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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>
    </build-info>


<item>
            <title>[SERVER-7092] Delete by query is really slow </title>
                <link>https://jira.mongodb.org/browse/SERVER-7092</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Trying to delete approx 8m of a 21million collection, its taking ages &amp;amp; appears to be very slow.&lt;/p&gt;

&lt;p&gt;I am running a js file locally on server (mongo localhost:27018 remove.js) that contains:&lt;br/&gt;
collection.remove({&apos;dts&apos;:{&apos;$gte&apos;:ISODate(&apos;2012-06-21T00:00:00Z&apos;)}});&lt;/p&gt;

&lt;p&gt;I only have two indexes.&lt;br/&gt;
one on _id.&lt;br/&gt;
one on above date field &amp;amp; id.&lt;/p&gt;

&lt;p&gt;Disk I/O is maxxed out at 100%, please see attached iostat file.&lt;/p&gt;

&lt;p&gt;I have an MMS account, please let me know what further details you need if you can look at it, the server is currently running the delete operation.&lt;/p&gt;

&lt;p&gt;I also have another shard that I am also doing a delete on, but instead trying out with &lt;br/&gt;
var c = collection.find({&apos;dts&apos;:{&apos;$gte&apos;:ISODate(&apos;2012-06-21T00:00:00Z&apos;)}}, &lt;/p&gt;
{&apos;_id&apos;:1}
&lt;p&gt;); &lt;br/&gt;
and &lt;br/&gt;
c.forEach(function (id) { cursor.remove({_id: id._id});})&lt;/p&gt;

&lt;p&gt;It&apos;s also maxxing out I/O at 100% with a very slow return on deletes/sec.&lt;/p&gt;

&lt;p&gt;Is there a recommended way to delete a large quantity of items?&lt;br/&gt;
Am I doing something blatantly wrong?&lt;/p&gt;
</description>
                <environment>ubuntu 12.04, &lt;br/&gt;
Hardware: Intel(R) Xeon(R) CPU E5606 @ 2.13GHz&amp;#39;, 2133MHz, 4 Core, Sockets: 2	&lt;br/&gt;
RAM:	32230MB&lt;br/&gt;
RAID:	Level 10 Disks:	4	 Size:	1849GB	Type:	SATA</environment>
        <key id="51040">SERVER-7092</key>
            <summary>Delete by query is really slow </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="9">Done</resolution>
                                        <assignee username="stephen.lee">Stephen Lee</assignee>
                                    <reporter username="steve@buzznumbershq.com">Steven Casey</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Sep 2012 07:31:04 +0000</created>
                <updated>Fri, 8 Mar 2013 15:56:03 +0000</updated>
                            <resolved>Fri, 28 Sep 2012 14:10:48 +0000</resolved>
                                    <version>2.0.7</version>
                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="169205" author="stephen.lee@10gen.com" created="Fri, 28 Sep 2012 14:10:48 +0000"  >&lt;p&gt;Steven, if you continue experience performance issues, please reopen this ticket or create a new one.&lt;/p&gt;</comment>
                            <comment id="166781" author="stephen.lee@10gen.com" created="Fri, 21 Sep 2012 16:48:43 +0000"  >&lt;p&gt;I looked at MMS, and the lock % looks pretty reasonable considering the 8M removes.&lt;/p&gt;

&lt;p&gt;Sharding doesn&apos;t allow us to rename collections, so &lt;tt&gt;db.collection.remove()&lt;/tt&gt; might be the only way to go.&lt;/p&gt;

&lt;p&gt;For a standalone or replica set instance, since 8M removes might introduce a lot of fragmentation, it might be better to copy the documents matching, {&lt;tt&gt;&apos;dts&apos;:{&apos;$lt&apos;:ISODate(&apos;2012-06-21T00:00:00Z&apos;)&lt;/tt&gt;}} into a new collection, recreate the indexes on the new collection, drop the old collection, and rename the new collection to the old collection&apos;s name.&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&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-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;// copy documents we want to keep&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;db.collection.find( {&apos;dts&apos;:{&apos;$lt&apos;:ISODate(&apos;2012-06-21T00:00:00Z&apos;)}} ).forEach( function( x ) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;    db.new.insert( x );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;} );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;// create indexes on new collection&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;db.collection.getIndexes().forEach( function( i ) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;    db.new.ensureIndex( i.key );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;} );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;db.new.renameCollection( db.collection.getName(), dropTarget: true );&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="166652" author="steve@buzznumbershq.com" created="Fri, 21 Sep 2012 10:19:11 +0000"  >&lt;p&gt;To try and rule out the hardware as the cause, i ran hdparm (closed down mongo first):&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;hdparm -t /dev/vda&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;/dev/vda:&lt;br/&gt;
 Timing buffered disk reads: 700 MB in  3.00 seconds = 232.97 MB/sec&lt;/p&gt;</comment>
                            <comment id="166628" author="steve@buzznumbershq.com" created="Fri, 21 Sep 2012 07:39:09 +0000"  >&lt;p&gt;server1: sp-a1&lt;br/&gt;
server2: sp-a2&lt;/p&gt;

&lt;p&gt;MMS Group name: Buzz Numbers&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="20159" name="iostat_-xmdh_2.txt" size="2615" author="steve@buzznumbershq.com" created="Fri, 21 Sep 2012 07:31:04 +0000"/>
                            <attachment id="20160" name="mongostat_server1.txt" size="5656" author="steve@buzznumbershq.com" created="Fri, 21 Sep 2012 07:33:51 +0000"/>
                            <attachment id="20161" name="mongostat_server2.txt" size="7040" author="steve@buzznumbershq.com" created="Fri, 21 Sep 2012 07:33:51 +0000"/>
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