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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-10756] Why is my mongodb dump so slow?</title>
                <link>https://jira.mongodb.org/browse/SERVER-10756</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I wanted to backup my database, and then execute the following command:&lt;/p&gt;

&lt;p&gt;mongodump  -d sandbox --out .&lt;/p&gt;

&lt;p&gt;But very, very slow&#12290;&lt;/p&gt;

&lt;p&gt;I saw the mongodb log, such a large number of logs:&lt;br/&gt;
Tue Sep 10 23:00:14 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn2409&amp;#93;&lt;/span&gt; getmore sandbox.followbrand_flwrs query: { query: {}, $snapshot: true } cursorid:7315171840358601840 ntoreturn:0 exhaust:1 keyUpdates:0 numYields: 3645 locks(micros) r:10464765 nreturned:6993 reslen:4194538 36678ms&lt;br/&gt;
Tue Sep 10 23:00:50 &lt;span class=&quot;error&quot;&gt;&amp;#91;conn2409&amp;#93;&lt;/span&gt; getmore sandbox.followbrand_flwrs query: { query: {}, $snapshot: true } cursorid:7315171840358601840 ntoreturn:0 exhaust:1 keyUpdates:0 numYields: 3602 locks(micros) r:10267399 nreturned:7015 reslen:4194822 35893ms&lt;/p&gt;

&lt;p&gt;The indexes is:&lt;/p&gt;

&lt;p&gt;&amp;gt; db.followbrand_flwrs.getIndexes()&lt;br/&gt;
[&lt;br/&gt;
	{&lt;br/&gt;
		&quot;v&quot; : 1,&lt;br/&gt;
		&quot;key&quot; : &lt;/p&gt;
{
			&quot;_id&quot; : 1
		}
&lt;p&gt;,&lt;br/&gt;
		&quot;ns&quot; : &quot;sandbox_qqonline.followbrand_flwrs&quot;,&lt;br/&gt;
		&quot;name&quot; : &quot;&lt;em&gt;id&lt;/em&gt;&quot;&lt;br/&gt;
	},&lt;br/&gt;
	{&lt;br/&gt;
		&quot;v&quot; : 1,&lt;br/&gt;
		&quot;key&quot; : &lt;/p&gt;
{
			&quot;update_time&quot; : 1
		}
&lt;p&gt;,&lt;br/&gt;
		&quot;ns&quot; : &quot;sandbox_qqonline.followbrand_flwrs&quot;,&lt;br/&gt;
		&quot;name&quot; : &quot;update_time_1&quot;&lt;br/&gt;
	}&lt;br/&gt;
]&lt;/p&gt;

&lt;p&gt;&amp;gt; db.followbrand_flwrs.count()&lt;br/&gt;
21579466&lt;/p&gt;</description>
                <environment>Debian GNU/Linux 6.0 2.6.32-5-amd64</environment>
        <key id="89713">SERVER-10756</key>
            <summary>Why is my mongodb dump so slow?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="dongwm">dongweiming</reporter>
                        <labels>
                            <label>performance</label>
                    </labels>
                <created>Fri, 13 Sep 2013 03:50:32 +0000</created>
                <updated>Wed, 10 Dec 2014 23:10:51 +0000</updated>
                            <resolved>Mon, 16 Sep 2013 08:40:24 +0000</resolved>
                                    <version>2.2.0-rc0</version>
                                                    <component>Performance</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="425814" author="dan@10gen.com" created="Mon, 16 Sep 2013 08:40:24 +0000"  >&lt;p&gt;mongodump scans your entire collection.  if the data is being paged in from disk, that can be a costly operation.  Check iostat to see if you are io bound.&lt;/p&gt;

&lt;p&gt;This project is for bugs or features, this is more of a support request, so probably should go to stackoverflow or google groups.  &lt;a href=&quot;https://groups.google.com/forum/#!forum/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/#!forum/mongodb-user&lt;/a&gt;&lt;/p&gt;</comment>
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