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    <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>[DOCS-224] State explicit formulas for index related stuff</title>
                <link>https://jira.mongodb.org/browse/DOCS-224</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The docs ought to include formulas for calculating the sizes of various index-related things:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;the sizes of compound index keys (this changed from v0 to v1 indexes)&lt;/li&gt;
	&lt;li&gt;the estimated size of an index based on the number and average size of index keys&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Eliot says that v0 index keys are BSON objects with empty keys, so the key size should be 4 + &amp;lt;number of fields&amp;gt; + &amp;lt;sizes of fields&amp;gt; + 1. If all the fields are fixed size (e.g., numbers/booleans/ObjectIds/Dates/Timestamps), then all index keys should be the same size.  For any variably sized scalar field (e.g., string/binary/etc.), the size of the field includes a 4-byte length and typically an extra byte (null byte for strings, subtype for binary.&lt;/p&gt;

&lt;p&gt;Anyway, this is a start.&lt;/p&gt;</description>
                <environment></environment>
        <key id="41257">DOCS-224</key>
            <summary>State explicit formulas for index related stuff</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="-1">Unassigned</assignee>
                                    <reporter username="richard.kreuter">Richard Kreuter</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Jun 2012 15:04:22 +0000</created>
                <updated>Mon, 30 Oct 2023 22:36:37 +0000</updated>
                            <resolved>Wed, 27 Jul 2016 17:34:35 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1337970" author="emily.hall" created="Wed, 27 Jul 2016 17:34:35 +0000"  >&lt;p&gt;Closed for housekeeping on 7/27/2016 by Emily Hall. &lt;br/&gt;
If you require additional support, please open a new ticket for prioritization. &lt;br/&gt;
Thanks,&lt;br/&gt;
Emily&lt;/p&gt;</comment>
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            <issuekey id="58618">DOCS-859</issuekey>
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