什么时候用到怠速

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select * from tbl_Articles WHERE ArticleID=2339575 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2339575 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2339575 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1081997,1069992,1080801,1074799,1067437,1078102,1076720,1074788,1074409,1094511,1081847,1051683,1083291,1049174,1067233,1062254,1081801,1068154,1060779,1081441,1064977,1077984,1085756,1061896,1081181,3417693,1063315,1067397,1080593,1115699) ORDER BY field (ArticleID,1081997,1069992,1080801,1074799,1067437,1078102,1076720,1074788,1074409,1094511,1081847,1051683,1083291,1049174,1067233,1062254,1081801,1068154,1060779,1081441,1064977,1077984,1085756,1061896,1081181,3417693,1063315,1067397,1080593,1115699)