Changing a Module or Program

level again afterwards to improve the program efficiency as you get ready for production.

To determine the current optimizatiprongramlevelobject,of a use the DSPPGM command. Display 3 of this command indicates the current level. To chang optimization level of a program, use the CHGPGM command. On the Optimize program parameter you can specify one the following values: *FULL, *BASIC, *NONE. These are the same values which can be specified on the OPTIMI parameters of either create command. The program is automatically re-cr when the command runs.

Similarly, to determine the current optimizationmodule, leveluse ofthe a DSPMOD

command. Display 1, page 2 of this command indicates the current level change the optimization level, use the CHGMOD command. You then need to create the program either using UPDPGM or CRTPGM.

Removing Observability

Observability

involves

the

kinds

of

data

 

that

can

be

stored

with

an

o

allow

the

object

to

be changed without recompiling the source. The

ad

data

increases

the

size of the object. Consequently, you may

want

to

data

in order to reduce object

size.

But

once

the

data

is

removed

also

removed.

You

must

recompile

the

source

and

recreate

the

program

the

data.

The

types

of

data

are:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Create

Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Represented

by the *CRTDTA value. This data is necessary to

t

 

 

the

code

to

machine

instructions.

The

object

must

have

this

d

 

 

you

can

change

the

optimization

level.

 

 

 

 

 

 

 

 

 

 

Debug Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Represented

by the *DBGDTA value. This data is necessary to

 

 

object

to

be

debugged.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Profiling

Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Represented

by the *BLKORD and *PRCORD values. This data is

ne

 

 

essary to allow the system to re-apply block order and

proced

 

 

profiling

data.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Use

the

CHGPGM

command

or

the

CHGMOD

command

to

remove

some

or

all

the

data

from

a

program

or module respectively. Removing all observability r

object

to

its

minimum

size (without compression). It is not possible to

object in any way unless you re-create it.

Therefore,

ensure

that

y

source

required

to

create

the

program

 

or

have

a

comparable

program

 

CRTDATA.

To

re-create

it,

you

must

 

have

authorization

to

access

the

so

Reducing an Object's

Size

 

 

 

 

 

The

create

data

(*CRTDTA)

associated with an ILE program

or module

may

up

more than half of the object's size. By removing or

compressing

th

will

reduce

the

secondary

storage requirements for your

programs signi

If you remove the data, ensure that you have all source required t program or have a comparable program object with CRTDATA. Otherwise you not be able to change the object.

88 ILE RPG for AS/400 Programmer's Guide

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IBM AS/400 manual Removing Observability, Size, Reducing an Objects
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AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.
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