Secondary Index Picked with one field short in select query

Hi,
We have a select query as follows
select single lgort       vgbel        vgpos
    into   (lips-lgort,lips-vgbel,lips-vgpos)
    from    lips
   where         vbeln          Eq p_zlcpp-vbeln
     and         matnr          Eq p_zlcpp-matnr
     and         charg          Eq p_zlcpp-charg
The secondary index ZB has the fields as follows:
MANDT     Client
MATNR     Material Number
CHARG     Batch Number
BWART     Movement Type (Inventory Management)
When seen in the trace it seems the select query picks this secondary index. Whether it is correct? since i find no BWART in the select query. Because of this index the query take large time. I used the Hint statement as follows:
select single lgort       vgbel        vgpos
    into   (lips-lgort,lips-vgbel,lips-vgpos)
    from    lips
   where         vbeln          Eq p_zlcpp-vbeln
     and         matnr          Eq p_zlcpp-matnr
     and         charg          Eq p_zlcpp-charg   %_HINTS ORACLE 'INDEX("LIPS" "LIPS~0")' .
and it now works fast. Please advice the best way to make the select query work on itself without using the hint statement to pick the index LIPS~0 instead of the invalid secondary index ZB.
Thanks & Regards,
Selvakumar M.
Edited by: Selva on Jun 17, 2011 7:35 PM

Hello Selva,
your problem here is the decision of the optimizer that does not exactly know the selectivity of the fields.
If your deliveries are normally small (not too many items), then selecting via the document number will be relatively fast.
And selecting via the material number + batch will be slow in case if many deliveries are having same product from the same batch delivered.
I assume that the latest is the case in your system. That's why the selection with ZB index is slow.
If the data distribution is as I described above, then your hint is quite OK and I advise you to stick to the hint.
From my PoV this is the better solution rather changing the coding and throwing out MATNR field from the WHERE clause to filter later in ABAP.
Another solution would be trying to play with histograms. But you'll need %SUBSTITUTE VALUES% or %SUBSTITUTE LITERALS% hint anyway, so I find your solution better.
So, please stay with hint. Even SAP standard development does it for some select statements.
Regards,
Yuri

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Hi chinmay kulkarni,
its better if you can ask concerned person to add MANDT field in your index as well....
Indexes and MANDT
If a table begins with the mandt field, so should its indexes. If a table begins with mandt and an index doesn't, the optimizer might not use the index.
Remember, if you will, Open SQL's automatic client handling feature. When select * from ztxlfa1 where land1 = 'US' is executed, the actual SQL sent to the database is select * from ztxlfa1 where mandt = sy-mandt and land1 = 'US'. Sy-mandt contains the current logon client. When you select rows from a table using Open SQL, the system automatically adds sy-mandt to the where clause, which causes only those rows pertaining to the current logon client to be found.
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http://www.sap-img.com/abap/quick-note-on-design-of-secondary-database-indexes-and-logical-databases.htm
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