缓存级别是啥意思

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select * from tbl_Articles WHERE ArticleID=239676 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=239676 LIMIT 0,1
select * from tbl_Articles_sphinx where id=239676 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1131325,1072721,1064447,1487226,1054358,1130039,2340426,1073385,1078509,1742954,1079840,1107022,1692195,1276802,1591229,1461915,1488695,1096995,1043706,1064147,1052807,1041958,1065485,1062248,1068734,1738962,1097097,1044673,1090062,1067901) ORDER BY field (ArticleID,1131325,1072721,1064447,1487226,1054358,1130039,2340426,1073385,1078509,1742954,1079840,1107022,1692195,1276802,1591229,1461915,1488695,1096995,1043706,1064147,1052807,1041958,1065485,1062248,1068734,1738962,1097097,1044673,1090062,1067901)