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Index on Database

Posted on 2014-11-12
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Last Modified: 2014-11-24
I have two tables and no index is defined. This is a data warehouse tables that will be loaded into MS AS Cube.

DIM_CURRENCY (CURRENCY_IDX, CURRENCYCODE, NAME, SYMBOL, RATE)

FACT_SALES_INVOICE (CURRENCY_IDX, REGION_COUNTRY, TRANSDATE, CUSTOMER_IDX, SALESMAN_IDX, BASEAMOUNT, QTY, INVOICENO, COMPANY)

What kind of index should I create on each tables ?
As there is no primary key on fact table, should I create individual index key for each attribute, or a single key combining all attributes ?

Tks
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Question by:AXISHK
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by:Vitor Montalvão
ID: 40439383
You should have at least a primary key in both tables and a foreign key in the fact tables to guarantee the relationship between tables.
Only after that you should start think in another indexes but that's depends on your queries.
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by:AXISHK
ID: 40439943
Should I create separate logical index for each foreign key, or combine all foreign key within a single logical index ?

Tks
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by:Vitor Montalvão
ID: 40439975
Normally you should create an index for each FK so will boost the JOIN between tables.
Don't create a composite index just for saving indexes.
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by:AXISHK
ID: 40440000
One quick question, what's my consideration to create a composite index over  a single index for each FK ?  Tks
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Vitor Montalvão earned 500 total points
ID: 40440071
My recommendation is to create indexes for FK with the same fields. A composite index for a FK will only make sense if the FK is composed by more than one field.
If a table has for example 4 FK's and each FK are relative to different tables then you should create 4 indexes, one for each FK. But if for example the table only has a FK that is composed by 4 fields and relative only to another table, then you should create a composite index with those 4 fields.

Hope that I was clear.
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