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  • Performance Advice from a Mysterious Friend, Part 4

    April 9, 2008 Ted Holt

    I’ve already published three performance tips from one of your fellow subscribers, a consultant who has found these techniques to be helpful. Here’s tip number 4.

    Our friend’s advice: “Use journal cache support.”

    Journal caching is similar to file buffering. Caching directs the system to cache journal entries in main storage before flushing them to disk. You do not get journal caching automatically. It is a separately chargeable feature of i5/OS.

    The performance advantage is like that of buffering files. Normally the system writes a journal entry to the journal receiver before continuing with the next I/O operation. Caching allows the system to continue with the next I/O before the journal entry is written to disk.

    The V5R3 Information Center lists several advantages of journal caching and gives recommendations for when journal caching should and should not be used.

    RELATED STORIES

    Performance Advice from a Mysterious Friend, Part 3

    Performance Advice from a Mysterious Friend, Part 2

    Performance Advice from a Mysterious Friend



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Volume 8, Number 14 -- April 9, 2008
THIS ISSUE SPONSORED BY:

ProData Computer Services
WorksRight Software
Guild Companies

Table of Contents

  • Writing Secure PHP Applications
  • Use PCOMM Scripts to Execute Remote PC Commands, Part 1
  • Admin Alert: Things to Do When Adding Drives to a System
  • SQL Doesn’t Like Logical Files
  • Performance Advice from a Mysterious Friend, Part 4
  • Admin Alert: V6R1 Changes for the i5/OS Administrator, Part 1

Content archive

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