什么叫限流

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select * from tbl_Articles WHERE ArticleID=3083208 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3083208 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3083208 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1094757,360644,3176258,2825439,460200,360138,87074,86151,1096675,370901,86743,1096981,86632,1086172,1060878,365712,360082,86765,365436,100494,1062345,1054139,793061,363143,1471041,86108,1089394,2127968,371547,1114310) ORDER BY field (ArticleID,1094757,360644,3176258,2825439,460200,360138,87074,86151,1096675,370901,86743,1096981,86632,1086172,1060878,365712,360082,86765,365436,100494,1062345,1054139,793061,363143,1471041,86108,1089394,2127968,371547,1114310)