JCL: What is EXCP ?

 

EXCP stands for EXecute Channel Program. These are the I/O subsystem hardware driverprograms that do the actual data transfer between the DASD (Hard disk) and the system memory(core/RAM). Channels in mainframes are similar to Buses in the PCs. They are basically the electrical paths to carry data. So each time a trip is made to the DASD to fetch data, EXCP count goes up by one. This is the reason we say a job is looping if the EXCP count is not increasing. Note that the count goes up by one for each block of data transferred. So a data transfer of a single 4K block and a single 32K block will count for one EXCP each.
There is a little caveat here. If the data being fetched is in a DB2 table, the EXCP count will NOT go up even though large amounts of data are being transferred. That is because the EXCPs are logged by a part of MVS called SMF (Systems Management Facility) while DB2 I/Os are handled by MMF (Media Manager Facility). So those I/Os don’t show up on the EXCP reports.

JCL: What is EXCP的更多相关文章

  1. erlang调试之JCL

    Job control mode (JCL), in which jobs can be started, stopped, detached or connected. Only the curre ...

  2. Delphi JCL JEDI使用 jclDebug

    开源 https://github.com/project-jedi/jcl jclDebug 下载jcl,还要下载https://github.com/project-jedi/jedi里的2个in ...

  3. JCL笔记

    本文转自<http://leowzy.iteye.com/blog/888931> ---------------------------------------------------- ...

  4. JCL学习

    JCL基本概念 定义:job control language 用户与操作系统的接口,用户通过JCL语句按照自己的意图来控制作业的执行. JOB的概念:把大机要实现的每一项任务,称为一个JOB或作业. ...

  5. Log4j、Log4j 2、Logback、SFL4J、JUL、JCL的比较

    Log4j.Log4j 2.Logback.SFL4J.JUL.JCL的比较 之前就知道有好几种日志框架,但是一直都是听别人讲,在什么时候该用何种logger,哪种logger比较好……一直对Log4 ...

  6. 3.Java日志框架slf4j、jcl、jul、log4j1、log4j2、logback大总结

    一.slf4j.jcl.jul.log4j1.log4j2.logback JUL:JDK中的日志记录工具,也常称为JDKLog.jdk-logging. LOG4J1:一个具体的日志实现框架. LO ...

  7. 常见java日志系统的搭配详解：关于slf4j log4j log4j2 logback jul jcl commons-logging jdk-logging

    先看一张图: 是不是有点晕, 晕就对了.这个仅仅是 slf4j 的情况,实际上, 我们不仅要接触到 slf4j ,有时候还会接触其他的日志系统.且看下文分解. 1 直接使用各个日志系统 1.1 直接使 ...

  8. Java 日志体系（二）jcl 和 slf4j

    Java 日志体系(二)jcl 和 slf4j <java 日志体系(一)统一日志>:https://www.cnblogs.com/binarylei/p/9828166.html &l ...

  9. 安装JVCL/JCL组件

    在安装的时候,注意要先安装JCL,我试图直接安装JVCL,提示找不到文件,先安装JCL后再安装就不存在这个问题.安装到组件面板上的安装包以D结尾,可以Install,以R结尾的只要编译就可以了. 安装 ...

随机推荐

  1. 汕头市队赛SRM 20 T2不净的圣杯

    不净的圣杯 SRM 20 背景 作为一张BUG级别的卡,官方打算把它修改得人畜无害一些…… 虽然名字还没想好,但是能力大概是对敌方所有单位造成d点伤害,d为自己牌组中所有卡的编号的最大公约数.这无疑是 ...

  2. vue-cli proxyTable中跨域中pathRewrite 怎么用

    问:proxyTable 里面的pathRewrite里面的‘^/iclient’:'' 什么意思? 答:用代理, 首先你得有一个标识, 告诉他你这个连接要用代理. 不然的话, 可能你的 html, ...

  3. 无缝衔接demo

    如题. <!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" con ...

  4. AlertDialog.Builder 显示为白色 蓝色字

    AlertDialog.Builder dialog = new AlertDialog.Builder( getActivity(),AlertDialog.THEME_HOLO_LIGHT);

  5. LINUX-内核-中断分析-中断向量表（3）-arm【转】

    转自:http://blog.csdn.net/haolianglh/article/details/51986987 arm中断概念 在<ARM体系结构与编程>第9章中说到,ARM 中有 ...

  6. 文字顺时针旋转90度（纵向）&古诗词排版

    1.文字旋转90度 width: 100px; height: 200px; line-height: 100px; text-align: center; writing-mode: vertica ...

  7. 使用Webpack搭建Vue项目

    前提: 1.  借助Node.js环境里的npm来安装, 2.  设置好npm镜像, (比如淘宝的npm镜像:输入 引用 npm install -g cnpm –registry=https://r ...

  8. ado中dispose和close的区别，摘自网络

    Close() and Dispose() are basically the same thing on an ADO.NET connection object for providers shi ...

  9. Mysql安装发生「Access denied for user ‘root’@’localhost’ (using password: NO)」错误

    参考:http://www.aipacommander.com/entry/2014/05/26/152247 mysql_secure_installation 依赖重置密码

  10. node起server--axios做前端请求----进行CORS--跨域请求

    CORS是一个W3C标准,全称是"跨域资源共享"(Cross-origin resource sharing). 它允许浏览器向跨源服务器,发出XMLHttpRequest请求,从 ...