140 lines
8.2 KiB
HTML
140 lines
8.2 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<title>Additional considerations for SAVCHGOBJ</title>
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<body id="rzaiu127"><a name="rzaiu127"><!-- --></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">Additional considerations for SAVCHGOBJ</h1>
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<div><div class="section"><p>If you need to save changed objects as part of your save strategy,
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you must ensure that any partial save activity that occurs between your full
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save operations does not affect what you save with the SAVCHGOBJ command.
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If users occasionally save individual objects, you may want them to specify
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UPDHST(*NO). That prevents their save activity from having an impact on the
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overall SAVCHGOBJ strategy.</p>
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</div>
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<div class="section"> <div class="note"><span class="notetitle">Note:</span> The most common way to use the SAVCHGOBJ command is to specify
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REFDATE(*SAVLIB). If you have a new library that has never been saved, it
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is not saved when you specify SAVCHGOBJ REFDATE(*SAVLIB).</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Using SAVCHGOBJ–Example:</h4><p> In a typical environment,
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you might use the SAVLIB command once a week and the SAVCHGOBJ command every
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day. Because the default for SAVCHGOBJ is from the last SAVLIB operation,
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the media that the SAVCHGOBJ command produces tends to grow during the week.</p>
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</div>
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<div class="section"><p>What follows shows an example of using SAVCHGOBJ
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during a typical week. Assume that you save the entire library on Sunday
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night and the SAVCHGOBJ command is used each evening during the week:</p>
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</div>
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<div class="tablenoborder"><a name="rzaiu127__savchg"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzaiu127__savchg" width="100%" frame="hsides" border="0" rules="none"><caption>Table 1. SAVCHGOBJ Command:
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Cumulative</caption><thead align="left"><tr><th align="left" valign="bottom" width="20.13888888888889%" id="d0e34">Day</th>
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<th align="left" valign="bottom" width="29.86111111111111%" id="d0e36">Files That Changed That Day</th>
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<th align="left" valign="bottom" width="50%" id="d0e38">Media Contents</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e34 ">Monday</td>
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<td align="left" valign="top" width="29.86111111111111%" headers="d0e36 ">FILEA, FILED</td>
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<td align="left" valign="top" width="50%" headers="d0e38 ">FILEA, FILED</td>
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</tr>
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<tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e34 ">Tuesday</td>
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<td align="left" valign="top" width="29.86111111111111%" headers="d0e36 ">FILEC</td>
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<td align="left" valign="top" width="50%" headers="d0e38 ">FILEA, FILEC, FILED</td>
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</tr>
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<tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e34 ">Wednesday</td>
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<td align="left" valign="top" width="29.86111111111111%" headers="d0e36 ">FILEA, FILEF</td>
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<td align="left" valign="top" width="50%" headers="d0e38 ">FILEA, FILEC, FILED, FILEF</td>
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</tr>
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<tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e34 ">Thursday</td>
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<td align="left" valign="top" width="29.86111111111111%" headers="d0e36 ">FILEF</td>
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<td align="left" valign="top" width="50%" headers="d0e38 ">FILEA, FILEC, FILED, FILEF</td>
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</tr>
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<tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e34 ">Friday</td>
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<td align="left" valign="top" width="29.86111111111111%" headers="d0e36 ">FILEB</td>
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<td align="left" valign="top" width="50%" headers="d0e38 ">FILEA, FILEB, FILEC, FILED, FILEF</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><p>If a failure occurred on Thursday morning, you would: </p>
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</div>
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<div class="section"> <ol><li>Restore the library from Sunday evening.</li>
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<li>Restore all the objects from Wednesday's SAVCHGOBJ media volumes.</li>
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</ol>
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</div>
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<div class="section"><p>When you use this technique of saving everything that changed
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since the last SAVLIB, recovery is easier. You need to restore only the media
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volumes from the most recent SAVCHGOBJ operation.</p>
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</div>
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<div class="section"><p><strong><em>Changing the reference date and time:</em></strong> The default
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for the command is to save objects that have changed since the library was
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last saved using the SAVLIB command. You can specify a different reference
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date and time by using the reference date (REFDATE) and reference time (REFTIME)
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parameters on the SAVCHGOBJ command. This allows you to save only objects
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that have changed since the last SAVCHGOBJ operation. </p>
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</div>
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<div class="section"><p>This may reduce the amount of media and the time for the save
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operation. Here is an example:</p>
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</div>
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<div class="tablenoborder"><a name="rzaiu127__savchg1"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="rzaiu127__savchg1" width="100%" frame="hsides" border="0" rules="none"><caption>Table 2. SAVCHGOBJ Command–Not
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Cumulative</caption><thead align="left"><tr><th align="left" valign="bottom" width="20.13888888888889%" id="d0e107">Day</th>
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<th align="left" valign="bottom" width="29.745370370370374%" id="d0e109">Files That Changed That Day</th>
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<th align="left" valign="bottom" width="50.11574074074075%" id="d0e111">Media Contents</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e107 ">Monday</td>
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<td align="left" valign="top" width="29.745370370370374%" headers="d0e109 ">FILEA, FILED</td>
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<td align="left" valign="top" width="50.11574074074075%" headers="d0e111 ">FILEA, FILED</td>
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</tr>
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<tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e107 ">Tuesday</td>
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<td align="left" valign="top" width="29.745370370370374%" headers="d0e109 ">FILEC</td>
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<td align="left" valign="top" width="50.11574074074075%" headers="d0e111 ">FILEC</td>
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</tr>
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<tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e107 ">Wednesday</td>
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<td align="left" valign="top" width="29.745370370370374%" headers="d0e109 ">FILEA, FILEF</td>
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<td align="left" valign="top" width="50.11574074074075%" headers="d0e111 ">FILEA, FILEF</td>
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</tr>
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<tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e107 ">Thursday</td>
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<td align="left" valign="top" width="29.745370370370374%" headers="d0e109 ">FILEF</td>
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<td align="left" valign="top" width="50.11574074074075%" headers="d0e111 ">FILEF</td>
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</tr>
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<tr><td align="left" valign="top" width="20.13888888888889%" headers="d0e107 ">Friday</td>
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<td align="left" valign="top" width="29.745370370370374%" headers="d0e109 ">FILEB</td>
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<td align="left" valign="top" width="50.11574074074075%" headers="d0e111 ">FILEB</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section"><p>You can restore the SAVCHGOBJ media from earliest to latest.
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Or you can display each media volume and restore only the latest version of
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each object.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiurzaiu125.htm">Save only changed objects</a></div>
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</div>
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</div>
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</body>
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</html> |