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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-1153] Create an in-memory only storage engine</title>
                <link>https://jira.mongodb.org/browse/SERVER-1153</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongo is already a performance leader, but it would be great to push this farther via an option for storage entirely within ramspace like an Oracle In-Memory Database or MySQL memory table (aka. heap table)&lt;/p&gt;

&lt;p&gt;This would also need to turn off the disk-space pre-allocation; with storage in RAM you would not need any pre-allocation since re-allocating additional space would be an almost instant task.&lt;/p&gt;

&lt;p&gt;I have created a hack for this that works but even with nssize=2 and smallfiles set the default disk pre-allocation makes my setup rather limited in use.&lt;br/&gt;
&lt;a href=&quot;http://www.phpmoadmin.com/mongodb-in-memory-database&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.phpmoadmin.com/mongodb-in-memory-database&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="12023">SERVER-1153</key>
            <summary>Create an in-memory only storage engine</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="phpmoadmin">phpMoAdmin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 May 2010 15:49:02 +0000</created>
                <updated>Wed, 22 Mar 2017 15:27:56 +0000</updated>
                            <resolved>Mon, 9 Nov 2015 22:58:52 +0000</resolved>
                                                    <fixVersion>3.2.0-rc2</fixVersion>
                                    <component>Storage</component>
                                        <votes>101</votes>
                                    <watches>92</watches>
                                                                                                                <comments>
                            <comment id="1083864" author="geert.bosch" created="Mon, 9 Nov 2015 22:58:52 +0000"  >&lt;p&gt;The enterprise build contains a new in-memory storage engine for production use.  It is currently in beta and is available in the enterprise build since 3.2.0-rc2.  To enable, use &lt;tt&gt;&amp;#45;&amp;#45;storageEngine inMemory&lt;/tt&gt;.  More documentation coming soon in the release notes for v3.2. &lt;/p&gt;

&lt;p&gt;The enterprise server is openly available for free trial and development. You may use it in development / eval without a commercial license (&lt;a href=&quot;https://www.mongodb.com/lp/download/mongodb-enterprise&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/lp/download/mongodb-enterprise&lt;/a&gt;). &lt;/p&gt;

&lt;p&gt;For the watchers of this ticket who are looking for a non-persistant storage engine for testing purposes, we have provided a storage engine for this use case in the community build.  Use &lt;tt&gt;&amp;#45;&amp;#45;storageEngine ephemeralForTest&lt;/tt&gt; to enable an in-memory solution which supports collection level locking. As the name of this option suggests, do not use it in production.&lt;/p&gt;</comment>
                            <comment id="1077317" author="xgen-internal-githook" created="Mon, 2 Nov 2015 21:33:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: Add Evergreen testing for inMemory storage engine&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/70c5435a48b5a8e8c6559371b1136ecdca0d49ae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/70c5435a48b5a8e8c6559371b1136ecdca0d49ae&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1077314" author="xgen-internal-githook" created="Mon, 2 Nov 2015 21:33:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: Initial integration for in-memory storage engine based on WT&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/880f81a1196341d8ddbb7e3253d7eb24b4be1cc9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/880f81a1196341d8ddbb7e3253d7eb24b4be1cc9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1077267" author="xgen-internal-githook" created="Mon, 2 Nov 2015 20:59:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;michaelcahill&apos;, u&apos;name&apos;: u&apos;Michael Cahill&apos;, u&apos;email&apos;: u&apos;michael.cahill@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: Add and use isEphemeral predicate&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ae3a6452d208f848d54f7808ac22229a228665c5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ae3a6452d208f848d54f7808ac22229a228665c5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1062911" author="xgen-internal-githook" created="Fri, 16 Oct 2015 15:31:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;monkey101&apos;, u&apos;name&apos;: u&apos;Dan Pasette&apos;, u&apos;email&apos;: u&apos;dan@10gen.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: Initial commit of inMemory storage engine&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit e0001f87181b6b195760ccd872e719a399475778.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/06358579119d7920d14269216f83797a5352def2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/06358579119d7920d14269216f83797a5352def2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1062469" author="sallgeud" created="Fri, 16 Oct 2015 04:20:35 +0000"  >&lt;p&gt;The fact that it&apos;s enterprise only, given how high it&apos;s been rated among everyone is more curious than the notifications, Tim &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="1061254" author="timn" created="Thu, 15 Oct 2015 08:23:54 +0000"  >&lt;p&gt;It&apos;s rather frustrating to even be bothered by notifications about commits to a non-publicly accessible repository that implements a feature that obviously many (on the open source or academic side) need &amp;#8211; to say the least.&lt;/p&gt;</comment>
                            <comment id="1060960" author="xgen-internal-githook" created="Wed, 14 Oct 2015 22:22:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;PLW&apos;, u&apos;name&apos;: u&apos;Paul Pedersen&apos;, u&apos;email&apos;: u&apos;paul@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: Initial commit of inMemory storage engine&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/e0001f87181b6b195760ccd872e719a399475778&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/e0001f87181b6b195760ccd872e719a399475778&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1059529" author="xgen-internal-githook" created="Tue, 13 Oct 2015 20:04:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert.bosch@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: Rename to inMemory storage engine&lt;br/&gt;
Branch: artree&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/a688dba787f46d9f078414b3781ba50f7e31f5f4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/a688dba787f46d9f078414b3781ba50f7e31f5f4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1057013" author="sallgeud" created="Fri, 9 Oct 2015 21:05:45 +0000"  >&lt;p&gt;It&apos;s becoming a trend that all of the mostly highly demanded features are being moved to enterprise only.  We&apos;d all feel better if, instead of making up bogus excuses, you just came out and said &quot;because we think it&apos;ll make you pay&quot;. &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;We heard the nonsensical reasons for $lookup via the blog... what&apos;s the reason for in-memory to be enterprise only?&lt;/p&gt;</comment>
                            <comment id="1033886" author="ron.avnur@10gen.com" created="Fri, 18 Sep 2015 01:58:23 +0000"  >&lt;p&gt;Tim,&lt;/p&gt;

