变道为什么要加速

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select * from tbl_Articles WHERE ArticleID=1977358 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1977358 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1977358 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1554475,270606,129251,113512,1972426,1044609,2465441,114033,370388,195545,164155,332633,1090034,277201,273045,321564,239936,408157,316854,1066442,1041761,269017,1113724,1127381,286590,1108141,1095011,325373,400323,1112818) ORDER BY field (ArticleID,1554475,270606,129251,113512,1972426,1044609,2465441,114033,370388,195545,164155,332633,1090034,277201,273045,321564,239936,408157,316854,1066442,1041761,269017,1113724,1127381,286590,1108141,1095011,325373,400323,1112818)