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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-3260] Prefix Indexes</title>
                <link>https://jira.mongodb.org/browse/SERVER-3260</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be great if we could specify indexes that only index on the prefix of a field. i.e. for BinData on the first n bytes, for strings on the first n characters, etc. This might not work on all data types but it is a great tool for trimming index sizes when applicable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="18266">SERVER-3260</key>
            <summary>Prefix Indexes</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="bdarfler">Benjamin Darfler</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Jun 2011 15:20:30 +0000</created>
                <updated>Tue, 6 Dec 2022 05:43:10 +0000</updated>
                                                                            <component>Index Maintenance</component>
                                        <votes>17</votes>
                                    <watches>31</watches>
                                                                                                                <comments>
                            <comment id="1569063" author="budulianin" created="Thu, 11 May 2017 16:01:38 +0000"  >&lt;p&gt;Hey guys, when will you implement this feature?&lt;br/&gt;
This ticket was created 3 years ago!&lt;br/&gt;
How can I do prefix search now? Use regex?&lt;/p&gt;</comment>
                            <comment id="697051" author="sallgeud" created="Wed, 20 Aug 2014 17:25:44 +0000"  >&lt;p&gt;This would allow for several benefits:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;more configurable and useful indexes&lt;/li&gt;
	&lt;li&gt;less memory and/or disk space requirements for indexes&lt;/li&gt;
	&lt;li&gt;higher performance indexing&lt;/li&gt;
	&lt;li&gt;higher performance sorting&lt;/li&gt;
	&lt;li&gt;potentially reduce indexing time on document save&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="697049" author="sallgeud" created="Wed, 20 Aug 2014 17:24:30 +0000"  >&lt;p&gt;See our related one. Since 2.6 this has become far more important. I think under nearly all circumstances we would limit every text field we index to something fairly small.&lt;/p&gt;</comment>
                            <comment id="515355" author="mdcallag" created="Thu, 13 Mar 2014 17:12:03 +0000"  >&lt;p&gt;This will help with long index keys. Pre-2.6 behavior is to let insert/update succeed and skip index maintenance when the index key is too long. This is bad for index scans that will miss the unindexed doc. 2.6 changed the server to raise an error and make the insert/update fail. This makes the index correct but will be a problem for some existing apps.&lt;/p&gt;

&lt;p&gt;Prefix keys are the solution.&lt;/p&gt;</comment>
                            <comment id="512801" author="charity@parse.com" created="Mon, 10 Mar 2014 19:21:13 +0000"  >&lt;p&gt;Any plans to implement this soon?  It would really help ease the transition to a world where keys too large to index don&apos;t get inserted.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="153838">SERVER-14974</issuekey>
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            <issuekey id="150786">SERVER-14784</issuekey>
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            <issuekey id="155500">SERVER-15090</issuekey>
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