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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[DOCS-5939] Deletions Equal the Same Amount of Data as Inserts</title>
                <link>https://jira.mongodb.org/browse/DOCS-5939</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;I&apos;m running into issues with replication lag due to low IOPS (which can&apos;t change in my use case) so I&apos;m analysis my data ingest algorithm to try and limit the number and size of operation in the OpLog.  &lt;/p&gt;

&lt;p&gt;According to the documentation here: &lt;a href=&quot;http://docs.mongodb.org/manual/core/replica-set-oplog/#deletions-equal-the-same-amount-of-data-as-inserts&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/replica-set-oplog/#deletions-equal-the-same-amount-of-data-as-inserts&lt;/a&gt;. Which states: &quot;If you delete roughly the same amount of data as you insert, the database will not grow significantly in disk use, but the size of the operation log can be quite large.&quot;  I interrupt that statement to mean that deletions can use as much oplog space as inserts.  However, when I run a test and watch the oplog, a deletion in the oplog is only a instruction to remove the _id from the collection.  I&apos;m not sure how this is comparable to an insert which could be up to a 16MB document.  &lt;/p&gt;

&lt;p&gt;Yes I&apos;m aware that removing multiple documents in 1 command can produce multiple oplog entries but that should be covered in &lt;a href=&quot;http://docs.mongodb.org/manual/core/replica-set-oplog/#updates-to-multiple-documents-at-once&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/replica-set-oplog/#updates-to-multiple-documents-at-once&lt;/a&gt; : &quot;The oplog must translate multi-updates into individual operations in order to maintain idempotency. This can use a great deal of oplog space without a corresponding increase in data size or disk use.&quot;&lt;/p&gt;

&lt;p&gt;Please let me know if i&apos;m missing something in my test or if the documentation needs to be updated.&lt;/p&gt;</description>
                <environment></environment>
        <key id="223573">DOCS-5939</key>
            <summary>Deletions Equal the Same Amount of Data as Inserts</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="AndrewDoumaux">Andrew Doumaux</reporter>
                        <labels>
                            <label>oplog</label>
                    </labels>
                <created>Fri, 31 Jul 2015 13:06:00 +0000</created>
                <updated>Mon, 30 Oct 2023 21:43:19 +0000</updated>
                            <resolved>Tue, 1 Nov 2022 11:02:11 +0000</resolved>
                                    <version>mongodb-3.0</version>
                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4943641" author="edu.bot" created="Tue, 1 Nov 2022 11:02:08 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="84111" name="oplog.txt" size="366" author="AndrewDoumaux" created="Fri, 31 Jul 2015 13:06:00 +0000"/>
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