什么是熔断

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select * from tbl_Articles WHERE ArticleID=821680 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=821680 LIMIT 0,1
select * from tbl_Articles_sphinx where id=821680 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1103103,1119446,511964,1119033,1100517,1109230,101584,2461151,1084439,1089269,1095972,1303942,85632,101716,1100125,535592,1084321,557949,1097757,1102562,1122090,1083125,88110,1063043,1108524,483054,1118877,1082340,1100695,1119079) ORDER BY field (ArticleID,1103103,1119446,511964,1119033,1100517,1109230,101584,2461151,1084439,1089269,1095972,1303942,85632,101716,1100125,535592,1084321,557949,1097757,1102562,1122090,1083125,88110,1063043,1108524,483054,1118877,1082340,1100695,1119079)