迈速表指针不稳是什么原因

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select * from tbl_Articles WHERE ArticleID=188469 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=188469 LIMIT 0,1
select * from tbl_Articles_sphinx where id=188469 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1117299,1051599,1100723,1056968,1071501,1105087,1082261,1112871,1093989,1121254,1081247,1069992,1065361,1125059,1108992,1076576,1101587,1121210,1073577,1092712,1106232,983947,1078182,1101935,1048354,1062716,1081757,1077182,1119478,1065729) ORDER BY field (ArticleID,1117299,1051599,1100723,1056968,1071501,1105087,1082261,1112871,1093989,1121254,1081247,1069992,1065361,1125059,1108992,1076576,1101587,1121210,1073577,1092712,1106232,983947,1078182,1101935,1048354,1062716,1081757,1077182,1119478,1065729)