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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-28] Clarify what can be lost on a server crash</title>
                <link>https://jira.mongodb.org/browse/DOCS-28</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;It is not clear entirely what can be lost in case of a mongod crash &amp;#8211; is it just the unwritten data or is it possible to lose already written data too? It&apos;s not clear from &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Durability+and+Repair&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Durability+and+Repair&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="12137">DOCS-28</key>
            <summary>Clarify what can be lost on a server crash</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="chx">Karoly Negyesi</reporter>
                        <labels>
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                <created>Sat, 12 Jun 2010 22:53:51 +0000</created>
                <updated>Mon, 15 Aug 2011 19:11:56 +0000</updated>
                            <resolved>Sun, 13 Jun 2010 13:05:53 +0000</resolved>
                                                                        <due></due>
                            <votes>1</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="14703" author="chx" created="Sat, 12 Jun 2010 23:16:46 +0000"  >&lt;p&gt;I have changed the page per Eliot&apos;s comment. This ticket now can be closed.&lt;/p&gt;</comment>
                            <comment id="14702" author="eliot" created="Sat, 12 Jun 2010 23:01:41 +0000"  >&lt;p&gt;Will let kyle fix the website, but the answers below.&lt;/p&gt;

&lt;p&gt;On a mongod crash, only the last few second should be lost.&lt;br/&gt;
The system will still flush other changes.&lt;/p&gt;

&lt;p&gt;On a system crash or power outage, there is potential to lose anything.&lt;br/&gt;
In practice its rare to lose more than a few seconds, but possible.&lt;/p&gt;

&lt;p&gt;1.8 will have full durability.&lt;br/&gt;
see: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-980&quot; title=&quot;single server durability&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-980&quot;&gt;&lt;del&gt;SERVER-980&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="14701" author="redspider" created="Sat, 12 Jun 2010 22:57:26 +0000"  >&lt;p&gt;Specifically, we&apos;re interested both in what can happen if mongo crashes yet the system continues to run, and what happens if the system dies from a power outage. The question arises due to anecdotal evidence that suggests that more than just the last few records disappear under certain circumstances, specifically large update operations.&lt;/p&gt;</comment>
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