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最新文章列表
如何调整ABAP程序的性能(copy)
1、使用where语句
不推荐
Select * from zflight.
Check : zflight-airln = ‘LF’ and zflight-fligh = ‘BW222’.
Endselect.
推荐
Select * from zflight where airln = ‘LF’ and fligh = ‘222’.
Endselect.
2、使用聚合函数
不推荐
Maxnu ...
合理运用remapResults属性
Proper Usage of remapResults="true"
The remapResults attribute is available on 【statement】, 【select】, and 【procedure】 mapped statements. It is an optional attribute and the default value is ...
Performance Tips for JDBC
翻译:陈先波(turbochen@163.com)
阅读原文:http://www.theserverside.com/articles/article.tss?l=JDBCPerformance_PartIII
一、使用Statement而不是PreparedStatement对象
JDBC驱动的最佳化是基于使用的是什么功能. 选择PreparedStatement还是Statement取决于你 ...
[zz]Comparing Two High-Performance I/O Design Patterns
http://www.artima.com/articles/io_design_patterns3.html
System I/O can be blocking, or non-blocking synchronous, or non-blocking asynchronous [1, 2].
Blocking I/O means that the calling system does ...
在数据库中执行一个批处理SQL语句(zhuan)
在数据库中执行一个批处理SQL语句
With batch updating, a set of SQL statements is assembled and then sent altogether to the database for execution. Batch updating can improve performance.
This example creates a batch ...
IBM 捐赠Eclipse 3.2.1 多国语言包, 将Eclipse立即汉化
昨天,IBM向Eclipse基金会捐赠了Eclipse 3.2.1的多国语言包。其中包括了Eclipse工程集中的许多工程。其列表如下:
Eclipse 工程;
Eclipse Web 工具平台(Web Tools Platform ,WTP) 工程;
Eclipse 测试和性能工具平台(Test and Performance Tools Platform ,T ...
java vs rails vs php
这篇文章(http://www.tbray.org/ongoing/When/200x/2006/11/10/Comparing-Frameworks)从可升级性,开发速度,开发工具,可维护性比较了java,rails,php。作者个人认为他们最重要的是可维护性,因为开发完成一个系统,维护它是一个长期的过程。从文章中提供的示意图可看出rails的开发速度和可维护性是非常的好,以前就听说RAILS是个 ...
Linux核心数据结构--buffer_head
此结构包含关于buffer cache中一块缓存的信息。
/* bh state bits */
#define BH_Uptodate 0 /* 1 if the buffer contains valid data */
#define BH_Dirty 1 /* 1 if the buffer is dirty */
#def ...
PSP tutorial
this tutorial can now also be seen at the site of lord ( a senior member here ) http://homebrewhowto.com/ look in the forums in the psp section/tutorails
thanks to nukewire this Tutorial can also be ...
Spring实时统计与监控Spring-Dashboard及Spring集群Terracotta for Spring
Spring实时统计与监控Spring-Dashboard及Spring集群Terracotta for Spring
1、Spring实时统计与监控Spring-Dashboard
http://www.spacebug.com/projects_spring-dashboard.html
Spring-Dashboard可以为任何基于Spring的Web应用系统提供实时的统计和监控信息。
开 ...
A Critique of the Sharpe Ratio
Author: David Harding, Winton Capital Management
The Sharpe ratio is a statistic which aims to sum up the desirability of a risky investment strategy or instrument by dividing the average period retur ...
AOP的应用领域
百事通信息网
AOP的应用领域:
Authentication 权限
Caching 缓存
Context passing 内容传递
Error handling 错误处理
Lazy loading 懒加载
Debugging 调试
logging, tracing, profiling and monitoring 记录跟踪 优化 校准
Performance ...
InfraRED 监视系统的性能
InfraRED 监视系统的性能-- InfraRED (http://infrared.sourceforge.net/versions/latest/)is a tool for monitoring performance of a J2EE application and diagnosing performance problems. It collects me ...
Java程序性能优化 --转
<script language="javascript" type="text/javascript">document.title="Java程序性能优化 ! - "+document.title</script>
一、避免在循环条件中使用复杂表达式
在不做编译优化的情况下,在循环中,循环条件会被反复计 ...
Finally made it - A designator tag system for heavy concurrent environment
Download full Source Code here .
public class Designatorextends java.lang.Objectimplements java.lang.CharSequence, java.lang.Comparable<java.lang.CharSequence>This class is designed and impleme ...
IDEforLaszlo 0.2.0 发布了!
刚收到laszlo-user的邮件说:IDEforLaszlo0.2.0 to Support OpenLaszlo 3.2 Released新的laszloIDE插件版本发布了! 是个好消息!原文如下:We are pleased to announce that a new version of IDEforLaszlo is available. This version, 0.2.0, s ...