本文转自:http://www.binaryintellect.net/articles/165bb877-27ee-4efa-9fa3-40cd0cf69e49.aspx When you make any additions, modifications and deletions to an Entity  Framework DbSet and call SaveChanges(), EF starts a new transaction and executes  all the IN…

In some cases it may be necessary to enlist participants that aren't two-phase commit aware into a two-phase commit transaction. If there is only a single resource then there is no need for two-phase commit. However, what if there are multiple resour…

［抄题］: 接口:int read4(char * buf)一次从文件中读取 4 个字符.返回值是实际读取的字符数. 例如,如果文件中只剩下 3 个字符,则返回 3.通过使用read4 接口,实现从文件读取 n 个字符的函数int read(char * buf,int n). [暴力解法]: 时间分析: 空间分析: ［思维问题］: ［一句话思路］: buffer是缓冲区,buf是缓存. ［输入量］:空: 正常情况:特大:特小:程序里处理到的特殊情况:异常情况(不合法不合理的输入): ［画图］:…

档 ID 420787.1 White Paper Oracle Applications Multiple Organizations Access Control for Custom Code Checked for relevance on 12-JAN-2011 See Change Record This document discusses how to update the customization code that is affected by the access con…

问: I would like know what is the best possible way to implement transactions with DBContext. In particular, Does DbContext.SaveChanges implement transaction internall if i change multiple entities? If i want to call DbContext.SaveChanges multiple tim…

一直没有好好关注这个功能,昨天看了一下,数据库插入有瓶颈,今天研究了一下: 主要有以下方案: 1.使用copy从文件导入: copy table_001(a, b, "f", d, c, "e") from 'd:/data1.txt' (delimiter ','); 速度极快: 不带索引: 查询成功: 共计 69971 行受到影响,耗时: 4351 毫秒(ms).        查询成功: 共计 69971 行受到影响,耗时: 4971 毫秒(ms).     …

小结: 1.innodb支持XA事务: 2.XA协议作为资源管理器(数据库)与事务管理器的接口标准: 3.提交或者回滚的点:必须所有的组件被提交或者被回滚: 4.2阶段 PC-1,TM告知所有RM要准备提交,各个RM汇报是否准备好:PC-2,如果所有RM准备好,则TM告知所有RM提交:否则如果有RM未准备好,则TM告知所有RM回滚. 5.1阶段 当只有一个RM时,2阶段提交退化为one-phase commit 1阶段提交. XA的Mysql实现是通过在全局事务中扮演资源管理者RM角色来处理XA…

转自:http://www.ibm.com/developerworks/lotus/library/rft-api/index.html The Rational GUI automation tool has a wonderful recorder feature that records a user's activities and automatically generates code that simulates these activities. You can then im…

http://www.codeproject.com/Articles/89858/WCF-Concurrency-Single-Multiple-and-Reentrant-and Introduction and goalIn this article, we will concentrate on WCF concurrency and throttling. We will first try to understand what is WCF concurrency and the t…

So far in this chapter,I have shown you different ways to create services,how to expose a service endpoint and metadata exchange endpoint,how to generate client proxies,how to work with metadata,and how to configure service behaviors. In this section…