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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-7981] How insert (write) operations happens in MongoDB.</title>
                <link>https://jira.mongodb.org/browse/SERVER-7981</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;What is the exact sequence of write and read operations in MongoDB?&lt;br/&gt;
When we are loading data, which is insert(write) operations, the data will be written to memory or disk???&lt;/p&gt;</description>
                <environment>linux, ubuntu</environment>
        <key id="59878">SERVER-7981</key>
            <summary>How insert (write) operations happens in MongoDB.</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="krisant007">Santosh Kumar L</reporter>
                        <labels>
                            <label>SERVER_V2</label>
                            <label>insert</label>
                            <label>shard</label>
                            <label>writes</label>
                    </labels>
                <created>Wed, 19 Dec 2012 12:43:57 +0000</created>
                <updated>Sat, 9 Jul 2016 21:09:30 +0000</updated>
                            <resolved>Wed, 19 Dec 2012 13:04:04 +0000</resolved>
                                    <version>2.2.0</version>
                                                    <component>Index Maintenance</component>
                    <component>Sharding</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="220306" author="krisant007" created="Thu, 20 Dec 2012 14:15:41 +0000"  >&lt;p&gt;Thanks Eliot Horowitz for the information.&lt;br/&gt;
This link helped me in understanding the inner details better.&lt;/p&gt;</comment>
                            <comment id="219212" author="eliot" created="Wed, 19 Dec 2012 13:03:58 +0000"  >&lt;p&gt;Can also read more here:&lt;br/&gt;
&lt;a href=&quot;http://blog.mongodb.org/post/33700094220/how-mongodbs-journaling-works&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://blog.mongodb.org/post/33700094220/how-mongodbs-journaling-works&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="219211" author="eliot" created="Wed, 19 Dec 2012 13:03:24 +0000"  >&lt;p&gt;The order of operations is roughly)&lt;br/&gt;
1) applied in memory&lt;br/&gt;
2) applied to oplog&lt;br/&gt;
3) applied to journal file&lt;br/&gt;
4) journal fsynced&lt;br/&gt;
5) applied to data files&lt;/p&gt;

&lt;p&gt;The relevant get last error params are&lt;br/&gt;
w=2 - don&apos;t acknowledge write complete till its on a secondary&lt;br/&gt;
j=true - don&apos;t acknowledge write until its in the journal and fsynced&lt;/p&gt;</comment>
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