Computer operation influence factors

这是一份关于编程语言的使用说明概述以及计算机运行影响因素的描写。记忆，是计算机内存在运行计算速度过程中的一个非常重要的角色，所有程序运行都需要有足够的内存来执行。系统决定了多少资源，如处理器和存储，以此满足目标。工作量管理将不断监控系统和适应处理，以满足目标。

1. Explain the use of the ampersand (&) character when making JCL / PROCs variable and flexible.
If an &-variable is immediately followed by a % variable (that is, there is no intervening termination character), a compound variable is formed. A compound variable is also formed if an &-variable immediately follows a ?-variable. Any string that begins with && is not substituted. This is because the double ampersand within JCL is usually used to denote a temporary data set. Any such strings are unaffected by the variable substitution.

      2. Explain what documentation might be needed by the staff of computer operators.
Code Samples
AIO Sample code, APPC Sample Code, Diagnotic tools, Network Computing, OS/390 Security Setup Sample Code
Performance Tools
Base SAS, Candle Command Center for OS/390, JinsightLive for IBM System z, MXG, Report Generator for Hardware Instrumentation Sample Data, SOLVE:Netmaster for TCP/IP v4.0, Resource Measurement Facility, IBM C/C++ Productivity Tools for OS/390
Ported Tools
Apache, ACE, atools, autoconf, bash, bison, bzip2, cpost, diffutils, emacs, findutils, flex, gmake, gnats, GNU grep, groff, gzip, host, hostname, id-utils, ksh93, less, libtool, lynx, m4, nedit, openssh, openssl, patch, perl, PGP, PHP, rcs, sha, the, vim, unzip, webalizer, zip
UNIX Tools
auditid, booksrvcar, Bruno's Bag of Tools, bpxget, bpxput, bpxstop, bpxwdyn, bpxwtabs, cksparse, colonies, COBOL compile environment, db2pb, db2imsrx, describe, dirsize, execsql, ext, fduse, finuse, fsadmin, fscp, fsinuse, fsq, fsview, getuids, ICS2WLM, IOSSPOFD, i, ifind, ihsCMT, IPLSTATS, isu, Java OMTA, KEYXFER, libascii, makedep, mcp, MSGLG610, MVSJob, odb2, oeconsol, oesvp, omvstape, ORACOMP, PAV Analysis Tool, passwd, pdsdir, perr, pschart, rac, rangelks, readmvs and writemvs, rexxfunc, rexx compiler utility, RTOOLS, sdsf, seff, setstack, stat, startd, submit, submit2, SVC analyzer, sysout, tcpcfg, tsocmd, USStools, uurestore, viascii, view, websearch, wjsfsmon, wjsigshl, wjssh, zFS Large Directory Utility, zfsspace, zlsof

     3. Describe two (2) features of the zOS Operating system.
Compatibility: 
compatible with all kinds of hardware and software, as well as nearly all operating system.
Conservation：
When hardware or software is accessed from different sources simultaneously, it can automatically protect itself.
IBM markets z/OS as its flagship operating system, suited for continuous, high-volume operation with high security and stability.

    4. Describe workload management.
With z/OS Workload Management (WLM), you define performance goals and assign a business importance to each goal. You define the goals for work in business terms, and the system decides how much resource, such as CPU or storage, should be given to it to meet the goal. Workload Management will constantly monitor the system and adapt processing to meet the goals.

   5. Describe I/O and data management and why it is important to speed processing.
I/O is an abbreviation for input/output, that is, input and output ports. Each device has a  dedicated I/O addresses to handle its own input and output information.  The connection between CPU and memory   and external devices      and data exchange rely on the interface device.
Data is physical symbols stored in certain media and can be identified .   Data consists of two aspects: one is the data that describes the characteristics of something; the second is data that is stored in a certain medium. Data management technology is the technology  about classification, organization, coding, datastorage, retrieval and maintenance of data.
Factors that determine the speed process of a computer :
CPU frequency, that is, CPU clock frequency on anormal work, theoretically the higher the clock speed of the CPU, the  faster is the computer, because with higher frequencies, more units of the instructionsper clock cycle can be completed, so the speed is faster.
Memory, memory in a computer is playing a very important role in speed process, all programs running in yourcomputer require memory to perform. 
And in return, the speed of CPU and memory depends on the the speed of I/O and data management, so it is important to speed processing.