Patent attributes
Approaches for a persistent data store that may be used to service data queries originating from data warehousing applications, operational reporting applications, or data archiving and data feed applications. At periodic intervals, data may be extracted from one or more disparate data sources. The extracted data may be stored in the persistent data store in a tabular format. A backward delta data set is generated. The backward delta data set identifies what additions, deletions, and modifications need to be made to the data stored in the persistent data store to return the data to a most recent version. Backward delta data sets are stored and maintained in accordance with a policy that instructs two or more backward delta data sets, associated with a continuous interval of time, be combined into a single backward delta data set after the expiration of a specified amount of time.
