Performance Tuning

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Revision as of 07:00, 13 June 2005 by Al Mac (talk | contribs) (Application Software Review)
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This is one of the things you might look at while trouble shooting Degradation, but in fact ought to check periodically, to avoid a problem developing and not being spotted. Doubtless someone may update this article to reflect improvements in IBM eServers in later models. The reality of what is needed will vary greatly by what you have on your 400 hardware, in terms of system load, and which version of OS/400 or i5/OS.

Al Mac has similar notes at work in FIXTUNING, an SEU "document." Some of the terminology used by Al Mac may not be the correct stuff ... instead sometimes Al Mac has assigned names to a technique learned, or figured out outside formal 400 education, and not known what name would be better.

Brain Overload

This is a collection of complicated topics that can take a while to wrap our mind around and thoroughly "Grok", so pick one area, study it, leave the others alone, until ready to move on to something else.

Choices

Errors and other Clues

Communications Lines

Data Base Monitor

File hit Maximum records

Data File
Spool File

Messages Management

Application Software Review

Batch Considerations

CPU Intensive

Blocking

CPU Sharing

Call Frequency

Data Slicing

Debug

Disk Access

Logicals

Access Path Sharing

Dimensions

Backup Management

System Values

Allocations

Active Jobs

Automatic System Tuning

Cache vs. Bottlenecks

Task Scheduling

Other Resources

Books and Manuals