Monitoring Index without rows in v$object_usage !!!

Question

Hello Gurus,
OS - Solaris
Oracle - 92
I was generating a ddlscript to start monitoring index usage,
I've run the sql below :
@db92 > alter index INTRANET.PK_OWPDO MONITORING USAGE
2 ;
Index altered.
When I query the table V$OBJECT_USAGE i don't see anything when I should see
the
INDEX_NAME
TABLE_NAME
MONITORING YES
USED
START_MONITORING
END_MONITORING
@db92 > select * from V$OBJECT_USAGE ;
no rows selected
@db92 >
Does someone already got this issue before?
Thxs in advance

Answer 1

You should first use index:
SQL> CREATE INDEX job_idx ON emp(job);
Indeks zosta│ utworzony.
SQL> ALTER INDEX job_idx MONITORING USAGE;
Indeks zosta│ zmieniony.
SQL> SET AUTOTRACE ON;
SQL> SELECT ename, job FROM emp WHERE job = 'SALESMAN';
ENAME      JOB
ALLEN      SALESMAN
WARD       SALESMAN
MARTIN     SALESMAN
TURNER     SALESMAN
Plan wykonywania
Plan hash value: 3343541934
| Id  | Operation                   | Name    | Rows  | Bytes | Cost (%CPU)| Tim
e     |
|   0 | SELECT STATEMENT            |         |     3 |    42 |     2   (0)| 00:
00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| EMP     |     3 |    42 |     2   (0)| 00:
00:01 |
|*  2 |   INDEX RANGE SCAN          | JOB_IDX |     3 |       |     1   (0)| 00:
00:01 |
Predicate Information (identified by operation id):
   2 - access("JOB"='SALESMAN')
Statystyki
        241  recursive calls
          3  db block gets
         51  consistent gets
          0  physical reads
        536  redo size
        546  bytes sent via SQL*Net to client
        400  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          6  sorts (memory)
          0  sorts (disk)
          4  rows processed
SQL> SELECT index_name, monitoring, used, start_monitoring  FROM v$object_usage;
INDEX_NAME                     MON USE START_MONITORING
JOB_IDX                        YES YES 01/27/2009 10:07:25
SQL>