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Reference.org
Relational data stream management system
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<p>A relational data stream management system (RDSMS) is a distributed, in-memory <a href="/facts/Data_stream_management_system/F8tLdJEt">data stream management system</a> (DSMS) that is designed to use standards-compliant <a href="/facts/SQL/UjQLJcYm">SQL</a> queries to process unstructured and structured data streams in real-time. Unlike SQL queries executed in a traditional <a href="/facts/RDBMS/pEKGmJLy">RDBMS</a>, which return a result and exit, SQL queries executed in a RDSMS do not exit, generating results continuously as new data become available. Continuous SQL queries in a RDSMS use the SQL Window function to analyze, join and aggregate data streams over fixed or sliding windows. Windows can be specified as time-based or row-based. </p>