Which Index is better?

Hi ,
Can u let me know which index on fact table is better for query performance. Is it bit map or bit tree? Also , how to change the type of index on the fact table.
Thanks.

Hallo Apurva
The standard BW index are BIT MAP Index. In case you have high cardinality in the dimension than you can flag it in the dimensiona and the sytem create B-tree index.
http://help.sap.com/saphelp_nw04/helpdata/en/e3/e60138fede083de10000009b38f8cf/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/80/1a6473e07211d2acb80000e829fbfe/frameset.htm
Mike

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Which solution for better perfomance?

I'm writing java application based on XML. This application have to store very large XML file into DB (XML file is about 1000MB large). My solution is to divide it into smaller (100MB) parts (because of memory resources) and store it in DB. I have one XMLType table based on object-relational storage (so at the end there will be 10 rows each of 100MB size).
XML file looks like:
<students>
<student id="1">
...// 5 nested elements or collections of elements
</student>
<student id="2">
</student>
<student id="3">
</student>
</students>
</students>
Now I need to get java object Student which correponds to <student>element. My solution is to select whole <student> element and use JAXB to convert it to Java object. While solving a problem with selecting <student> element (just in case you know a solution for my another problem: How to select specific element from a XML document using JDBC? another question raised in my mind.
Which solution has better performance when I don't need to select relational data but I'm interested in xml fragment?
1) Use object-relational storage
2) Use CLOB storage
As I figured out object-relational storage is better for selecting data like student name. But is it also better when I need whole xml fragment?
Isn't my solution completely wrong? I'm quite a newbie in XML DB so it's possible that I missed better solution.
Thanks for any advice

I don't know which version you have regarding 11g, but probably in this case I would go for a table with a XMLType Binary XML column. To make xpath and other statements perform use Structured or Unstructured XMLIndexes to support your queries. The following has worked for far smaller XML documents but the millions we used were good for a total of >> 1 TB total storage size...
CREATE TABLE XMLTEST_DATA
(    "ID" NUMBER(15,0),
      "DOC" "SYS"."XMLTYPE"
) SEGMENT CREATION IMMEDIATE
NOCOMPRESS NOLOGGING
TABLESPACE "XML_DATA"
XMLTYPE COLUMN "DOC" STORE AS SECUREFILE BINARY XML
(TABLESPACE "XML_DATA"
NOCOMPRESS KEEP_DUPLICATES)
-- XMLSCHEMA "http://www.XMLTEST.com/Schema1.0.xsd"
-- ELEMENT "RECORD"
DISALLOW NONSCHEMA
PARTITION BY RANGE(id)
(PARTITION XMLTEST_DATA_PART_01 VALUES LESS THAN (100000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_02 VALUES LESS THAN (200000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_03 VALUES LESS THAN (300000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_04 VALUES LESS THAN (400000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_05 VALUES LESS THAN (500000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_06 VALUES LESS THAN (600000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_07 VALUES LESS THAN (700000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_08 VALUES LESS THAN (800000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_09 VALUES LESS THAN (900000000) TABLESPACE "XML_DATA" NOCOMPRESS
,PARTITION XMLTEST_DATA_PART_MAX VALUES LESS THAN (MAXVALUE) TABLESPACE "XML_DATA" NOCOMPRESS
CREATE INDEX test_xmlindex on XMLTEST_data (doc) indextype is xdb.xmlindex
LOCAL
parameters ('GROUP PARENTINFO_GROUP
             XMLTable test_cnt_tab_ParentInfo
            ''/RECORD/ParentInfo''
            COLUMNS
             GroupingID01 VARCHAR2(4000) PATH ''Parent/GroupingID'',
             GroupingID02 VARCHAR2(4000) PATH ''Parent/Parent/GroupingID''
          ');

Which index will it take and why ?

Hi,
I have a table Employee and i have an index on EmpID on this table. Now i have created a view EmpView on this table. I have created an index on this view for the same column EmpID.
Now my question is If i query select * from Empview where empId = something then which index will it consider and why??
Thanks in advance
Balaji
Balaji - BI Developer

Good day Balaji
Prasad
1. How long it took you to write the question in the forum?
You are asking about specific case in your database. I am sure that you could open click on the Execution Plan button and get a faster answer and much more accurate for your specific database. Not always the forum is the best and faster solution, sometimes
you can get it yourself.
Regarding the "why", it is a good question :-)
please post DDL+DML
2. As other mentioned if you want help regarding a query then we need to be able to reproduce the situation. Instead of stories on your tables, you could post the DDL+DML queries :-) that mean the create table (with indexes) query and the insert sample
data query. With this information we can click the Execution Plan button in our server :-)
Moreover, with DDL+DML we might suggest a better solution
Ronen Ariely
[Personal Site] [Blog] [Facebook]

I am going to buy a macbook pro for grade 12, and I need to know wheather I should get a macbook pro or a macbook pro retina. If someone could tell me (in a very simple way) which one is,better for me and why, I would be ever so apprreciative.

I am going to buy a macbook pro for grade 12, and I need to know wheather I should get a macbook pro or a macbook pro retina. If someone could tell me (in a very simple way) which one is,better for me and why, I would be ever so apprreciative.

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I know that
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read this -
Deadlocks with Bitmap Indexes
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and there's very little (or no) data modification, except for batch processes which occasionally re-populate the warehouse.
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> IDENTIFYING UNUSED INDEXES IN A SQL SERVER DATABASE
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> Index This: All About SQL Server Indexes
sp_BlitzIndex
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Which Index is better?

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