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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-22624] Why the journal is unnecessary for WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-22624</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I just want to know &lt;br/&gt;
Why the journal is unnecessary for WiredTiger&lt;/p&gt;</description>
                <environment>MongoDB 3.0</environment>
        <key id="265605">SERVER-22624</key>
            <summary>Why the journal is unnecessary for WiredTiger</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="nilap.shah@gmail.com">Nilap Shah</reporter>
                        <labels>
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                <created>Tue, 16 Feb 2016 07:40:36 +0000</created>
                <updated>Wed, 17 Feb 2016 00:16:15 +0000</updated>
                            <resolved>Wed, 17 Feb 2016 00:16:15 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1175021" author="ramon.fernandez" created="Wed, 17 Feb 2016 00:15:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nilap.shah%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;nilap.shah@gmail.com&quot;&gt;nilap.shah@gmail.com&lt;/a&gt;, please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;, where your question will reach a larger audience. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;. See also our &lt;a href=&quot;https://www.mongodb.org/about/support/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Support page&lt;/a&gt; for additional support resources.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1174787" author="alexander.gorrod" created="Tue, 16 Feb 2016 21:31:57 +0000"  >&lt;p&gt;WiredTiger uses a protocol called &lt;a href=&quot;https://en.wikipedia.org/wiki/Multiversion_concurrency_control&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MVCC&lt;/a&gt;, which means that we never overwrite data on disk. This allowed us to implement a mechanism called checkpointing that saves the state of a database at a particular point in time. Those checkpoints provide consistent durability guarantees similar to journaling.&lt;/p&gt;

&lt;p&gt;The difference between checkpointing and journaling is that it is much more expensive to create a checkpoint than it is to journal an operation. Which means checkpointing isn&apos;t a practical solution for applications that need to guarantee that updates are durable (i.e: available after a crash) soon after they are submitted.&lt;/p&gt;</comment>
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