How Database chooses the proper Secondary index

Hello All,
Can any one tell me how database find the proper secondary index, in my case database is taking the wrong index leading to performance problem..
Please help
Regards.
Anmol

Hi Rob, Hi Herrman,
The Statistics are.
Last statistics date                  05/26/2008
Analyze Method              mple 16,671,728 Rows
Number of rows                        16,671,728
Number of blocks allocated             1,346,764
Number of empty blocks                     1,880
Average space                                983
Chain count                                    0
Average row length                           573
Partitioned                                   NO
NONUNIQUE Index   LTAP~Z01
Column Name                     #Distinct
MANDT                                          1
NLENR                                  5,361,981
VLENR                                  5,293,012
Last statistics date                    / /
Analyze Method                      Not analyzed
Levels of B-Tree                               0
Number of leaf blocks                          0
Number of distinct keys                        0
Average leaf blocks per key                    0
Average data blocks per key                    0
Clustering factor                              0
NONUNIQUE Index   LTAP~Z02
Column Name                     #Distinct
MANDT                                          1
LGNUM                                          6
VLTYP                                         29
VLPLA                                    464,011
PQUIT                                          2
Last statistics date                  05/26/2008
Analyze Method              mple 16,671,728 Rows
Levels of B-Tree                               3
Number of leaf blocks                    119,190
Number of distinct keys                  479,275
Average leaf blocks per key                    1
Average data blocks per key                   19
Clustering factor                      9,327,938
NONUNIQUE Index   LTAP~Z03
Column Name                     #Distinct
MANDT                                          1
LGNUM                                          6
NLTYP                                         30
NLPLA                                    338,815
PQUIT                                          2
Last statistics date                  05/26/2008
Analyze Method              mple 16,671,728 Rows
Levels of B-Tree                               3
Number of leaf blocks                    115,356
Number of distinct keys                  341,753
Average leaf blocks per key                    1
Average data blocks per key                   23
Clustering factor                      8,025,025

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How to revert back of secondary indexes created?

Hi all,
I have craeted secondary indexes in development and they have been transported into quality and production. Some dumps are coming in the production because of these secondary indexes.
Please guide me how to revert back those secondary indexes from production(means to keep original with out that secondary indexes?)
Please give me solution.
Regards,
Lokesh

Hello,
The best way to do this is delete the indexes again in DEV and create a transport request.
Transport this request to QA and PRD and the index will be deleted.
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Afterwards you can still use SE11 to delete the index from the SAP repository as well.
Success.
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i have a doubt while creating index for the table which is not having index. how to choose index on which column it will be beneficial ?
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I had to research on same topic. One of my teammates suggested few points that might help you also.
Advantages of partitioning:
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Message was edited by:
Abou

How to combine spatial and secondary index, when extracting?

Hi spatiallers,
vers.: (32 bit) Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production on Sun/SunOS 5.8 (64 bit)
In our DataWarehouse the table topo_geodata stores all topographic data in Denmark. The table has a spatial index (QT) on its SDO_geometry column named utm_geo as well as a primary key on the column topo_geo_id and 4 secondary indexes on other columns.
The query to find all geomtries in a given munipalicy is as follows
select count(*) as antal_AnyInteract_topo_geodata
from topo_geodata k, topo_geodata tg
where SDO_RELATE(tg.utm_geo, k.utm_geo, 'mask=AnyInteract querytype= WINDOW') = 'TRUE'
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and it returns a count of 19445 in 4 minuttes. However our users are only interested in extracting certain object types, that is a very small subselection of the 19445 geometries. The subselection is typically based on some value or a range of values in the secondary indexed columns.
Question: How can I make the SELECT use a combination of the spatial index index and a secondary index?
Only when a pinpoint 1 particular value of the primary key do I get fast response. When pinpointing 1 value in a secondary index as in
select count(*) as antal1
from topo_geodata k, topo_geodata tg
where SDO_RELATE(tg.utm_geo, k.utm_geo, 'mask=AnyInteract querytype= WINDOW') = 'TRUE'
and k.topo_geo_id = 961 -- Gladsaxe
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the performance deteriorates back to 4 min., and the queryplan shows some weird bitmap conversion followed by a bitmap-and operation.
- Thanks in advance,
Jens Ole Jensen
Kort & MatrikelStyrelsen (WWW: http://www.kms.dk)
Danmark

Hi Jens,
I'm not sure I understand the question, or what it is that works fast.
In this case, the SDO_RELATE with the anyinteract mask has to be done first.
If this takes 4 minutes, then adding additional criteria to reduce the amount of
data returned from that subset will only add time.
The spatial portion of the query has to be done using the spatial index, which is
a monolithic index for the whole table, so all of the geometry data has to be searched,
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After that set of rows comes back, then the additional predicate is applied.
I'm not sure what this means:
Only when a pinpoint 1 particular value of the primary key do I get fast response. You do have a few options to try to make things work faster:
If queries included additional predicates on mtk_obj_id, you might try
to use range partitioning.
If the predicates on mtk_obj_id is very selective, then you might want to select
values based on that column, then use sdo_geom.relate between that very
small subset and the query window.
Hope this helps, and all is well with you.
Dan

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Hi All,
I have to fetch the records from Database table using Index, how can i write the query using Index. Can any body plz send me the sample code.
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Hi,
See the below Example.
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Below is a question I posted in May along with someone's response. I'm wondering if I should still go with the response I received considering the new release of the mac pro 12 core. Did anything change that I need to note in my purchase or is the below response suitable? THANKS!!!!!
my question:
I need some help in choosing the right specs for my mac pro. I am looking for a computer that will help me in running my small business and keep my art portfolio organized. I'll probably be running several programs at a time (ex. mozilla, itunes, adobe bridge, dreamweaver, illustrator, and photoshop). More specifics below
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building a few websites
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Hello again washleyill,
The defining factor, which you haven't mentioned in either this or your original question, is what your overall budget is.
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best regard,
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Hi Mike,
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ATR

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