How does the engine discern which data to retain? Is it based solely on the queries registered with the engine at the time the event comes in?

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How does the engine discern which data to retain? Is it based solely on the queries registered with the engine at the time the event comes in?

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Yes, the data that the engine retains is based solely on the queries registered with the engine. The engine retains the minimum needed events and/or derived data to satisfy any started statements. Thus, if one has an engine running and consuming events, but has no queries registered with the engine, the engine does not retain any data.

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