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<channel>
    <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-23605] 100% CPU usage in update one field in one document</title>
                <link>https://jira.mongodb.org/browse/SERVER-23605</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a simple social crawler written in C# for testing MongoDB performance and decide - use it in another projects.&lt;br/&gt;
It collected 750.000 documents in collection Post.&lt;br/&gt;
Document post have &quot;IsApproved&quot; property that I want to update.&lt;/p&gt;

&lt;p&gt;Posts collection have _id index and &lt;/p&gt;
{
    &quot;SiteId&quot; : 1,
    &quot;IsApproved&quot; : -1,
    &quot;Date&quot; : -1
}

&lt;p&gt;I make project to find one with &lt;/p&gt;
{Id, IsApproved}
&lt;p&gt; and UpdateOne with !Approved (see screenshot).&lt;/p&gt;

&lt;p&gt;Inserting documents fine and my Azure VM (D2 (2 cores Xeon with SSD) CPU costs about 2-8 percent.&lt;br/&gt;
But if I press approve button in my crawler - it &quot;think&quot; 3-5 seconds and costs 40% CPU. &lt;br/&gt;
If i press Approve button multiple times without pause - it kill my server and CPU load at 99% for each update time (see screenshot).&lt;br/&gt;
Don&apos;t say than i need be toggle boolean property with XOR command  - i approximate it to other updates and i worry.&lt;/p&gt;

&lt;p&gt;How I will use database, that only one update costs so many CPU times ?&lt;br/&gt;
It&apos;s not normal behaviour. Maybe that index rebuild ?&lt;/p&gt;</description>
                <environment>Azure VM D2 size</environment>
        <key id="278227">SERVER-23605</key>
            <summary>100% CPU usage in update one field in one document</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="zoxexivo@gmail.com">Ivan Artemov</reporter>
                        <labels>
                            <label>query</label>
                    </labels>
                <created>Thu, 7 Apr 2016 16:56:02 +0000</created>
                <updated>Tue, 22 Feb 2022 12:06:57 +0000</updated>
                            <resolved>Mon, 11 Apr 2016 12:44:38 +0000</resolved>
                                    <version>3.2.3</version>
                                                    <component>WiredTiger</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4367981" author="JIRAUSER1265020" created="Tue, 22 Feb 2022 12:06:57 +0000"  >&lt;p&gt;I am facing issue. I am streaming stock trades from from alpaca but issue that db usage 100% during streaming&lt;/p&gt;

&lt;p&gt;my system spceicification:&lt;/p&gt;

&lt;p&gt;Instance type: t3.xlarge&lt;br/&gt;
RAM: 16GB&lt;br/&gt;
CPU: 4&lt;br/&gt;
Operating system: Ubuntu 20.04&lt;/p&gt;

&lt;p&gt;Kindly let me know system requirement for above task. bellow is my piece of code&lt;/p&gt;


&lt;p&gt;await models.Stocks.updateOne({ symbol: trade.Symbol }, [{&lt;br/&gt;
&#160; &#160; &#160;$set: &lt;/p&gt;
{
&#160; &#160; &#160; &#160; &#160; &#160;las t_price: \{ $toDouble:&quot;$price&quot; }
&lt;p&gt;,&lt;br/&gt;
&#160; &#160; &#160; &#160; &#160; &#160;price: { $toDouble: trade.Price },&lt;br/&gt;
&#160; &#160; &#160; &#160; &#160; difference_price_number: { $toDouble: { $subtract: [&lt;/p&gt;
{ $toDouble:&quot;$last_price&quot; }
&lt;p&gt;, { $toDouble: trade.Price }] } },&lt;br/&gt;
&#160; &#160; &#160; &#160; &#160;difference_price_percentage: { $toDouble: { $abs: { $toInt: { $multiply: [{ $divide: [{ $toDouble: { $subtract: [&lt;/p&gt;
{ $toDouble:&quot;$last_price&quot; }
&lt;p&gt;, {&#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; &#160; $toDouble:&quot;$price&quot; }] } }, { $toDouble:&quot;$price&quot; }] }, 100] } } } },&lt;br/&gt;
last_update_price_date:newDate()&lt;br/&gt;
}&lt;br/&gt;
}])&lt;br/&gt;
console.log(`trades updated on ${new Date()}`);&lt;/p&gt;</comment>
                            <comment id="1231746" author="thomas.schubert" created="Mon, 11 Apr 2016 12:44:38 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ZOXEXIVO&quot; class=&quot;user-hover&quot; rel=&quot;ZOXEXIVO&quot;&gt;ZOXEXIVO&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;You may be interested in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19153&quot; title=&quot;Conditionally push $match before $project&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19153&quot;&gt;&lt;del&gt;SERVER-19153&lt;/del&gt;&lt;/a&gt;, which tracks the aggregation optimization to reorder &lt;tt&gt;project&lt;/tt&gt; and &lt;tt&gt;match&lt;/tt&gt; stages in circumstances like this. Feel free to vote for it and watch it for updates. Until this optimization is implemented, I would recommend following Robert&apos;s suggestion.&lt;/p&gt;

