CICS Component

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#transactions #system #table #processing #terminal #application

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本文介绍了CICS系统的组成，包括管理模块、系统表格、控制块和系统数据集等核心组件。管理模块负责处理终端I/O、文件I/O及程序加载等任务；系统表格存储有关终端、文件和应用程序的信息；控制块用于跟踪当前正在处理的交易状态；系统数据集用于记录交易日志、系统恢复等。

CICS Component

1. Management modules

User programs interface management modules to handle terminal I/O, file I/O, program loading and control, and access to other system resources.

2. Tables

The management module use CICS system tables to obtain information about the terminals, files, and applications programs that are part of the CICS system. The table are loaded into storage when CICS system is started and remain active until the system is shut down.

l Program Control Table (PCT)

l Processing Program Table (PPT)

l File Control Table (FCT)

l Terminal Control Table (TCT)

l Temporary Storage Table (TST)

l Destination Control Table (DCT)

3. Control blocks

The management modules create control blocks to keep track of the status of all transactions that are currently being processed. The control blocks are released when no longer needed. (i.e. when the task leaves the system).

l Common System Area (CSA)

l Task Control Area (TCA)

l EXEC Interface Block (EIB)

4. System data sets

The management modules and application programs use the CICS system data sets for transaction logging, system recovery, and storing processing results that are needed by other transactions or application programs.