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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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>[SERVER-355] Capped collections go over the configured limits</title>
                <link>https://jira.mongodb.org/browse/SERVER-355</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;m creating a collection limited to 100MB of data:&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      col = @db.create_collection(host, { :capped =&amp;gt; true, :size =&amp;gt; 100_000_000 })&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      col.create_index &apos;invoked_at&apos;&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      col.create_index &apos;code&apos;&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
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&lt;p/&gt;

&lt;p&gt;Then I inserted 1,000,000 documents to see what would happen.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------  1 mike    wheel   67108864 Oct 13 14:06 web-analytics.0&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------  1 mike    wheel  134217728 Oct 13 14:10 web-analytics.1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------  1 mike    wheel  268435456 Oct 13 14:06 web-analytics.2&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------  1 mike    wheel  536870912 Oct 13 14:06 web-analytics.3&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------  1 mike    wheel   16777216 Oct 13 14:01 web-analytics.ns&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;Here&apos;s a listing of the collections and their document count within the web-analytics database:&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;system.indexes: 2&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;www.mikeperham.com: 735293&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;I was under the impression the million limit should mean bytes, not documents, so why is the entire database taking 800+MB on disk?&lt;/p&gt;</description>
                <environment>OSX 64-bit with Ruby 0.15.1 driver</environment>
        <key id="10740">SERVER-355</key>
            <summary>Capped collections go over the configured limits</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="eliot">Eliot Horowitz</assignee>
                                    <reporter username="mperham">Mike Perham</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Oct 2009 15:24:33 +0000</created>
                <updated>Sat, 17 Oct 2009 08:07:59 +0000</updated>
                            <resolved>Tue, 13 Oct 2009 15:33:59 +0000</resolved>
                                    <version>1.1.1</version>
                                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="10881" author="eliot" created="Tue, 13 Oct 2009 15:52:00 +0000"  >&lt;p&gt;if you run with --smallfiles (new in 1.1.2) and --notablescan  it will use less disk space&lt;/p&gt;</comment>
                            <comment id="10880" author="mperham" created="Tue, 13 Oct 2009 15:49:49 +0000"  >&lt;p&gt;Ok, I tested with a smaller cap and was able to verify that it doesn&apos;t go over a preset size.  The problem is that I&apos;ve limited it to 1MB and it is taking 80MB on disk.  That seems extreme but at least it works as designed.&lt;/p&gt;</comment>
                            <comment id="10877" author="eliot" created="Tue, 13 Oct 2009 15:33:59 +0000"  >&lt;p&gt;that&apos;s the allocated disk size.&lt;br/&gt;
MongoDB allocates extra space for various things.&lt;br/&gt;
the capping is on the collection, not the database&lt;/p&gt;</comment>
                            <comment id="10876" author="mperham" created="Tue, 13 Oct 2009 15:25:11 +0000"  >&lt;p&gt;Sorry, I haven&apos;t used JIRA in years and don&apos;t remember the formatting tags.&lt;/p&gt;</comment>
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