Consideration while scheduling long running BIRT reports.
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Many times Application servers are restrated because of different reasons. If an application server is executing scheduled reports while the system is restarted then those reports will not re-execute automatically. To avoid that condition scheduled reports are rescheduled to run when report framework thinks that there is no activity on a report for 15 minutes. Report framework thinks that there is no activity on a report when a report SQL runs for more than 15 minutes or the report renders for more than 15 minutes. If a report SQL runs for 15 minutes then report framework thinks that the server executing the report has gonedown and reschedules the report and there is a chance that this goes in to a cycle and after every 15 to 30 minutes (30 is just an example) the report is scheduled again. When this happens the report user will get a scheduled report email every 15 to 30 minutes for the exact same report.
This 15 minutes idle time is default value which is configurable. This value is set in LOCK