Are staging tables used only in Data warehouse project or in any SSIS
Project? I would like to know what is a staging table? Can anyone give me some examples on how to use it and in what circumstances it is implemented?
Also, may I please know the best practices while using it?
staging tables are just database tables containing your business data in some form or other. Staging is the process of preparing your business data, usually taken from some business application. For your average BI system you have to prepare the data before loading it. A staging table is essentially just a temporary table containing the business data, modified and/or cleaned. Depending on your actual case you may have several staging tables from different source systems that then are combined into the resulting fact table for the BI system.
A staging table allows incremental maintenance support for deferred materialized query table(s). It usually collects changes that must be applied to the materialized table (e.g., a fact table) to synchronize it with the contents of underlying tables. See IBM documentation here.
More info:
Staging Area is a temporary location where data from source systems is copied. Due to varying business cycles, data processing cycles, hardware and network resource limitations and geographical factors, it is not feasible to extract all the data from all Operational databases simultaneously. Data in the Data Warehouse can be either persistent (i.e. remains around for a long period) or transient (i.e. only remains around temporarily). Not all businesses require a Data Warehouse Staging Area. For many businesses, it is feasible to use ETL to copy data directly from operational databases into the Data Warehouse.
Here's an example of where usually is developed a staging table:
A staging table in BASEL Regulatory authority OFSAA is a set of tables to contain data in Product Processors and other Stage tables to store data from the Operational Systems of the Bank. Product Processors are created based on the various financial products that the bank caters to. Stage tables for Product Processors have been categorized as Exposures data of Product Processors.
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