93 lines
6.2 KiB
HTML
93 lines
6.2 KiB
HTML
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<meta name="DC.Title" content="Eliminating save-outage time: Overview" />
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<meta name="abstract" content="This information tells you what happens when you use the save-while-active function to eliminate your save-outage time." />
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<title>Eliminating save-outage time: Overview</title>
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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">Eliminating save-outage time: Overview</h1>
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<div><p>This information tells you what happens when you use the save-while-active
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function to eliminate your save-outage time. </p>
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<p>The save-while-active function can eliminate your outage for particular
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save operations by not waiting for applications to end before starting the
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save procedure. However, you will have more complex and longer recovery procedures
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after restoring objects from the media.</p>
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<p>You will have more complex recovery procedures because eliminating your
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save-outage time saves objects at different application boundaries. For save-while-active
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purposes, an <span class="uicontrol">application boundary</span> is a point in time:</p>
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<ul><li>When all of the objects that a particular application is dependent upon
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are at a consistent state in relationship to each other.</li>
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<li> When the objects are also in a state where you can start or restart the
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application.</li>
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</ul>
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<p>When you choose to eliminate your save-outage time, applications can update
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the objects you are saving before the objects reach a checkpoint. When this
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happens the server cannot determine if the images of those objects reached
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application boundaries when you restore those objects. Therefore at restore
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time, you need to define recovery procedures to bring those objects to a common
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application boundary. You will need these recovery procedures to bring the
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objects to a consistent state in relationship to each other. For this reason
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you should protect the objects you are saving with journaling or commitment
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control.</p>
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<p>Furthermore, if you do not use commitment control, partial transactions
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can be saved without your knowledge. When you use commitment control, you
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can choose to have the save operation save all objects at transaction boundaries.
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However, if applications do not reach commitment boundaries within the specified
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time, the save operation will fail.</p>
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<p> You should consider each of the following when you determine these recovery
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procedures: </p>
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<ul><li>If the objects that the applications are dependent on consist entirely
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of database files or if they depend on other object types such as integrated
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file system objects.</li>
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<li>If the objects that the applications are dependent on are in a single
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library or span multiple libraries.</li>
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<li>If the objects that the applications are dependent on are journaled objects.</li>
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<li>If the changes the applications made to the objects are under commitment
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control.</li>
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</ul>
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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="rzaiurzaiu300.htm" title="The save-while-active function allows you to use your server during all or part of the save process, that is, save your server while it is active.">Save your server while it is active</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="rzaiurzaiu311.htm" title="How your save-while-active function fits into your backup and recovery strategy depends on whether you will reduce or eliminate your save-outage time. These pages contain information to help you decide how you will use the save-while-active function. It also contains pages with technical descriptions of the save-while-active function.">Save-while-active and your backup and recovery strategy</a></div>
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<div><a href="rzaiurzaiu365.htm">Considerations for recovery procedures after eliminating save-outage time</a></div>
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<div><a href="rzaiurzaiu347.htm">Example: Restore libraries after reducing save-outage time</a></div>
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</div>
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<div class="reltasks"><strong>Related tasks</strong><br />
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<div><a href="rzaiurzaiu358.htm">Recommended recovery procedures after eliminating save-outage time</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzaiurzaiu348.htm" title="Use the save-while-active function to eliminate your save-outage time.">Eliminate your save-outage time</a></div>
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</div>
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</div>
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</body>
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