Suggested Certification for AS 400

IBM Certified Specialist - AS/400
Recommended Book for AS 400

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Recommended Book 1 for AS 400

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Recommended Book 5 for AS 400

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Interview Questions and Answers

Commitment control (also known as transaction processing) ensures that a series of database operations are treated as a single unit of work. Either all changes are applied (committed), or none are (rolled back), guaranteeing data integrity.

AS/400 automatically manages file locking to prevent data corruption when multiple users or programs are accessing the same files. Different lock levels (e.g., shared, exclusive) can be specified to control access.

Journaling is a mechanism for tracking changes made to database files. Journal entries are recorded in a journal receiver, providing a history of data modifications that can be used for auditing or recovery purposes.

IBM i supports various networking protocols, including TCP/IP, SNA, and Ethernet. It can be integrated into existing network infrastructures and can act as a server or client for different network services.

Backup and recovery on IBM i typically involves using the Save/Restore (SAV/RST) commands. These commands allow you to save objects to tape or disk and restore them in case of system failures or data loss.

A physical file contains the actual data records. A logical file is a view or index over a physical file, providing different ways to access and organize the data without duplicating the data itself.

Data areas are named storage locations that can be used to share data between programs or to store system-wide variables. They provide a mechanism for inter-program communication.

You can debug RPG programs using the STRDBG (Start Debug) command, which allows you to step through the code, examine variables, and set breakpoints to identify and resolve errors.

You can access the AS/400 system via a 5250 terminal emulator, such as IBM i Access Client Solutions (ACS) or other third-party emulators. These emulators allow you to interact with the system using a text-based interface.

Libraries in AS/400 are containers used to organize and manage objects, such as programs, files, and data areas. They are similar to directories in other operating systems.

DDS is used to define the structure and attributes of physical and logical database files on IBM i. It specifies field names, data types, lengths, and relationships between fields.

Examples include: CRTCLPGM (Create CL Program), CRTPF (Create Physical File), DSPFD (Display File Description), WRKACTJOB (Work with Active Jobs), and CHGLIBL (Change Library List).

CL (Control Language) is the scripting language used to control operations and manage resources on the IBM i system. Its used for tasks such as job scheduling, system administration, and program control.

DB2 for i is the integrated database management system included with the IBM i operating system. Its a relational database known for its performance, security, and reliability.

IBM i incorporates a multi-layered security approach, including user profiles, object-level security, authorization lists, and auditing capabilities. Its known for its robust security features.

AS/400 was the original name for the system. iSeries was a later name, used before the current name, IBM i. They all refer to the same family of midrange computers.

ILE is a programming architecture that allows multiple programming languages (RPG, COBOL, C, C++) to be combined into a single application. This promotes code reuse and modularity.

AS/400, now known as IBM i, is a family of IBM midrange computers designed for business applications. It combines a robust operating system, integrated database, and security features, making it suitable for a wide range of industries.

Key features include an object-based architecture, integrated DB2 database, strong security, scalability, support for multiple programming languages (RPG, COBOL, Java, etc.), and virtualization capabilities.

RPG (Report Program Generator) is a high-level programming language traditionally used on IBM i systems for business applications. Modern RPG (RPG IV or ILE RPG) is a powerful and flexible language.

Application System Four Hundred.

A logical partition (LPAR) is a subset of a computer's hardware resources, virtualized as a separate computer. In effect, a physical machine can be partitioned into multiple logical partitions, each hosting a separate instance of an operating system.

QSYS.

A physical file can have a keyed sequence access path. This means that data is presented to a program in a sequence based on one or more key fields in the file. Logical files do not contain data. They contain a description of records found in one or more

Array is collection of elements of same data type. Ü Types of Array. 1) Compile time array. 2) Pre-runtime array. Compile time array, Pre-runtime array, and Run time array.

250 library names.

RGZPFM command is used to remove deleted records to make the space occupied by them available.

The Display Object Description (DSPOBJD) command.

Explain with examples that sync with the job description.

Explain with examples that sync with the job description.

Software testing is called the process or method of identifying errors in an application or system, such that the application works according to the requirement of end-users. It is an examination carried out to provide users the information on the qualit

The primary aim of the code review is to ensure that the codebase overall product quality is maintained over time. It helps give a fresh set of eyes to identify bugs and simple coding errors. All of the tools and processes of code review are designed to t

The most common software sizing methodology has been counting the lines of code written in the application source. Another approach is to do Functional Size Measurement, to express the functionality size as a number by performing Function point analysis.

The major parts to project estimation are effort estimation, cost estimation, resource estimate. In estimation, there are many methods used as best practices in project management such as-Analogous estimation, Parametric estimation, Delphi process, 3 Poin

Functional requirements are the specifications explicitly requested by the end-user as essential facilities the system should provide. Non-functional requirements are the quality constraints that the system must satisfy according to the project contract,

Quality control can be defined as a \"part of quality management concentrating on maintaining quality requirements.\" While quality assurance relates to how a process is carried out or how a product is produced, quality control is more the quality manage