Data Warehouses
Data warehouses are used to store data from multiple sources in a single location. Not all data that a company uses must be stored in a warehouse. Oftentimes the data that is stored in these warehouses is long-term in nature and do not require much updating. Many of the records in these databases are essentially read-only and are used for gathering intelligence about a business, such as its per-quarter earnings, its most popular items, or customer demographics.
Other than for basic backup purposes, it is important to have copies of data in a data warehouse because the warehouses are often followed by new, improved versions of themselves. After the initial version of a data warehouse is created, requirements may be altered which can require the database to be changed or expanded. Fortunately, there is no reason to start again from scratch because the new database can be built upon existing data.
No comments:
Post a Comment