OVERVIEW OF DATA STREAM PROCESSING
Informally, a data stream is defined as an unbounded (or never-ending) sequence of data items that are usually ordered either explicitly by a timestamp or by the values of one or more data elements (e.g., packet sequence identifier in an IP session). It is assumed that the format of a data stream is known in terms of its data elements and their types. Simplistically, a data item of a data stream can be viewed as a tuple1 of a relation. Correspondingly, a data element of a data item is analogous to an attribute of a relation.
KeywordsData Stream Data Item Query Plan Continuous Query Complex Event Processing
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