&lt;p&gt;It will remain in enterprise builds for the foreseeable future and we will definitely provide an update if/when this changes.&lt;/p&gt;

&lt;p&gt;Ron&lt;/p&gt;</comment>
                            <comment id="1032854" author="timn" created="Thu, 17 Sep 2015 12:00:40 +0000"  >&lt;p&gt;Will this eventually be added to the open source version?&lt;/p&gt;</comment>
                            <comment id="1032622" author="ron.avnur@10gen.com" created="Thu, 17 Sep 2015 03:20:39 +0000"  >&lt;p&gt;Ben,&lt;/p&gt;

&lt;p&gt;We are continuing to work on an in-memory storage engine and plan to release it in the MongoDB Enterprise Server, which is why you haven&apos;t seen any public commits.&lt;/p&gt;

&lt;p&gt;The in-memory storage engine is not yet available for beta testing. When it is, you&apos;ll be able to find MongoDB Enterprise Server development builds at &lt;a href=&quot;https://www.mongodb.com/customer-evaluation-downloads-development-versions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/customer-evaluation-downloads-development-versions&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Ron&lt;/p&gt;</comment>
                            <comment id="1031336" author="chengas123" created="Wed, 16 Sep 2015 05:35:46 +0000"  >&lt;p&gt;It seems like the in-memory storage engine already is in 3.0? See &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-5011&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/DOCS-5011&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1031220" author="chengas123" created="Wed, 16 Sep 2015 01:45:17 +0000"  >&lt;p&gt;Seems like a lot of work was done on this last year. Any chance it&apos;ll make it into 3.2 in even an experimental state? It&apos;d be really helpful for setting up test environments.&lt;/p&gt;</comment>
                            <comment id="792263" author="pulsar" created="Mon, 22 Dec 2014 18:47:29 +0000"  >&lt;p&gt;i &apos;m actually facing a big difficulty to find an alternative solution to that , create in memory temp result and use it straight away with another query&lt;br/&gt;
could be very usefull , simulate a kind of join and solve many pb...&lt;br/&gt;
example in  my case :&lt;br/&gt;
i have a query A who never result change , this query could be easely cached and so on but more,&lt;br/&gt;
next i could search from query A with an IN statement..&lt;br/&gt;
there are ton of cases where this feature is helpfull;&lt;/p&gt;</comment>
                            <comment id="749750" author="xgen-internal-githook" created="Mon, 27 Oct 2014 20:48:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt; Create heap1_engine_test unittest&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5298705477bf30ebb1cc2b95732651750f6f27f0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5298705477bf30ebb1cc2b95732651750f6f27f0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="749413" author="xgen-internal-githook" created="Mon, 27 Oct 2014 17:07:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt; Heap1 is now using KVEngine&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6d7f968a9495b504bea981e392f5ec60a947123e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6d7f968a9495b504bea981e392f5ec60a947123e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="749411" author="xgen-internal-githook" created="Mon, 27 Oct 2014 17:07:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt; Improve RecordStoreHeap&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Now supports rollback&lt;/li&gt;
	&lt;li&gt;No more reinterpret_cast&amp;lt;&amp;gt;&lt;/li&gt;
	&lt;li&gt;Fixed an iterator invalidation bug in the reverse iterator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/72abd814bb6e2b8d51774b6e19d9ae47255471c8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/72abd814bb6e2b8d51774b6e19d9ae47255471c8&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="749410" author="xgen-internal-githook" created="Mon, 27 Oct 2014 17:07:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt; Clean up Heap1RecoveryUnit and implement recordChange()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1ccde1e095c8b18280417fd2ef638db7e956423a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1ccde1e095c8b18280417fd2ef638db7e956423a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="720803" author="eliot" created="Wed, 17 Sep 2014 14:56:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1152&quot; title=&quot;mongoimport not creating object for valid JSON file input&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1152&quot;&gt;&lt;del&gt;SERVER-1152&lt;/del&gt;&lt;/a&gt;: make SortedDataInterface work for heap1&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cce6a04bcb073699a9e16a6ce9eca587060f8c3f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cce6a04bcb073699a9e16a6ce9eca587060f8c3f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="681835" author="xgen-internal-githook" created="Tue, 5 Aug 2014 16:48:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: hack index linking to make unit testing heap possible&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6499f50b1fb6333096b8c358deededb920738f7e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6499f50b1fb6333096b8c358deededb920738f7e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="681598" author="xgen-internal-githook" created="Tue, 5 Aug 2014 12:59:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: clean max handling in heap1 capped collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5d311d9f0583e3d74ce1aa47c66965cd0b39276f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5d311d9f0583e3d74ce1aa47c66965cd0b39276f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="679185" author="xgen-internal-githook" created="Fri, 1 Aug 2014 20:56:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13635&quot; title=&quot;Clean up the storage abstraction layer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13635&quot;&gt;&lt;del&gt;SERVER-13635&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: fix collmod test to be genric and support in heap1&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a3e39c37f750fe3b933a970a470a96780b71e54b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a3e39c37f750fe3b933a970a470a96780b71e54b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="678726" author="xgen-internal-githook" created="Fri, 1 Aug 2014 14:41:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: fix heap1 handling of large keys&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c869fa7ca774be7178d540ba023dad42be2a169a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c869fa7ca774be7178d540ba023dad42be2a169a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="678720" author="xgen-internal-githook" created="Fri, 1 Aug 2014 14:41:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: implement base of HeapRecordStore::setCustomOption&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d7a94e259c94a46feab8fabebbd8c4dc0eebce8f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d7a94e259c94a46feab8fabebbd8c4dc0eebce8f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="678719" author="xgen-internal-githook" created="Fri, 1 Aug 2014 14:41:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: fix reverseIterator for heap record store&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/93625eb6a773f0ecdd0324afba4926f35c9abe43&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/93625eb6a773f0ecdd0324afba4926f35c9abe43&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="675933" author="xgen-internal-githook" created="Wed, 30 Jul 2014 03:46:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: fix bug in save/restore cursor handling for heap1&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7b3a7003634778690cf3114d30b16b0f49a01711&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7b3a7003634778690cf3114d30b16b0f49a01711&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="629203" author="xgen-internal-githook" created="Fri, 20 Jun 2014 17:07:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: head record store update now works&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/152dd4f70ec3c627b7ceec6ff52855ab6c3cb341&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/152dd4f70ec3c627b7ceec6ff52855ab6c3cb341&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="627500" author="xgen-internal-githook" created="Thu, 19 Jun 2014 14:44:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: turn off unit test until can clean library dependencies&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/77472f85d6cadf99cece2019063dd35067ff682f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/77472f85d6cadf99cece2019063dd35067ff682f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="627414" author="xgen-internal-githook" created="Thu, 19 Jun 2014 13:24:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: insert and find works&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5eae3ef25468bba0a85640ddd578326c7381d596&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5eae3ef25468bba0a85640ddd578326c7381d596&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="627127" author="xgen-internal-githook" created="Thu, 19 Jun 2014 06:01:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13635&quot; title=&quot;Clean up the storage abstraction layer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13635&quot;&gt;&lt;del&gt;SERVER-13635&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: can choose heap1 at startup, but doesn&apos;t remotely work yet&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b4cafb46595d6e889f8effdca16e98c3f505078e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b4cafb46595d6e889f8effdca16e98c3f505078e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="626541" author="xgen-internal-githook" created="Wed, 18 Jun 2014 19:40:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1153&quot; title=&quot;Create an in-memory only storage engine&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1153&quot;&gt;&lt;del&gt;SERVER-1153&lt;/del&gt;&lt;/a&gt;: some very simple db ops work&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/07a28c5089142100c15ca403eabdfc535e03a229&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/07a28c5089142100c15ca403eabdfc535e03a229&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="385710" author="marce" created="Sun, 21 Jul 2013 10:58:20 +0000"  >&lt;p&gt;I prefer MongoDB over RavenDB (in many ways) but I&apos;m currently forced to use RavenDB for apps in a shared environment because it has an embedded mode, so please relieve me &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="326368" author="maimonoded" created="Thu, 2 May 2013 07:27:37 +0000"  >&lt;p&gt;I&apos;ve done this in the past, it does work as it should but it complicates the mongodb maintenance, it will be cleaner to have mongodb know about it and handle it by itself.&lt;/p&gt;

