Changing the Optimization Level. . . . . . . . . . . . . . . . . . . 87. . . . . .

Removing Observability . . . . . . . . . . . . . . 88. . . .

Reducing an Object's . Size. . . . . . . . . . . . . . . . . . . . . 88. . . . . .

Chapter 8.

Creating

a Service Program

. . . . . . . . . . . . . . . . .91. . . .

Service

Program

Overview. . . . . . . . . . . . . . . . . . . . . . .91

Strategies for Creating Service .Programs. . . . . . . . . . . . . . . . 92. . . . .

Creating a Service Program Using CRTSRVPGM. . . . . . . . . . . . . .92. . .

Changing A Service Program. . . . . . . . . . . . . . . . . . . . .93. . . . . .

Related CL commands . . . . . . . . . . . . . . . . . . . . . . . .93. . . . . .

Sample Service Program . . . . . . . . . . . . . . . . . . . . . . . .94. . . . . .

 

Creating

the

Service

Program. . . . . . . . . . . . . . . . . . . . .97

 

Binding

 

to

a

Program. . . . . . . . . . . . . . . . . . . . . . . . 98

 

Updating the Service Program. . . . . . . . . . . . . . . . . . . . 100

 

Sample

Binder

Listing. . . . . . . . . . . . . . . . . . . . . . . 100

 

Chapter

9.

Running

a

Program

 

 

. . . . . . . . . . . . . . . . . . . .103

 

Running

a

Program

Using

the

CL

CALL

Command. . . . . . . . . . . . .103. .

 

Passing

 

Parameters

using

the

CL

CALL

Command. . . . . . . . . . . 104. .

 

Running

a

Program

From

a

 

Menu-Driven

Application. . . . . . . . . . . .106. .

 

Running

a

Program Using a User-Created .Command. . . . . . . . . . .108. .

 

Replying to Run-Time Inquiry Messages. . . . . . . . . . . . . . . . .108. . . .

 

Ending

an

 

ILE

Program. . . . . . . . . . . . . . . . . . . . . . . .109

 

Managing

Activation

Groups. . . . . . . . . . . . . . . . . . . . . .109

 

Specifying an Activation Group. . . . . . . . . . . . . . . . . . . .110

 

Running

 

in the OPM Default Activation .Group. . . . . . . . . . . . 111. . .

 

Maintaining OPM RPG/400 and ILE RPG Program Compatibility. . . . . 111

 

Deleting an Activation Group. . . . . . . . . . . . . . . . . . . . 112

 

Reclaim Resources Command . . . . . . . . . . . . . . . . . . . .112

 

Managing Dynamically-Allocated Storage. . . . . . . . . . . . . . . . .113. . . .

 

Managing

the Default Heap Using RPG Operations. . . . . . . . . . . 113. .

 

Heap Storage Problems. . . . . . . . . . . . . . . . . . . . . . 118

 

Managing

Your

Own Heap

Using

ILE

Bindable. . .APIs. . . . . . . . 119. .

 

Chapter

10.

Calling

 

Programs

and

Procedures

 

 

 

. . . . . . . . . . . . .127. .

 

Program/Procedure Call Overview. . . . . . . . . . . . . . . . . . . .127

 

Calling Programs

 

. .

. .

. . . . . . . . . . . .128. . . .

 

Calling Procedures . .

 

. . . . . . . . . . . . . 128

 

The

Call

Stack. . . . . . . . . . . . . . . . . . . . . . . . . . .129

 

Recursive Calls . . . . . . . . . . . . . . . . 130

 

Parameter-Passing Considerations . . . . . . . . . . . 131

 

Using a Prototyped . Call. . . . . . . . . . . . . . . . . . . . . . .133

 

Using the CALLP Operation. . . . . . . . . . . . . . . . . . . . .133

 

Calling

within

an Expression. . . . . . . . . . . . . . . . . . . . .134

 

Examples

of

Free-Form

Call. . . . . . . . . . . . . . . . . . . . .135

 

Passing Prototyped Parameters. . . . . . . . . . . . . . . . . . . . 135

 

Parameter Passing Styles. . . . . . . . . . . . . . . . . . . . . .135

 

Using Operational Descriptors. . . . . . . . . . . . . . . . . . . . 138

 

Omitting Parameters .

. . . . . . . . . . . . . .139. . . .

 

Checking for the Number of Passed Parameters. . . . . . . . . . . . .141. .

 

Passing Less Data Than Required. . . . . . . . . . . . . . . . . . 145

 

Order of Evaluation. . . . . . . . . . . . . . . . . . . . . . . . .146

 

Interlanguage Calls . .

 

. . . . . . . . . . . . . 146

Interlanguage

Calling

Considerations. . . . . . . . . . . . . . . . . . 147

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Contents

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IBM AS/400 manual Chapter, Service Program
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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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