Answered by swetha on 2005-03-30 12:00:33: OLTP  Current data Short database transactions Online update/insert/delete Normalization is promoted High volume transactions Transaction recovery is necessary   OLAP Current and historical data Long database transactions Batch update/insert/delete Denormalization is promoted Low...

ram

• Aug 30th, 2016

OLTP: Original Source of data
Running on fundamental business task

OLAP: Data coming from various OLTP sources
Problem Solving, Decision Making

Pravin

• Jan 16th, 2015

Very useful answer.
thanks.

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Answered by: saravanan

• Dec 2nd, 2005

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Surrogate key is a unique identification key, it is like an artificial or alternative key to production key, bz the production key may be alphanumeric or composite key but the surrogate key is always single numeric key. Assume the production key is an alphanumeric field if you create an index for this fields it will occupy more space, so it is not advisable to join/index, bz generally all the datawarehousing fact table are having historical data. These factable are linked with so many dimension table. if it's a numerical fields the performance is high

P.Manideep

• Oct 29th, 2017

Surrogate key is system generated key. It is a column or set of columns declared as primary key instead of real of natural key.

Anukul Thawarey

• Aug 8th, 2017

Just to add on to this point, we can also have date stamp as in the format (yyyymmdd) which is actually an 4 Byte unsigned integer to keep track of the historical data. This date stamp column can also be considered as an surrogate key.

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