Index info dubt

Question

Hi all.
Can someone explain to me why the following results are always different ?
I tryed this on several database and results are never the same, what I somehow expect to be.
Anyway, please see:
select count(*) from dba_objects where object_type='INDEX'40654
select count(*) from dba_indexes41782
..this selects always gave me different results, no mather on what database i executed them, so was wondering why? ... and what select shows correct number

Answer 1

Indexes in question are LOB indexes:
{color:#3366ff} 1 select distinct index_type from
2 dba_indexes ind
3 where not exists (select 1 from dba_objects o
4 where o.object_name=ind.index_name and
5 o.owner=ind.owner and
6* o.object_type='INDEX')
SQL> /
SQL> /
INDEX_TYPE
{color}-----
{color:#3366ff} LOB
{color}Verification can also be achieved with a different method:
{color:#3366ff} SQL> select count(*) from dba_indexes;
COUNT(*)
*3972*
Elapsed: 00:00:00.10
SQL> select count(*) from dba_objects where object_type='INDEX';
COUNT(*)
*3214*
Elapsed: 00:00:00.24
SQL> select count(*) from dba_objects where object_type='LOB';
COUNT(*)
*758*
Elapsed: 00:00:00.23
SQL> select 3214+758 from dual;
3214+758
*3972*
Elapsed: 00:00:00.00{color}
Potentially, there is another possible source of mismatch:
{color:#3366ff}
1 select distinct segment_type from dba_segments
2 where (owner,segment_name) in
3 (select owner,index_name from dba_indexes
4 minus
5* select owner,object_name from dba_objects where object_type='INDEX')
SQL> /
SEGMENT_TYPE
LOBINDEX
INDEX PARTITION
{color:#000000}The conclusion is that there is a terminology problem. Lob indexes are considered "indexes" but I am not sure why. One
cannot manipulate them or change their parameters.
{color}{color}