Data warehouse persistent staging area

  • What is the persistent staging area?

    The Persistent Staging Area (PSA) is the inbound storage area in BW for data from the source systems.
    The requested data is saved, unchanged from the source system..

  • What is the staging area of a data warehouse?

    The Data Staging Area is a temporary storage area for data copied from Source Systems.
    In a Data Warehousing Architecture, a Data Staging Area is mostly necessary for time considerations.
    In other words, before data can be incorporated into the Data Warehouse, all essential data must be readily available.Aug 29, 2023.

  • A staging area, or landing zone, is an intermediate storage area used for data processing during the extract, transform and load (ETL) process.
    The data staging area sits between the data source(s) and the data target(s), which are often data warehouses, data marts, or other data repositories.
  • In a transient staging area approach, the data is only kept there until it is successfully loaded into the data warehouse and wiped out between loads.
    A Persistent Staging Area (PSA) is a staging area that does not wipe out the data between loads and contains full history from its data sources.
Between two loads, all staging tables are made empty again (or dropped and recreated before the next load). A Persistent Staging Area on the other hand, is a Staging Area that is not wiped out between loads: it contains full history from the source(s) that deliver data to it.

What happens when a record is loaded into the staging area?

Every record that is loaded into the Staging Area – a transient area (will be truncated regularly) – is sent to the PSA as well as to the upstream (usually Data Vault based) Integration Layer

What is a persistent staging area?

Between two loads, all staging tables are made empty again (or dropped and recreated before the next load)

A Persistent Staging Area on the other hand, is a Staging Area that is not wiped out between loads: it contains full history from the source (s) that deliver data to it

The “Staging Area” for passengers on an airport

What is a virtual staging access layer (PSA)?

For a normal load the PSA is just loaded from the Staging Area (preferably in parallel with loading the Enterprise Data Warehouse from the Staging Area)

A Virtual Staging Access Layer (for example implemented with views) ensures that ETL code for loading the Enterprise Data Warehouse can switch easily between Staging Area and PSA for loading data

As an introduction, I want to tell what a (non-persistent) Staging Area is. Some of you will already know, so be it,The Persistent Staging Area (PSA) is the inbound storage area in BW for data from the source systems. The requested data is saved, unchanged from the source system. Request data is stored in the transfer structure format in transparent, relational database tables in BI.

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