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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-63727] Optimize inserts for unique indexes that don&apos;t have old format keys</title>
                <link>https://jira.mongodb.org/browse/SERVER-63727</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63577&quot; title=&quot;Ensure that new unique indexes don&amp;#39;t have old format keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63577&quot;&gt;&lt;del&gt;SERVER-63577&lt;/del&gt;&lt;/a&gt;, we will know definitively when a unique index contains only new-format keys.&lt;/p&gt;

&lt;p&gt;This means we can skip &lt;a href=&quot;https://github.com/mongodb/mongo/blob/46ff463ec5608f17b6243899eb12535ec98b5dc8/src/mongo/db/storage/wiredtiger/wiredtiger_index.cpp#L588-L612&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this code&lt;/a&gt; that inserts and deletes a key every time we check for a duplicate.&lt;/p&gt;

&lt;p&gt;This will significantly speed up inserts in two ways:&lt;br/&gt;
1. We don&apos;t have to perform this extra insert and delete&lt;br/&gt;
2. We can avoid performance issues with performing search_near when a lot of keys are not visible. See &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8150&quot; title=&quot;Poor search near performance if a lot of data are invisible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8150&quot;&gt;&lt;del&gt;WT-8150&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1984595">SERVER-63727</key>
            <summary>Optimize inserts for unique indexes that don&apos;t have old format keys</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
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                <created>Wed, 16 Feb 2022 14:15:22 +0000</created>
                <updated>Tue, 6 Dec 2022 00:31:26 +0000</updated>
                            <resolved>Fri, 25 Feb 2022 11:17:59 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4376537" author="louis.williams" created="Fri, 25 Feb 2022 11:17:24 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yuhong.zhang&quot; class=&quot;user-hover&quot; rel=&quot;yuhong.zhang&quot;&gt;yuhong.zhang&lt;/a&gt;, you&apos;re completely right. Thanks for clarifying. I think the comments about upgrading threw me off. Since that is true, I don&apos;t think there&apos;s anything improvement we can make in MongoDB. I&apos;m going to instead link to &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8431&quot; title=&quot;Increase test_hs14 cache size to reduce eviction activity&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8431&quot;&gt;&lt;del&gt;WT-8431&lt;/del&gt;&lt;/a&gt; which describes the performance problem with many invisible updates.&lt;/p&gt;</comment>
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