失效安全数主要用来估计什么

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select * from tbl_Articles WHERE ArticleID=474724 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=474724 LIMIT 0,1
select * from tbl_Articles_sphinx where id=474724 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(923787,721501,1017119,418603,82410,1904873,503589,810639,2528768,680070,1115039,2918055,1104789,1111785,1151358,709216,680958,384113,1196595,362559,1828586,1631802,3161587,996414,747161,1132975,855473,392363,481136,732939) ORDER BY field (ArticleID,923787,721501,1017119,418603,82410,1904873,503589,810639,2528768,680070,1115039,2918055,1104789,1111785,1151358,709216,680958,384113,1196595,362559,1828586,1631802,3161587,996414,747161,1132975,855473,392363,481136,732939)