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What are staging databases?
A staging database is a user-created PDW database that stores data temporarily while it is loaded into the appliance. For example, an ELT process could load data into a temporary table, process the data by cleansing and de-duping, and then insert the data into the target fact table.
How do databases connect to staging?
To Connect to the Staging Database Right-click Virtual DB, and then select Connect Using. On the New Database Connection dialog box, fill in the following fields: Database URL – The URL to the staging database in this format: jdbc:axiondb: DatabaseName : DatabaseLocation .
What is staging table in MySQL?
Staging is one (or more) tables in which the data lives only long enough to be handed off to Normalization, Summary, and the Fact tables.
What is a staging room?
A staging area (otherwise staging point, staging base, or staging post) is a location where organisms, people, vehicles, equipment, or material are assembled before use. In construction, a designated area where vehicles, supplies, and construction equipment are positioned for access and use to a construction site.
What is a data staging table?
Permanent tables used to store temporary data are often called staging tables. In this way, the data from the external source can be processed before its transfer to another permanent table that is part of a database supporting an enterprise application.
When to use a staging database in SQL Server?
When a staging database is not specified for a load, SQL ServerPDW creates the temporary tables in the destination database and uses them to store the loaded data before it inserts the loaded data into the permanent destination tables.
How is a staging database used in a PDW?
A staging database is a user-created PDW database that stores data temporarily while it is loaded into the appliance. When a staging database is specified for a load, the appliance first copies the data to the staging database and then copies the data from temporary tables in the staging database to permanent tables in the destination database.
The staging database can be shared by all load jobs for all destination databases. The size of the staging database is customer-specific. Initially, when first populating the appliance, the staging database should be large enough to accommodate the initial load jobs.
How to reduce table fragmentation in a staging database?
To reduce table fragmentation, you can create a user-defined staging database. Or, when rollback from a load failure is not a concern, you can use the fastappend loading mode to improve performance by skipping the temporary table and loading directly into the destination table.