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Index on Database
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
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
Last Comment
ASKER
Should I create separate logical index for each foreign key, or combine all foreign key within a single logical index ?
Tks
Tks
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.
Don't create a composite index just for saving indexes.
ASKER
One quick question, what's my consideration to create a composite index over a single index for each FK ? Tks
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Databases
Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.
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Only after that you should start think in another indexes but that's depends on your queries.