Very SLOW IOT secondary indexes performance ORACLE 9i

Hi all,
Is it TRUE that in ORACLE 9i version secondary IOT table indexes are
extremely slow?
I created IOT table of 250 million rows with no OWERFLOW segment
I created secondary index, altered it updating its block references
Now i have that it takes about 12 minutes to get rows using that index on IOT table
And it takes about 14 seconds in regular heap-table using the same index
Is it of the same opera that Oracle states: that secondary indexes on IOT table
are similar to regular indexes on performance. but in reality they are significantly slower?
Does anyone had such situation?
What can be done to speed up access?
Thanks for answers.

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>
sonia agarwal wrote:
> Dear Sir,
>
> In our Production System , MIRO trabsaction is running very slow .
> Kindly guide us as what steps need to be followed to trace/analyze the reason for slow MIRO transaction .
>
> As the reason of the problem can be that some of the SQL might be running very slow or some Index related issue .
>
> We need to undersatnd the steps to be followed to know the cause of the problem .
>
> Pl help us .
>
>
> Rgds
>
> Sonia
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orton607 wrote:
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As you have more data in the table I guess you have set the Lazy Load to Yes.
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     LU_LOAN_ACCOUNT     a12,
     LU_LOAN_PROD     a13
where     a11.BRANCH_ID = a12.BRANCH_ID and
     a11.LOAN_ACCOUNT_ID = a12.LOAN_ACCOUNT_ID and
     a11.LOAN_PRODUCT_ID = a13.LOAN_PROD_ID
and     (a11.MONTH_ID in ('201010')
and a11.LOAN_PRODUCT_ID not in ('A1','A2','A3')
and a11.LOAN_STATUS_ID in ('A', 'B', 'C', 'D'))
group by     a13.LOAN_BASICCD_ID,
     a11.BRANCH_ID,
     a11.PAYMENT_ID
explain plan
STATEMENT_ID     TIMESTAMP     REMARKS     OPERATION     OPTIONS     OBJECT_NODE     OBJECT_OWNER     OBJECT_NAME     OBJECT_INSTANCE     OBJECT_TYPE     OPTIMIZER     SEARCH_COLUMNS     ID     PARENT_ID     POSITION     COST     CARDINALITY     BYTES     OTHER_TAG     PARTITION_START     PARTITION_STOP     PARTITION_ID     OTHER     DISTRIBUTION
     12-NOV-10          SELECT STATEMENT                                   CHOOSE          0          307     307     1     83
     12-NOV-10          SORT     GROUP BY                                        1     0     1     307     1     83
     12-NOV-10          NESTED LOOPS                                             2     1     1     302     1     83
     12-NOV-10          NESTED LOOPS                                             3     2     1     301     1     50
     12-NOV-10          MERGE JOIN     CARTESIAN                                        4     3     1     4     1     11
     12-NOV-10          TABLE ACCESS     FULL          DWH     LU_LOAN_PROD     3                    5     4     1     2     1     10
     12-NOV-10          BUFFER     SORT                                        6     4     2     2     3     3
     12-NOV-10          INDEX     FULL SCAN          DWH     SYS_C00972          UNIQUE     ANALYZED          7     6     1     1     3     3
     12-NOV-10          INLIST ITERATOR                                             8     3     2
     12-NOV-10          TABLE ACCESS     BY INDEX ROWID          DWH     FT_LOAN_PORTFOLIO     1          ANALYZED          9     8     1     298     74095     2889705
     12-NOV-10          INDEX     RANGE SCAN          DWH     IDX_FT_LOAN_PORTFOLIO          NON-UNIQUE     ANALYZED     3     10     9     1     14     1950               2     2     10
     12-NOV-10          TABLE ACCESS     BY INDEX ROWID          DWH     LU_LOAN_ACCOUNT     4          ANALYZED          11     2     2     2     3273283     108018339
     12-NOV-10          INDEX     UNIQUE SCAN          DWH     PK_LU_LOAN_ACCOUNT          UNIQUE          1     12     11     1          1                                   Edited by: 814228 on Nov 22, 2010 3:21 AM

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