java - Search results from Main and Archive schema -

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we got move old dated records history , archive schemas. , regular user search has refers 3 schemas main, history, archive. think of making history , archive data fetch service , enable multiple threads @ service layer fetch records 3 different sources , union them. application environment spring boot. please advise me what's best way. in advance

ps: pls give tips create multiple threads , aync processing service layer, apart spring async annotation





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