什么是证据保全

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select * from tbl_Articles WHERE ArticleID=497562 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=497562 LIMIT 0,1
select * from tbl_Articles_sphinx where id=497562 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1371978,1369400,1092411,1065289,837614,1653202,2364106,1080397,3373261,519122,3249381,2724111,718701,1041950,568350,533834,1161044,1061504,3078989,826835,1513980,1137431,1062828,3003755,1191759,1211158,1370671,1176897,801082,1043123) ORDER BY field (ArticleID,1371978,1369400,1092411,1065289,837614,1653202,2364106,1080397,3373261,519122,3249381,2724111,718701,1041950,568350,533834,1161044,1061504,3078989,826835,1513980,1137431,1062828,3003755,1191759,1211158,1370671,1176897,801082,1043123)