103 lines
6.8 KiB
HTML
103 lines
6.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Scenario: Change DST start or end due to time-sensitive programs" />
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<meta name="abstract" content="View this topic to learn how to avoid problems if you have time-sensitive programs scheduled to run during the time frame that daylight saving time (DST) either starts or ends." />
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<meta name="description" content="View this topic to learn how to avoid problems if you have time-sensitive programs scheduled to run during the time frame that daylight saving time (DST) either starts or ends." />
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<meta name="DC.Relation" scheme="URI" content="rzatiscenarios.htm" />
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<meta name="DC.Relation" scheme="URI" content="delaydstcurrenttimezone.htm" />
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<meta name="DC.Relation" scheme="URI" content="option2createnewtimezone.htm" />
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<meta name="DC.Relation" scheme="URI" content="rzatitimezone.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rzatidelaydst" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Scenario: Change DST start or end due to time-sensitive programs</title>
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</head>
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<body id="rzatidelaydst"><a name="rzatidelaydst"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Scenario: Change DST start or end due to time-sensitive programs</h1>
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<div><p>View this topic to learn how to avoid problems if you have time-sensitive
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programs scheduled to run during the time frame that daylight saving time
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(DST) either starts or ends.</p>
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<div class="section"><h4 class="sectionscenariobar">Situation</h4><p>Time-sensitive
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programs are scheduled to run during the hour that DST starts or ends. Because
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that hour is skipped or repeated, time-sensitive programs might encounter
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unpredictable results. The following conditions can occur:</p>
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<ul><li>Jobs might run twice; thus, unnecessarily impacting the performance of
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the system</li>
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<li>Jobs might not run at all; thus, work is not completed</li>
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<li>Programs might retrieve the wrong time value</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Objectives</h4><p>The
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DST start or end, depending on which is in effect, needs to be scheduled to
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occur during a different time frame. A different time frame is necessary because
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you have time-sensitive programs scheduled to run during the time frame specified
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for the current time zone.</p>
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<p>The objectives for this scenario are as follows:</p>
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<ul><li>To allow the time-sensitive programs to run as scheduled</li>
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<li>To either change the current DST start or end time to a time frame when
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no time-sensitive programs are scheduled to run</li>
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<li>To temporarily use a different time zone that has a DST start or end time
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frame that does not impact time-sensitive programs</li>
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</ul>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Details</h4><p>The system
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might encounter errors if a job is scheduled to run during an hour that is
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either skipped or repeated, or if a job is currently running, depending on
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whether you are starting or ending DST. For example, if DST begins at 2:00
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a.m., your system time moves forward 1 hour at 2:00 a.m. In this case, the
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system does not recognize the hour from 2:00 a.m. to 3:00 a.m. Time-sensitive
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jobs cannot be scheduled to run during this hour. The same situation applies
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to ending DST. You cannot schedule jobs during the hour that is repeated.</p>
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<p>If
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you change the DST to a time frame when no time-sensitive programs are scheduled
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to run, you can continue using the current time zone. However, you need to
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change the DST start or end time back to the original value after the DST
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goes into effect.</p>
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<p>If you create a new time zone based on the current
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time zone, you do not need to change the current time zone's DST properties.
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However, after the DST time change, you need to change the time zone system
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value back to the original time zone.</p>
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</div>
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<div class="section"><h4 class="sectionscenariobar">Recovery steps</h4><p>If
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you have jobs scheduled to run during the start or end of DST, you can delay
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DST or create a new time zone that uses different start and end times
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for DST. If you are using an IBM-supplied time zone, create a new time zone
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based on the supplied time zone. This ensures that you are not editing a time
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zone that is supplied with the system. Otherwise, delay DST by editing the
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time zone description.</p>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="delaydstcurrenttimezone.htm">Method 1: Delay DST for the current time zone</a></strong><br />
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One way to solve the problem of having jobs scheduled to run during the starting or ending of daylight saving time (DST) is to delay DST.</li>
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<li class="ulchildlink"><strong><a href="option2createnewtimezone.htm">Method 2: Create a new time zone with the proper DST values</a></strong><br />
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If you are using an IBM-supplied time zone, you can create a new time zone based on the supplied time zone to avoid the problem of having jobs scheduled during the starting or ending of daylight saving time (DST).</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzatiscenarios.htm" title="View this topic to learn about the different ways you can use time zones and time adjustments in time management. These scenarios describe a particular situation and task to complete.">Scenarios</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="rzatitimezone.htm" title="Use this information to understand the time zones that are included with the system and their properties. You can use one of the time zones included with the system or create your own.">Time zone</a></div>
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</div>
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</div>
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</body>
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</html>
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