为什么SBS弹性比BSB弹性好

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select * from tbl_Articles_data WHERE ArticleID=2156223 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2156223 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2096509,258560,1083059,2858724,2895860,202432,185538,2499537,1055067,846983,1518143,181601,621317,1384925,2919627,1133191,366728,241042,1055668,1086162,2352069,756810,3221263,272599,1802819,1092650,1488839,334826,644828,2951980) ORDER BY field (ArticleID,2096509,258560,1083059,2858724,2895860,202432,185538,2499537,1055067,846983,1518143,181601,621317,1384925,2919627,1133191,366728,241042,1055668,1086162,2352069,756810,3221263,272599,1802819,1092650,1488839,334826,644828,2951980)