the mode of processing in which the next step of processing depends on the results obtained by the existing step in execution.

an operation that takes two relations as operands and produces a new relation by concatenating the tuples and matching the corresponding columns when a stated condition holds between the two.

is often used to mean any delay or waiting that increases real or perceived response time beyond the response time desired.

After extracting, cleaning and transforming, data must be loaded into the warehouse. Additional preprocessing may still be required: checking integrity constraints; sorting; summarization, aggregation and other computation to build the derived tables stored in the warehouse; building indices and other access paths; and partitionaing to multiple target storage areas. Load utilities can be used for these operations.

the event that occurs when update is done against a data base record and the transaction has not yet reached a commit point.

the automatic recording of data with regard to the access of the data, the updates to the data, etc

a data view or description that does not depend on a physical storage device or a computer program.

he rate of arrival of transactions at the moment of peak period processing.

The process of consolidating, relating and synchronizing data elements with the same or similar meaning from different systems. Metadata synchronization joins these differing elements together in the data warehouse to allow for easier access.

a language used to specify other languages.