What is the surrogate key? what is the use of surrogate key? how to Create surrogate key Generator in scd2 in 8.5?
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Answer / suresh
surrogate key is alternate to primary key,it allows duplicates also,while maintain the hystorical data we use surrogate key
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Answer / prabhu rathnam
Surrogate key is used to generate sequence of number from 1 to n. It increment by 1 continously and sequencly.
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Answer / siva katta
"Surrogate key" which is system generated unique numeric values.
uses:
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when implimenting the SCD2 $SCD3. because these scd's are needs to maintain the historical information. so there is no way to maintain the historical information with Primary key constraint,so we are gonna generate the Surrogate key for identifying the records need to take the insert or update action.
Note :
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Surrogate key we can use for many purpose and so many cases but the above usage is one of these.
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Answer / karan am
surrogate key is alternate to primary key, in order to maintain historical data.
The key source can be a state file or a database sequence. If you are using a database sequence, the sequence must be created by the Surrogate Key stage. You cannot use a sequence previously created outside of DataStage.
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