mysql数据库连接数过多导致系统出错,系统不能连接数据库,关键要看两个数据:
1、数据库系统允许的最大可连接数max_connections。这个参数是可以设置的。如果不设置,默认是100。最大是16384。
2、数据库当前的连接线程数threads_connected。这是动态变化的。 查看ma...
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数据库 时间:
2014-05-19 07:41:53
阅读次数:
532
准备工作: SQL> conn sys/root as sysdba
Connected. SQL> grant select on v_$sql_plan to scott; Grant succeeded.
SQL> grant select on v_$session to scott; Gr...
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数据库 时间:
2014-05-16 04:56:06
阅读次数:
431
http://acm.hdu.edu.cn/showproblem.php?pid=4635
Strongly connected
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 1381 Accepted Sub...
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其他好文 时间:
2014-05-15 03:26:53
阅读次数:
248
有用+1编辑有向图强连通分量在有向图G中,如果两个顶点vi,vj间(vi>vj)有一条从vi到vj的有向路径,同时还有一条从vj到vi的有向路径,则称两个顶点强连通(strongly
connected)。如果有向图G的每两个顶点都强连通,称G是一个强连通图。有向图的极大强连通子图,称为强连通分量(...
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其他好文 时间:
2014-05-14 22:40:02
阅读次数:
474
强连通分量有向图中, u可达v不一定意味着v可达u. 相互可达则属于同一个强连通分量(Strongly
Connected Component, SCC)有向图和它的转置的强连通分量相同所有SCC构成一个DAG 1、强连通图。...
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其他好文 时间:
2014-05-14 22:34:47
阅读次数:
585
题目描述N cities are connected by a network of M
one-way roads. It is known that these roads do not cross outside the cities. The
numeration of the cities...
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其他好文 时间:
2014-05-12 01:13:06
阅读次数:
345
Problem DescriptionIn 2100, since the sea level
rise, most of the cities disappear. Though some survived cities are still
connected with others, but m...
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其他好文 时间:
2014-05-10 07:33:38
阅读次数:
265
Problem DescriptionA tree is a well-known data
structure that is either empty (null, void, nothing) or is a set of one or more
nodes connected by dire...
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其他好文 时间:
2014-05-10 03:18:52
阅读次数:
374
PinSignalDescriptionApple pin
numbering*1GNDGround (-), internally connected with Pin 2 on iPod
motherboard302GNDAudio & Video ground (-), internally ...
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移动开发 时间:
2014-05-09 13:12:11
阅读次数:
640
点击打开链接
ROADS
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 10202
Accepted: 3786
Description
N cities named with numbers 1 ... N are connected with o...
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其他好文 时间:
2014-05-07 23:42:01
阅读次数:
617