DATABASES Signal 124
IBM i (OS/400) the Database Operating System
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An article revisits IBM i (formerly OS/400), an operating system where the relational database is built into the kernel and everything is an object rather than a file, tracing its architecture from the 1988 AS/400 to the current IBM Power platform.
IBM i represents a fundamentally different systems engineering approach where the OS and database are a single unit, eliminating the communication overhead between separate layers. For engineers accustomed to bolting a database onto Linux or Windows, this architecture shows that native kernel-level understanding of data structures yields concrete advantages in OLTP performance, security through encapsulation, and binary compatibility spanning decades.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
Db2 for i is integrated directly into the OS kernel below the machine interface level, so authorization, space management, and record locking operate at the lowest, most efficient layer rather than in a competing external process.
The system rejects the Unix 'everything is a file' model in favor of objects with strict headers and encapsulation, which prevents direct manipulation of compiled programs and blocks viruses or malicious scripts from overwriting executable code.
The TIMI (Technology Independent Machine Interface) abstraction layer decouples applications from hardware, allowing a program written in 1990 to run natively on current IBM Power servers without recompilation or rewriting.
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