变动成本法存在的局限性表现在哪

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select * from tbl_Articles WHERE ArticleID=2450802 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2450802 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2450802 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1077240,1070088,1071661,1086095,1071481,1112917,1103012,1098207,1068118,1097283,1099121,1110067,1116948,1097823,1111248,1067895,1087481,1110606,1070578,1068264,1114412,1098525,1079315,1069045,1106078,1103851,1116315,1101917,1060755,1112500) ORDER BY field (ArticleID,1077240,1070088,1071661,1086095,1071481,1112917,1103012,1098207,1068118,1097283,1099121,1110067,1116948,1097823,1111248,1067895,1087481,1110606,1070578,1068264,1114412,1098525,1079315,1069045,1106078,1103851,1116315,1101917,1060755,1112500)