97RPPRD
Column 2 24
Column 3 14-NOV-2005:16:53:41
IMP-00019: row rejected due to ORACLE error 1
IMP-00003: ORACLE error 1 encountered
ORA-00001: unique constraint (P97RPPRD.SYS_C001422815) violated
Column 1 PEOPLE
Column 2 25
Column 3 14-NOV-2005:16:57:09          0 rows imported
Import terminated successfully with warnings.
[data/ora/adm/DBA_ORACLE i05c09 : oracle : P97RPPRD ]> HTH,
Nicolas.

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I want to write the query to find the duplicate rows in the table.
SELECT ITEM, MFT_ITEM, MFT, DESC FROM ITEM
In the item table,if MFT_ITEM is coming more than or equal to twice ,it is a duplicate rows.MFT_ITEM is a unique.
ITEM    MFT_ITEM   MFT              DESC
4647 4648 C6253 TOOLS
4647 4648 A0237 TOOLS
10PS 10PS A0027 KITS
10PS 11PS A0028 COVER
12LN 12LN A0034 NUTS
12LN 12LN A0035 NUTS
12LN 13LN A0036 SCREW
4310 4311 00462 POWER
4310 4311 31645 POWER
4310 4311 81205 POWER
I want the results like
ITEM    MFT_ITEM   MFT              DESC
4647 4648 C6253 TOOLS
4647 4648 A0237 TOOLS
12LN 12LN A0034 NUTS
12LN 12LN A0035 NUTS
4310 4311 00462 POWER
4310 4311 31645 POWER
4310 4311 81205 POWER
Please reply

Nicole Thanks for your advise,
I try the below query , I am getting 0 rows.
With t As
Select 4647 ITEM,4648 MFG_ITEM, 'C6253' MFG ,'Tools' Descrip From dual Union All
Select 4647 ,4648 , 'A0237' ,'Tools' From dual Union All
Select 1088 ,1088 , 'A0027' ,'Kits' From dual Union All
Select 1088 ,1188 , 'A0028' ,'Covers' From dual Union All
Select 1245 ,1245 , 'A0034' ,'Nuts' From dual Union All
Select 1245 ,1245 , 'A0035' ,'Nuts' From dual Union All
Select 1245 ,1345 , 'A0036' ,'Screw' From dual Union All
Select 4310 ,4313 , 'A0046' ,'Power' From dual Union All
Select 4310 ,4313 , 'A3164' ,'Power' From dual Union All
Select 4310 ,4313 , 'A0462' ,'Power' From dual
)Select ITEM, MFG_ITEM,MFG,DESCRIP From
Select ITEM, MFG_ITEM,MFG,DESCRIP,
Count(MFG_ITEM) over (Partition By ITEM Order By ITEM) cnt
From t
) Where cnt > 1;
I should get the results like below
ITEM     MFG_ITEM     MFG     DESCRIP
4647     4648     C6253     Tools
4647     4648     A0237     Tools
1245     1245     A0034     Nuts
1245     1245     A0035     Nuts
4310     4313     A0046     Power
4310     4313     A3164     Power
4310     4313     A0462     Power
Please reply

To avoid duplicate rows in oracle 8i

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