IN operator query problem

Question

Hi,
when i give morethan 1000 cahtracters in the In squery it will give the error
Eg:
select * from table_name where field1 in ( ' 1,2,........');
is any solution for this
Thanks

Answer 1

Oracle will ignore the indexes ... if you are using OR operator.I'm not sure I agree. It is trivial to show Oracle can use index for... IN (a, b) OR IN (c, d) ...and has been able to for many versions e.g.
Oracle8i Enterprise Edition Release 8.1.7.3.0 - Production
With the Partitioning option
JServer Release 8.1.7.3.0 - Production
SQL> SET AUTOTRACE ON EXPLAIN;
SQL> SELECT id
  2  FROM   account
  3  WHERE  id IN ('1', '2')
  4     OR  id IN ('3', '4');
ID
1
2
4
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=6 Bytes=36)
   1    0   INLIST ITERATOR
   2    1     INDEX (RANGE SCAN) OF 'AC_ID' (NON-UNIQUE) (Cost=2 Card=6 Bytes=36)
SQL> It is of course possible that extended IN lists affect the calculation of selectivity on the column and bring into question whether it is more efficient to use the index.