Bitmap Index Not Used in PROD and used in DEV

I am in a situation where in in DEV Bitmap Index is used and in PROD bitmap Index is not used. I checked the count, in PROD I have 10 mil rows and in DEV I have 16 mil rows. Optimizer is CHOOSE and also when I tried to force to use index in PROD, I got higher cost.
Any suggestions why Index is not used in PROD as opposed to DEV

As other says, no guarantee that the same query with same setting OS, ORACLE to produce the same execution plan. Also, as Justin said, dont every take cost as your tuning parameter, pay attention to response time, also, number of logical reads and physical reads. What are the wait events during?
For an index, most important factors are, blevel, clustering_factor, number of distinct values. Clustering actor make a lot of difference. You said, when you force index to use, your performance has gained. If so, why not, why the HINTS there in place? Go ahed and use it, but, after all the R&D. Are the Optimizer* paraemters same on the both databases?
If possible, post the execution plan of the query, with HINT and without HINT as well.
Jaffar

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<quote>I clearly tell optimizer to use the bitmap index</quote>
You are clearly not doing it right (see bellow). But anyway
1. For frequently modified tables (OLTP type application) you may want to rethink the applicability of bitmap indexes
low cardinality in itself is not enough justification for using bitmap indexes.
2. Your update statement may modify a minority, a majority, or anything in between of the total number of
rows in your table here is no one universal access method which is always better
(if there were one they wouldnt have bothered with coding the rest).
In short, index access is not always the better way.
3. Dont rush into hinting (because that optimizer is such a lousy piece of software)
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flip@FLOP> create table t as select * from all_objects;
Table created.
flip@FLOP> insert into t select * from t;
30043 rows created.
flip@FLOP> insert into t select * from t;
60086 rows created.
flip@FLOP> insert into t select * from t;
120172 rows created.
flip@FLOP> insert into t select * from t;
240344 rows created.
flip@FLOP> create bitmap index tx on t (object_type);
Index created.
flip@FLOP> exec dbms_stats.gather_table_stats(user,'T',method_opt=>'for all indexed columns',cascade=>true)
PL/SQL procedure successfully completed.
flip@FLOP> select object_type,count(*) from t group by rollup(object_type);
OBJECT_TYPE          COUNT(*)
CONSUMER GROUP             32
DIRECTORY                  32
EVALUATION CONTEXT         16
FUNCTION                 1648
INDEX                   23152
INDEX PARTITION          2048
INDEXTYPE                 128
JAVA CLASS             163024
JAVA RESOURCE            3120
LIBRARY                   224
LOB                        16
MATERIALIZED VIEW          32
OPERATOR                  464
PACKAGE                  5488
PACKAGE BODY               32
PROCEDURE                 640
SEQUENCE                  144
SYNONYM                202512
TABLE                   18816
TABLE PARTITION           880
TRIGGER                  4768
TYPE                    10640
TYPE BODY                  16
VIEW                    42816
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update few rows CBO goes with the index no hinting
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Elapsed: 00:00:09.02
Execution Plan
   0      UPDATE STATEMENT Optimizer=CHOOSE (Cost=536 Card=47488 Bytes
          =1044736)
   1    0   UPDATE OF 'T'
   2    1     INLIST ITERATOR
   3    2       BITMAP CONVERSION (TO ROWIDS)
   4    3         BITMAP INDEX (SINGLE VALUE) OF 'TX'
update lots of rows CBO goes with the ft no hinting
flip@FLOP> update t d set object_id=object_id-1 where object_type in ('JAVA CLASS','SYNONYM');
365536 rows updated.
Elapsed: 00:00:25.04
Execution Plan
   0      UPDATE STATEMENT Optimizer=CHOOSE (Cost=638 Card=365536 Byte
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   1    0   UPDATE OF 'T'
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365536 rows updated.
Elapsed: 00:00:21.00
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   1    0   UPDATE OF 'T'
   2    1     TABLE ACCESS (FULL) OF 'T' (Cost=638 Card=365536 Bytes=8
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365536 rows updated.
Elapsed: 00:00:25.01
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   1    0   UPDATE OF 'T'
   2    1     INLIST ITERATOR
   3    2       BITMAP CONVERSION (TO ROWIDS)
   4    3         BITMAP INDEX (SINGLE VALUE) OF 'TX'
flip@FLOP>

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