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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>[SERVER-80410] Improve &quot;Index key pattern too large&quot; error message when more than 32 fields used in creating a compound index</title>
                <link>https://jira.mongodb.org/browse/SERVER-80410</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In most recent MongoDB releases (e.g. 5.0+), &quot;&lt;font color=&quot;#DE350B&quot;&gt;Index key pattern too large&lt;/font&gt;&quot; error message will be received if there are more than 32 fields when creating a compound index. This is due to documented limit in &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/limits/#mongodb-limit-Number-of-Indexed-Fields-in-a-Compound-Index&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Number of Indexed-Fields in a Compound Index&lt;/a&gt;.&lt;br/&gt;
&#160;&lt;br/&gt;
For example, if running the &lt;font color=&quot;#DE350B&quot;&gt;createIndex&lt;/font&gt; command from  &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/471464/471464_createindex-toolarge.nosql&quot; title=&quot;createindex-toolarge.nosql attached to SERVER-80410&quot;&gt;createindex-toolarge.nosql&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; file, it will fail with an error message &quot;...&lt;font color=&quot;#DE350B&quot;&gt;caused by :: Index key pattern too large&lt;/font&gt;&quot;.&lt;/p&gt;

&lt;p&gt;The error message is not obvious to a user who run the create index command what goes wrong and often the user will mistakenly think the other limit 1024 byte index limit which has been resolved since 4.2. This can cause confusion. &lt;/p&gt;

&lt;p&gt;We can improve the error message to be more direct and explicit, like &quot;&lt;font color=&quot;#DE350B&quot;&gt;caused by :: Index keys (fields) exceeded the limit (32) for the number of indexed fields&lt;/font&gt;&quot; or something similar.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2426277">SERVER-80410</key>
            <summary>Improve &quot;Index key pattern too large&quot; error message when more than 32 fields used in creating a compound index</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="james.lin@mongodb.com">James Lin</reporter>
                        <labels>
                            <label>car-qw</label>
                    </labels>
                <created>Thu, 24 Aug 2023 23:00:55 +0000</created>
                <updated>Fri, 3 Nov 2023 06:56:56 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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