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mysql 设置/查看mysql连接数
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...
分类:数据库   时间:2014-05-19 07:41:53    阅读次数:532
dbms_xplan的display_cursor查看执行计划
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...
分类:数据库   时间:2014-05-16 04:56:06    阅读次数:431
hdu 4635(强连通+缩点)
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...
分类:其他好文   时间:2014-05-15 03:26:53    阅读次数:248
强连通分量
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(...
分类:其他好文   时间:2014-05-14 22:40:02    阅读次数:474
强连通分量!
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。...
分类:其他好文   时间:2014-05-14 22:34:47    阅读次数:585
hust 1019 A dangerous trip
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...
分类:其他好文   时间:2014-05-12 01:13:06    阅读次数:345
hdu 3371 Connect the Cities
Problem DescriptionIn 2100, since the sea level rise, most of the cities disappear. Though some survived cities are still connected with others, but m...
分类:其他好文   时间:2014-05-10 07:33:38    阅读次数:265
hdu 1325 Is It A Tree?
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...
分类:其他好文   时间:2014-05-10 03:18:52    阅读次数:374
[转]Apple iPod, iPhone (2g, 3g), iPad Dock connector pinout
PinSignalDescriptionApple pin numbering*1GNDGround (-), internally connected with Pin 2 on iPod motherboard302GNDAudio & Video ground (-), internally ...
分类:移动开发   时间:2014-05-09 13:12:11    阅读次数:640
POJ 1724 ROADS
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...
分类:其他好文   时间:2014-05-07 23:42:01    阅读次数:617
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