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After around 12 million events are published, a sudden drop can be observed in receiver performance that can be considered as the break point of MySQL event store. In order to continue processing events at the same rate receiving events without a major performance degradaton data has to be purged periodically before it reaches the upper limit. See https://docs.wso2.com/display/DAS310/Purging+Data for more information. Another type of event store such as HBase event store should be used when data purging is not possible.