AS/400 中的数据区域的简介

Data Areas

Data areas is  a type of system object that you can create，which used to communicate and store data used by several programs either within a job or between jobs.

According to store the data , we can divide the data area to the following classes:

1.This data area contains a decimal value.(*DEC )

2.This data area contains a character string value.(*CHAR)

3.This data area contains a logical value of either one (1) or zero (0) that can be used to represent two opposing conditions such as on/off, true/false, or yes/no. (*LGL)

4.The data area being created is a DDM data area.  The data area contains the name of the remote data area accessed and the name of the remote (target) system that the data area is located on.(*DDM )

Local Data Area

The local data area is associated with a server job and cannot be accessed from another job. Therefore, you cannot create or delete the local data area. When the server job ends, the local data area associated with that server job is automatically deleted, and the LocalDataArea object that is referring to the job is no longer valid. You should also note that local data areas are a fixed size of 1024 characters on the server.