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Copy file name to clipboardExpand all lines: src/guides/duplicate-data.md
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@@ -6,7 +6,7 @@ Segment guarantees that 99% of your data won't have duplicates within an approxi
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##99% deduplication
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Segment has a special deduplication service that sits behind the`api.segment.com` endpoint and attempts to drop 99% of duplicate data.To achieve it,Segment stores at least 24 hours worth of event `messageId`s, which allows Segment systems to deduplicate any data that appears with the same`messageId` within the stored values.
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Segment has a special deduplication service that sits behind the`api.segment.com` endpoint and attempts to drop 99% of duplicate data. Segment stores at least 24 hours' worth of event `messageId`s, which allows Segment to deduplicate any data that appears with the same`messageId` within the stored values.
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Segment deduplicates on the event's `messageId`,_not_ on the contents of the event payload. Segment doesn't have a built-in way to deduplicate data for events that don't generate`messageId`s.