EVENT DETECTION WITH CONCURRENT DATA UPDATES

摘要

An event detection system allows data to be inserted while event conditions are being checked. Each record is assigned a time stamp as it is inserted into a database. Each event condition check is assigned a time stamp range. The event condition check then produces only those matches that have at least one record with a time stamp in the range and no record with a time stamp after the range. After each event condition check, the range is changed so that, in subsequent checks, no part of a previous range is duplicated and no time stamps are excluded from every checked range. As a result of this process, records may be inserted while event conditions are being checked.