为什么会有蟑螂出现

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select * from tbl_Articles WHERE ArticleID=3479543 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3479543 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3479543 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1128687,1131585,1138769,1127021,1275292,1116225,1069069,1082171,1063731,1061716,990079,1121532,1120952,1107721,1100725,1123475,1132573,1131855,1042350,1127739,1002752,1129991,1130412,1123519,1124861,1126244,1009156,1128385,1122406,1129591) ORDER BY field (ArticleID,1128687,1131585,1138769,1127021,1275292,1116225,1069069,1082171,1063731,1061716,990079,1121532,1120952,1107721,1100725,1123475,1132573,1131855,1042350,1127739,1002752,1129991,1130412,1123519,1124861,1126244,1009156,1128385,1122406,1129591)