什么是一级超限

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select * from tbl_Articles WHERE ArticleID=2959982 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2959982 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2959982 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1078535,1061282,1125052,1108668,1102466,1059801,1068424,1088546,1064553,1080747,1064447,1072443,1089450,1936179,1077826,1102030,1103432,1098219,1063117,1094615,1097069,1089008,1082303,1088910,1065917,1106637,1086270,1054674,1119137,1109118) ORDER BY field (ArticleID,1078535,1061282,1125052,1108668,1102466,1059801,1068424,1088546,1064553,1080747,1064447,1072443,1089450,1936179,1077826,1102030,1103432,1098219,1063117,1094615,1097069,1089008,1082303,1088910,1065917,1106637,1086270,1054674,1119137,1109118)