Integrated File System - IBM i series Handbook

the performance of other users. Before the query is started, its run time is estimated, and
if the estimate exceeds the specified time limit, the query is not started.
Ease of Use and Management
The iSeries' reputation for usability and maintainability is unsurpassed in the industry. This is
due in part to the tight integration of OS/400 and DB2 UDB for iSeries. Users do not have to
learn separate operating system and database functions, nor are they burdened with
maintaining the complex interfaces between multiple layers of software. In addition to
seamless integration, a rich set of utilities continue to be provided for easy management of
DB2 UDB for iSeries databases. Some of these utilities include:
• Online backup and restore: Allows database maintenance to be performed while
users are accessing and changing the database, providing around-the-clock
operation.
• Object level recovery: Allows restoration of a single file when necessary; it is not
necessary to restore the entire database to "fix" a single file.
• Roll forward and backward recovery: Allows database changes made after the last
backup to be reapplied after a restore, or recent changes to be backed out if the
database needs to be returned to a specific state. This can be done for a specific user,
time, or job.
• Audit trail: Maintains a record of database changes such as the user, program, and job
making the change.

Integrated File System

The Integrated File System is a part of OS/400 that lets you support stream input, output, and
storage management similar to personal computer and UNIX operating systems. A file
system provides the support to access specific segments of storage that are organized as
logical units. These logical units on the iSeries server are files, directories, libraries, and
objects.
Each file system has a set of logical structures and rules for interacting with information in
storage. These structures and rules may be different from one file system to another. In fact,
from the perspective of structures and rules, the OS/400 support for accessing database files
and various other object types through libraries can be thought of as a file system. Similarly,
the OS/400 support for accessing documents (which are really stream files) through the
folders structure may be thought of as a separate file system.
The Integrated File System treats the library and folders support as separate file systems.
Other types of file management support that have differing capabilities are also treated as
separate file systems. The file systems are:
Operating System/400 (5722-SS1)
Operating System/400 (5722-SS1)
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