Fact Data Warehousing
Encyclopedia
In data warehousing
a fact is a value or measurement, which represents a fact about the managed entity or system.
Facts as reported by the reporting entity are said to be at raw level.
E.g. if a BTS received 1,000 requests for traffic channel allocation, it allocates for 820 and rejects the remaining then it would report 3 facts or measurements to a management system:
Facts at raw level are further aggregated to higher levels in various dimensions
to extract more service or business-relevant information out of it. These are called aggregates or summaries or aggregated facts.
E.g. if there are 3 BTSs in a city, then facts above can be aggregated from BTS to city level in network dimension.
E.g.
Data warehouse
In computing, a data warehouse is a database used for reporting and analysis. The data stored in the warehouse is uploaded from the operational systems. The data may pass through an operational data store for additional operations before it is used in the DW for reporting.A data warehouse...
a fact is a value or measurement, which represents a fact about the managed entity or system.
Facts as reported by the reporting entity are said to be at raw level.
E.g. if a BTS received 1,000 requests for traffic channel allocation, it allocates for 820 and rejects the remaining then it would report 3 facts or measurements to a management system:
- tch_req_total = 1000
- tch_req_success = 820
- tch_req_fail = 180
Facts at raw level are further aggregated to higher levels in various dimensions
Dimension (data warehouse)
In a data warehouse, a dimension is a data element that categorizes each item in a data set into non-overlapping regions. A data warehouse dimension provides the means to "slice and dice" data in a data warehouse. Dimensions provide structured labeling information to otherwise unordered numeric...
to extract more service or business-relevant information out of it. These are called aggregates or summaries or aggregated facts.
E.g. if there are 3 BTSs in a city, then facts above can be aggregated from BTS to city level in network dimension.
E.g.
