可用空间剩余空间什么意思

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select * from tbl_Articles WHERE ArticleID=169293 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=169293 LIMIT 0,1
select * from tbl_Articles_sphinx where id=169293 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1370312,1074312,1102388,1115787,1986260,996794,1080593,1057770,1067769,1608737,1123521,1370928,2158775,1382314,1308797,1063735,1412959,1083453,1005452,1551281,1087893,1074686,1062346,1068937,1132843,1303469,1073528,1529105,1056858,1096080) ORDER BY field (ArticleID,1370312,1074312,1102388,1115787,1986260,996794,1080593,1057770,1067769,1608737,1123521,1370928,2158775,1382314,1308797,1063735,1412959,1083453,1005452,1551281,1087893,1074686,1062346,1068937,1132843,1303469,1073528,1529105,1056858,1096080)