Business Key In Data Warehouse

A business key or natural key is an index which identifies uniqueness of a row based on columns that exist naturally in a table according to business rules. Hi I try to explain it by using simple term.

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Business key in data warehouse. Surrogate keys essentially buffer the data warehouse from the operational environment by making it immune to any operational changes. They are used to relate the facts in the fact table to the appropriate rows in the dimension tables with the business keys only occurring in the much smaller dimension tables to keep the link with the identifiers in the operational systems. The data warehouse is the core of the BI system which is built for data analysis and reporting.

The Account_ID is the ETL substitute for the natural key from the transaction system because you would not usually load a sensitive element such as a credit card account number directly into the data warehouse. A Data Warehousing DW is process for collecting and managing data from varied sources to provide meaningful business insights. Most importantly they provide accurate and up-to-date insight into the warehouses workflow.

Surrogate keys are widely used and accepted design standard in data warehouses. This key is a column or group of columns that will uniquely identify a row in the table. The third key column called the Durable_Account_ID is the durable key assigned by the ETL system to tie all related rows together.

It join between the fact and dimension tables and is necessary to handle changes in dimension table attributes. Source system sequence-driven business keys make up 98 of the source data that any data warehouse or analytics system receives. A lot of the information is from my personal experience as a business intelligence professional both as a client and as a vendor.

However you shouldnt be relying on the business keys as your unique identifier in the data warehouse. These tools allow users to manipulate and access the operational data sets. This site is divided into six main areas.

A surrogate key is an artificial or synthetic key that is used as a substitute for a natural key. These are two different kinds of keys. These surrogate keys are used to join dimension and fact tables.

Natural Key Pros. A tables primary key should be used for identifying. The theory is that these sequences should never change and should represent the same data once established and assigned.

A natural key also known as business key or domain key is a type of unique key in a database formed of attributes that exist and are used in the external world outside the database ie. Fewer table joins since join columns have meaning. Usually database sequences are used to generate surrogate key so it is always unique number Surrogate keys cannot be NULLs.

All tables in a relational database should not will just should have a declared primary key PK. In the business domain or domain of discourse. A Data warehouse is typically used to connect and analyze business data from heterogeneous sources.

Even down to transaction id e-mail id or some of the unstructured data sets such as document id contain surrogates. Data warehouse surrogate keys are sequentially generated meaningless numbers associated with each and every record in the data warehouse. The business keys are the unique row identifiers from your source systems.

Key values have business meaning and can be used as a search key when querying the table. It is sequentially generated unique number attached with each and every record in a Dimension table in any Data Warehouse. Business Key usually be the natural key by setting the business key you could be able to apply different type of SCD to maintain your DW more information can be found through the link below.

Another key characteristic of a datawarehouse is its decision support tools. The counter is a surrogate key and the business key is a natural key. You definitely want these too as otherwise you wont be able to map the data in your data warehouse back to your source system see data warehousing tip 1.

Surrogate keys typically integers have the added-value of making your table relations faster and more economic in storage and update speed even better foreign keys do not need to be updated when using surrogate keys in contrast with business key fields that do change now and then. Actually a surrogate key in a data warehouse is more than just a substitute for a natural key. This Data Warehousing site aims to help people get a good high-level understanding of what it takes to implement a successful data warehouse project.

Column s and primary key index already exist so no disk extra space is required for the extra columnindex that would be used by a surrogate key column. They have nothing to do with the business keys. For example business keys are customer code in a customer table composite of sales order header number and sales order item line number within a sales order details table.

In a data warehouse a surrogate key is a necessary generalization of the natural production key and is one of the basic elements of data warehouse design.

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