I want to insert two text files in to oracle.

Question

Ex :
text1.txt contains data as
1 a
2 b
3 c
text2.txt contains data as
4 d
5 e
6 f
I want to load both text file into oracle as
1 a 4 d
2 b 5 e
3 c 6 f
for these how to create *.ctl file*

Answer 1

I wouldn't use SQL*Loader for this.
Here's an example based on your simplified example, but it should get you going.
I used an external table, so you can load both files at the same time, by adding the filenames to the location.
By using the PIVOT technique, you can insert the data in the destination table as desired:
By the way: I needed some help for that last query:http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:4937250900346222596 ;)
SQL> drop table destination purge;
Table dropped.
SQL> drop table test purge;
Table dropped.
-- Create our desination table:
SQL> create table destination
  2  ( col1 varchar2(1)
  3  , col2 varchar2(1)
  4  , col3 varchar2(1)
  5  , col4 varchar2(1)
  6  );
Table created.
-- Instead of using SQL*Loader, we use an external table to query text1.txt and text2.txt at the same time:
SQL> create table test
  2  ( col1 varchar2(1)
  3  , col2 varchar2(1)
  4  )
  5  organization external
  6  ( type oracle_loader
  7    default directory DATA_PUMP_DIR
  8    access parameters ( records delimited by newline
  9                        fields terminated by ' '
10                        lrtrim
11                        missing field values are null
12                        ( col1 char(1)
13                        , col2 char(1)
14                        )
15                      )
16      location ('text1.txt'
17               ,'text2.txt'
18               )
19  );
Table created.
-- The data belonging to both files:
SQL> select * from test;
C C
1 a
2 b
3 c
4 d
5 e
6 f
6 rows selected.
-- Now just pivot as desired and insert with a single SQL statement:
SQL> insert into destination(col1, col2, col3, col4)
  2  select max(c1_1)
  3  ,      max(c2_1)
  4  ,      max(c1_2)
  5  ,      max(c2_2)
  6  from ( select decode( nt, 1, col1 ) c1_1
  7         ,      decode( nt, 1, col2 ) c2_1
  8         ,      decode( nt, 2, col1 ) c1_2
  9         ,      decode( nt, 2, col2 ) c2_2
10         ,      row_number() over (partition by nt order by col1) rn
11         from ( select col1
12                ,      col2
13                ,      ntile(2) over (order by col1) nt
14                from t
15              )
16       )
17  group by rn
18  order by rn;
3 rows created.
-- Look ma, we're already done!
SQL> select * from destination;
C C C C
1 a 4 d
2 b 5 e
3 c 6 f