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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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<item>
            <title>[SERVER-36343] Encountering error Btree::insert: key too large to index when deleting a document</title>
                <link>https://jira.mongodb.org/browse/SERVER-36343</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We are facing the error &quot;Btree::insert: key too large to index&quot; when trying to delete a document, and the document is not deleted with success. I know that this error is caused by the index entry for this document exceeds index key limit, as described in the doc: &lt;a href=&quot;https://docs.mongodb.com/manual/reference/limits/#Index-Key-Limit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/limits/#Index-Key-Limit&lt;/a&gt;&#160;.&lt;/p&gt;

&lt;p&gt;My question is that why this document was inserted into the database without error. As the document &lt;a href=&quot;https://docs.mongodb.com/manual/reference/limits/#Index-Key-Limit&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/limits/#Index-Key-Limit&lt;/a&gt;&#160; says, inserting this document to the mongodb should be failed.&#160;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="579419">SERVER-36343</key>
            <summary>Encountering error Btree::insert: key too large to index when deleting a document</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="nick.brewer">Nick Brewer</assignee>
                                    <reporter username="kzhang@appcelerator.com">Kefeng Zhang</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Jul 2018 09:19:23 +0000</created>
                <updated>Mon, 30 Jul 2018 15:15:07 +0000</updated>
                            <resolved>Mon, 30 Jul 2018 15:15:07 +0000</resolved>
                                    <version>2.6.5</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1960223" author="nick.brewer" created="Mon, 30 Jul 2018 15:14:32 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kzhang%40appcelerator.com&quot; class=&quot;user-hover&quot; rel=&quot;kzhang@appcelerator.com&quot;&gt;kzhang@appcelerator.com&lt;/a&gt; As mentioned in the link you&apos;ve provided, the change to more strictly enforce the index key limit size during document creation was introduced in MongoDB 2.6 - if the document was added in an older version, and then you attempted to remove it on 2.6, it would explain the behavior you&apos;re seeing. &lt;/p&gt;

&lt;p&gt;That said, MongoDB 2.6 became EOL in &lt;a href=&quot;https://www.mongodb.com/support-policy&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;October 2016&lt;/a&gt;, so I strongly recommend that you upgrade to a supported version. If you&apos;re still encountering this behavior on a supported version, feel free to update this ticket and I&apos;ll re-open it for you. &lt;/p&gt;

&lt;p&gt;-Nick&lt;/p&gt;
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