Data warehouse without foreign keys

  • Can a database have no foreign keys?

    Note that foreign keys are not mandatory, and a table may have no foreign keys.
    Conversely, every column in a table may have a foreign key constraint..

  • Should you have foreign keys in data warehouse?

    However, you do not want the foreign key constraints to be activated on the production data warehouse database, as it consumes too many resources to check it during every insert operation – as it typically slows down the ETL processing too much..

  • What happens if there is no foreign key?

    Without FOREIGN KEY constraints, the situation is very much the same, It is possible to DELETE a parent row without deleting its dependent children rows.
    A child row JOIN ed with a respective (deleted) parent row comes out empty.
    There is no IS NOT NULL to help you, but identifying those rows is still trivial.Jul 22, 2022.

  • Foreign keys are important for several reasons, including the following: Streamline data sets.
    With foreign keys, database administrators don't have to store repeated data in multiple tables.
    They make data available to different tables without creating redundant data sets.
  • While foreign key constraints are the traditional way of maintaining integrity in a database, PlanetScale was built with a focus on scalability and zero-downtime schema updates, something that foreign key constraints interfere with.
  • You can disable a foreign key constraint during INSERT and UPDATE transactions in SQL Server by using SQL Server Management Studio or Transact-SQL.
    Use this option if you know that new data will not violate the existing constraint or if the constraint applies only to the data already in the database.
Apr 22, 2010Foreign key constraint "activates" during inserts and updates (this is when it needs to check that the key value exists in the parent table) and  Do you really need to use the primary-foreign key pattern in a data Is Foreign key required in Star or Snow flake schema?Primary and Foreign Key in DW tables - Stack OverflowShould I add Foreign Key constraint when creating Fact Table in SQL?More results from stackoverflow.com
Apr 22, 2010The reason for using a foreign key constraint in a data warehouse is the same as for any other database: to ensure data integrity. It is also  Do you really need to use the primary-foreign key pattern in a data Is Foreign key required in Star or Snow flake schema?Primary and Foreign Key in DW tables - Stack OverflowShould I add Foreign Key constraint when creating Fact Table in SQL?More results from stackoverflow.com
Apr 22, 2010The reason for using a foreign key constraint in a data warehouse is the same as for any other database: to ensure data integrity. It is also  Do you really need to use the primary-foreign key pattern in a data Is Foreign key required in Star or Snow flake schema?Database Design Without Foreign Keys - sql - Stack OverflowShould I add Foreign Key constraint when creating Fact Table in SQL?More results from stackoverflow.com

Should I use a FOREIGN KEY constraint in a data warehouse?

That sounds like a good idea for a DW

You document the relationships as the system is designed, but you don't break ETL in the event there is an issue with the source system

The reason for using a foreign key constraint in a data warehouse is the same as for any other database: to ensure data integrity

Should I use a virtual foreign key in a DataWarehouse?

You need to use a VIRTUAL foreign key: the relation is their but not the constraint

If you damage the foreign key relations in a Datawarehouse you are doing something wrong

If you disable them during inserts and there is an mismatch or orphan, you won't be able to reenable them, so what's the point

Why are there no foreign keys in a database?

1

Potential data integrity issues, duh The obvious problem with the lack of foreign keys is that a database can't enforce referential integrity and if it wasn't taken care of properly at the higher level then this might lead to inconsistent data (child rows without corresponding parent rows)


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