如何修改nginx的最大连接数

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select * from tbl_Articles WHERE ArticleID=596457 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=596457 LIMIT 0,1
select * from tbl_Articles_sphinx where id=596457 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1067966,1061242,1057595,1053922,1074824,1106575,1069223,1112754,1101527,1095554,1068830,1094015,1055295,1100899,1095011,1051135,1070718,997282,1117968,1060755,1107118,1091025,1060657,1062971,1102172,1063799,1061030,1079191,1104335,1102328) ORDER BY field (ArticleID,1067966,1061242,1057595,1053922,1074824,1106575,1069223,1112754,1101527,1095554,1068830,1094015,1055295,1100899,1095011,1051135,1070718,997282,1117968,1060755,1107118,1091025,1060657,1062971,1102172,1063799,1061030,1079191,1104335,1102328)