How to choose the indexes

[Former Member]

Hi gurus,

While doing performance tuning it is advisable to create indexes on the source tables of the datasource and also on the infocubes after loading the data.

so i have read that we have two kind of indexes B-Tree index and Bitmap index

As per my understanding the system creates the primary index we don't need to do it (am i right) Where can we see this primary indexes like on which fields and infoobjects this index is created.

But we can create the secondary index so while creating the secondary index where do we select the index type like Btree or Bitmap.

thanks and regards

Harish

[Former Member · Accepted solution]

Hi

Check this link

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N Ganesh

[Former Member]

Hi,

Check this link.

http://help.sap.com/saphelp_erp2004/helpdata/en/cf/21eb3a446011d189700000e8322d00/content.htm

babu

[Former Member]

Hi HB,

InfoCubes based on BITMAP indices built on the fact table

The indices that BW builds on ODS are BTree.

based on data target it will create Index. it also depend upon the database.

Also, we can check the index,

1) Go to Se11 select table /BI0/A<ODS>00 > Utilities> Data bse Object --> Check.

2) If you are using ODS Active table in any Start routine ,Make sure that the order of objects to be seleccted (select statement) should be in same order of index fields.

In Query, Use RSRT to know the SQL statement of the Query .and follow same logic explained above.

3) No need to create Secondary Index for Cube.

4) IT recreates the Index.

regards

babu

[Former Member]

hi

Check DB02

Assign points if useful

Thanks

N Ganesh