Why validateitem trigger ? why not use post textitem trigger

hi
my self : I used when-validate-item for the amount field in the form to chek that it should be > 0;
other: why using when-validate-item trigger only, i can use to place same code in Post-text-item or Post-field triggers ?
myself : when-validate-item triggers generally used for checking business rules. Other tiggers are used for other purpose.
other: is it compulsory to use when-validate-item to chek for business rule voilation
my self: no answer.
please can any body suggest me what would be my answer in the above debate ?
thanks in advance
prasanth as.

WHEN-VALIDATE-ITEM fires only if the value was changed (ITEM_IS_VALID = FALSE), well POST-TEXT-ITEM fires in all cases

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Why is this query not using the index?

check out this query:-
SELECT CUST_PO_NUMBER, HEADER_ID, ORDER_TYPE, PO_DATE
FROM TABLE1
WHERE STATUS = 'N'
and here's the explain plan:-
1
2     -------------------------------------------------------------------------------------
3     | Id | Operation | Name | Rows | Bytes | Cost (%CPU)|
4     -------------------------------------------------------------------------------------
5     | 0 | SELECT STATEMENT | | 2735K| 140M| 81036 (2)|
6     |* 1 | TABLE ACCESS FULL| TABLE1 | 2735K| 140M| 81036 (2)|
7     -------------------------------------------------------------------------------------
8
9     Predicate Information (identified by operation id):
10     ---------------------------------------------------
11
12     1 - filter("STATUS"='N')
There is already an index on this column, as is shown below:-
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1     TABLE1_IDX2 NORMAL     NONUNIQUE     TABLE1      STATUS     1
2     TABLE1_IDX NORMAL     NONUNIQUE     TABLE1     HEADER_ID     1
So why is this query not using the index on the 'STATUS' Column?
I've already tried using optimizer hints and regathering the stats on the table, but the execution plan still remains the same, i.e. it still uses a FTS.
I have tried this command also:-
exec dbms_stats.gather_table_stats('GECS','GEPS_CS_SALES_ORDER_HEADER',method_opt=>'for all indexed columns size auto',cascade=>true,degree=>4);
inspite of this, the query is still using a full table scan.
The table has around 55 Lakh records, across 60 columns. And because of the FTS, the query is taking a long time to execute. How do i make it use the index?
Please help.
Edited by: user10047779 on Mar 16, 2010 6:55 AM

If the cardinality is really as skewed as that, you may want to look at putting a histogram on the column (sounds like it would be in order, and that you don't have one).
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Message was edited by: Frankda4

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Why is this query not using my index ?

hey
i have the following situation
(i'm sorry but i can't add the acctual script or output)
create table x as
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from     dual
connect by level < 100001;
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so, why isn't he using my index ?

It's using that index for me:
SQL> create table x as
2 select level high_card ,
3 mod(level,1000) medium_card ,
4 mod(level,10) low_card ,
5 '***' padding
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SQL>
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SQL>
SQL> create index x_high_ix on x(high_card);
Index created.
SQL>
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size auto');
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SQL> ed
Wrote file afiedt.buf
1   select *
2   from x
3   where low_card = 70
4   and medium_card = 70
5* and high_card = 70
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SQL> /
no rows selected
Execution Plan
Plan hash value: 775193209
| Id | Operation                   | Name      | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |           |     1 |    15 |     2   (0)| 00:00:01 |
|* 1 | TABLE ACCESS BY INDEX ROWID| X         |     1 |    15 |     2   (0)| 00:00:01 |
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        370 bytes received via SQL*Net from client
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PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Productionwhat is your version?
By the way, when i force optimizer to use index X_MED_LOW_IX, it does 2 CR for me.

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Why validateitem trigger ? why not use post textitem trigger

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