&lt;p&gt;Thank you for your help identifying the cause of this behavior,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1231734" author="zoxexivo@gmail.com" created="Mon, 11 Apr 2016 12:35:16 +0000"  >&lt;p&gt;Robert, Thank you!&lt;br/&gt;
I come to MongoDB from EntityFramework just now and i will be carefully with LINQ syntax. &lt;br/&gt;
But in the future, i think, it need to be optimized with Linq Expression priorities, because many people will try to work with Mongo and catch that problems.&lt;br/&gt;
I think, this issue can be closed. Thanks for all !&lt;/p&gt;</comment>
                            <comment id="1231613" author="zoxexivo@gmail.com" created="Mon, 11 Apr 2016 08:44:06 +0000"  >&lt;p&gt;Thomas, can you move this issue to C# Driver ? Server works ok, but C# driver work as not expected&lt;/p&gt;</comment>
                            <comment id="1231434" author="rstam" created="Mon, 11 Apr 2016 01:11:22 +0000"  >&lt;p&gt;LINQ queries are &lt;b&gt;always&lt;/b&gt; executed as aggregation framework commands.&lt;/p&gt;

&lt;p&gt;But now that we see what the LINQ query got converted to it is obvious what the problem is. The resulting aggregation framework query pipeline requires a full collection scan. The reason is that it does a projection before a match so no index can be used (the server does not rearrange the order of the pipeline).&lt;/p&gt;

&lt;p&gt;The LINQ query can be easily rewritten so that it generates an efficient aggregation framework pipeline:&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;var postStatus = collection.AsQueryable()&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;    .Where(x =&amp;gt; x.Id == postId)&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;    .Select(x =&amp;gt; new { x.Id, x.IsApproved })&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;   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;    .FirstOrDefault();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The resulting aggregation framework pipeline now is:&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;    [0]: {{ &quot;$match&quot; : { &quot;_id&quot; : CSUUID(&quot;00000000-0000-0000-0000-000000000000&quot;) } }}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    [1]: {{ &quot;$project&quot; : { &quot;Id&quot; : &quot;$_id&quot;, &quot;IsApproved&quot; : &quot;$IsApproved&quot;, &quot;_id&quot; : 0 } }}&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;   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;    [2]: {{ &quot;$limit&quot; : 1 }}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The important change is to filter before projecting.&lt;/p&gt;

&lt;p&gt;Since the $match stage is now before the $project stage the server would be able to use an index to execute the pipeline more efficiently.&lt;/p&gt;</comment>
                            <comment id="1231386" author="zoxexivo@gmail.com" created="Sun, 10 Apr 2016 21:34:00 +0000"  >&lt;p&gt;Hello, Thomas. I find problem!&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;   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;var postStatus = await collection.AsQueryable().Select(x =&amp;gt; new { x.Id, x.IsApproved }).FirstOrDefaultAsync(x =&amp;gt; x.Id == postId);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;convert to&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;&quot;query&quot; : {&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;                &quot;aggregate&quot; : &quot;Posts&quot;,&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;                &quot;pipeline&quot; : [ &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;&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;                        &quot;$project&quot; : {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                            &quot;Id&quot; : &quot;$_id&quot;,&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;                            &quot;IsApproved&quot; : &quot;$IsApproved&quot;,&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;                            &quot;_id&quot; : 0&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;&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;&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;&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;                        &quot;$match&quot; : {&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;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I think it is not standart behaviour and we need ask C# Driver developer, why it convert to aggregate query.&lt;br/&gt;
Thank you!&lt;/p&gt;</comment>
                            <comment id="1230901" author="zoxexivo@gmail.com" created="Fri, 8 Apr 2016 22:43:06 +0000"  >&lt;p&gt;I attach 2 screenshots with system monitors. iostat not available on Windows, but we have Perfrormance Monitor&lt;/p&gt;</comment>
                            <comment id="1230492" author="thomas.schubert" created="Fri, 8 Apr 2016 17:29:00 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ZOXEXIVO&quot; class=&quot;user-hover&quot; rel=&quot;ZOXEXIVO&quot;&gt;ZOXEXIVO&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for reporting this issue. So we can continue to investigate, can you please provide the complete logs for the affected server?&lt;/p&gt;

&lt;p&gt;Additionally, can you please execute the following shell script:&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;
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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;delay=1&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;iostat -k -t -x ${delay:?} &amp;gt;iostat.log &amp;amp;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This script will collect iostat data each second, and will help us to correlate the CPU numbers to events recorded in the diagnostic.data. &lt;/p&gt;

&lt;p&gt;After running this script and reproducing this issue, please upload both the iostat.log and the contents of the diagnostic.data to this ticket.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Thomas &lt;/p&gt;</comment>
                            <comment id="1229341" author="zoxexivo@gmail.com" created="Thu, 7 Apr 2016 16:58:26 +0000"  >&lt;p&gt;Indexes on Posts collection.&lt;br/&gt;
I drop compound index with IsApproved and nothing... Still 3-5 secods to update&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="117121" name="1.png" size="50732" author="zoxexivo" created="Fri, 8 Apr 2016 22:43:46 +0000"/>
                            <attachment id="116821" name="1.png" size="14561" author="zoxexivo" created="Thu, 7 Apr 2016 16:56:02 +0000"/>
                            <attachment id="116822" name="2.png" size="47510" author="zoxexivo" created="Thu, 7 Apr 2016 16:56:02 +0000"/>
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                            <attachment id="116825" name="5.png" size="27851" author="zoxexivo" created="Thu, 7 Apr 2016 16:58:26 +0000"/>
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                            <attachment id="117119" name="Screenshot.png" size="145124" author="zoxexivo" created="Fri, 8 Apr 2016 22:42:24 +0000"/>
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