怎样设置默认优先使用卡2的流量

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select * from tbl_Articles WHERE ArticleID=3245361 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3245361 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3245361 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1083113,1115501,1107028,1101921,1114048,1073066,1064977,1105543,1114000,1115699,1062716,1069221,1114412,1048236,1111248,1078735,1051075,1048494,1108229,1104571,1082203,1069159,1116083,1079946,1122422,1090909,1110546,1043675,1072837,1016441) ORDER BY field (ArticleID,1083113,1115501,1107028,1101921,1114048,1073066,1064977,1105543,1114000,1115699,1062716,1069221,1114412,1048236,1111248,1078735,1051075,1048494,1108229,1104571,1082203,1069159,1116083,1079946,1122422,1090909,1110546,1043675,1072837,1016441)