什么情况下用到陡坡缓降

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select * from tbl_Articles WHERE ArticleID=654453 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=654453 LIMIT 0,1
select * from tbl_Articles_sphinx where id=654453 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1079437,1067233,988570,1063115,1085114,1074290,1078354,1084917,1068330,1070262,1081181,1071233,1075491,1052807,1041271,1066426,1015577,1082117,1061896,1066442,983962,1041719,1085376,1078320,1065155,988905,1057607,1062706,1065359,1083160) ORDER BY field (ArticleID,1079437,1067233,988570,1063115,1085114,1074290,1078354,1084917,1068330,1070262,1081181,1071233,1075491,1052807,1041271,1066426,1015577,1082117,1061896,1066442,983962,1041719,1085376,1078320,1065155,988905,1057607,1062706,1065359,1083160)