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在Ubuntu custom kernel上裝perf by compile
Using perf, the Linux Performance Analysis tool on Ubuntu KarmicA lot has been going on with Linux performance counters (now called performance events...
分类:其他好文   时间:2014-05-16 04:06:37    阅读次数:386
Don’t Assume – Per Session Buffers
MySQL has a number of global buffers, i.e. your SGA. There are also a number of per session/thread buffers that combined with other memory usage const...
分类:其他好文   时间:2014-05-15 07:34:17    阅读次数:307
继承和组合、抽象类和接口
继承和组合的使用原则:     1、很多资料中提到的一点,如果两个类之间是is-a的关系,那么就使用继承,而如果是has-a的关系就使用组合。        但是这也不是代表is-a是使用继承的绝对理由,有时候为了消除继承关系带来的耦合,使用组合可以更好的实现封装细节。        如果在一个系统中大量应用继承,继承层次深了,那么会给系统的开发和维护带来困难。     2、无论何时,如果...
分类:其他好文   时间:2014-05-15 01:38:59    阅读次数:240
hdu4455之树状数组+DP
Substrings Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1571    Accepted Submission(s): 459 Problem Description XXX has an arra...
分类:其他好文   时间:2014-05-15 01:35:46    阅读次数:338
LeetCode--Linked List Cycle
Linked List Cycle  Total Accepted: 17148 Total Submissions: 49300My Submissions Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra sp...
分类:其他好文   时间:2014-05-15 00:13:50    阅读次数:279
【LeetCode】Linked List Cycle
Linked List CycleGiven a linked list, determine if it has a cycle in it.Follow up:Can you solve it without using extra space?做完Linked List Cycle II在做这...
分类:其他好文   时间:2014-05-14 23:30:00    阅读次数:399
php访问mysql 封装
dblink = @$func($dbhost,$dbuser,$dbpw) ; if ($halt && !$this->dblink) { $this->halt("无法链接数据库!"); } //设置查询字符集 mysql_query("SET character_set_connection...
分类:数据库   时间:2014-05-14 22:52:20    阅读次数:461
Pat(Advanced Level)Practice--1043(Is It a Binary Search Tree)
Pat1043代码题目描述:A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties:The left subtree of a node contain...
分类:其他好文   时间:2014-05-14 22:03:25    阅读次数:487
【Java编程】JDBC注入攻击-Statement 与 PreparedStatement
在上一篇【Java编程】建立一个简单的JDBC连接-Drivers, Connection, Statement and PreparedStatement我们介绍了如何使用JDBC驱动建立一个简单的连接,并实现使用Statement和PreparedStatement进行数据库查询,本篇blog将接着上篇blog通过SQL注入攻击比较Statement和PreparedStatement。当然这两者还有很多其他方面的不同,在之后的blog中会继续更新。...
分类:数据库   时间:2014-05-14 20:44:25    阅读次数:497
MongoDB---出现no write has been done on this connection解决方案
出现no write has been done on this connection解决方案...
分类:数据库   时间:2014-05-14 19:42:51    阅读次数:403
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