&lt;p&gt;BTW, this same solution can be done by DB level if you use --directoryperdb and only use tmpfs on the specific db directory.&lt;/p&gt;</comment>
                            <comment id="326079" author="antoine" created="Wed, 1 May 2013 21:31:22 +0000"  >&lt;p&gt;This should be working fine as-is, see a write up on it:&lt;br/&gt;
&lt;a href=&quot;http://edgystuff.tumblr.com/post/49304254688/how-to-use-mongodb-as-a-pure-in-memory-db-redis-style&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://edgystuff.tumblr.com/post/49304254688/how-to-use-mongodb-as-a-pure-in-memory-db-redis-style&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="172531" author="philidem" created="Mon, 8 Oct 2012 14:48:59 +0000"  >&lt;p&gt;I see that a few people have proposed using in-memory databases for the purpose of caching and testing. I would also like to suggest this feature for the purpose of &lt;em&gt;temporary collections&lt;/em&gt;. For example, the output of a Map-Reduce job could be directed to a temporary collection. Since the collection is derived from other data there is no need to persist it to disk. The temporary collection could then be used by the application. Performance should be improved by avoiding unnecessary disk I/O.&lt;/p&gt;</comment>
                            <comment id="137437" author="ractive" created="Thu, 28 Jun 2012 08:18:01 +0000"  >&lt;p&gt;I&apos;d like to see an in-memory solution to simplify integration testing with MongoDB.&lt;/p&gt;</comment>
                            <comment id="135381" author="slyons" created="Thu, 21 Jun 2012 16:56:16 +0000"  >&lt;p&gt;I&apos;m going to chime in that it would be great to have this feature. Even a capped collection that was only in memory would help a lot.&lt;/p&gt;</comment>
                            <comment id="85296" author="evgenym" created="Sat, 4 Feb 2012 16:49:36 +0000"  >&lt;p&gt;In SQLite if you specify database name as &lt;b&gt;:memory:&lt;/b&gt; then in-memory database is used. I love this feature of SQLite, it makes testing really fast. I really miss this feature in mongo, hope something similar will be possible some day.&lt;/p&gt;</comment>
                            <comment id="83476" author="rak" created="Mon, 30 Jan 2012 21:34:54 +0000"  >&lt;p&gt;can this be prioritised please?&lt;/p&gt;</comment>
                            <comment id="75636" author="alexbarnes" created="Fri, 23 Dec 2011 11:45:22 +0000"  >&lt;p&gt;Being able to fire up an in-memory mongo instance to run tests against would be very useful.&lt;/p&gt;</comment>
                            <comment id="29352" author="remonvv" created="Wed, 20 Apr 2011 07:52:30 +0000"  >&lt;p&gt;@auto : No, you can&apos;t just do dropDatabase because that&apos;d still require an on-disk database which is what you want to avoid on unit test machines that may run many thousands of tests&lt;/p&gt;

&lt;p&gt;@Dominique : Not sure of LRU collections are part of this issue, but it&apos;d be a great feature to have once MongoDB allows various ways to use hashing for shard addressing (rather than the current chunk size based balancing to distribute data)&lt;/p&gt;</comment>
                            <comment id="29275" author="dmdevito" created="Tue, 19 Apr 2011 13:43:13 +0000"  >&lt;p&gt;It would be useful to enable to define in-memory-only LRU collections (not only capped collections, but truly LRU collections).&lt;/p&gt;

&lt;p&gt;Then, Mongo could be used in place of memcache.&lt;br/&gt;
Users may be then able to use Mongo into different tiers (as a cache, into the middle tiers, and/or as back-end storage into the last tiers).&lt;/p&gt;</comment>
                            <comment id="19756" author="auto" created="Thu, 28 Oct 2010 13:29:31 +0000"  >&lt;p&gt;Why can&apos;t you just do a dropDatabase before and after?&lt;/p&gt;



</comment>
                            <comment id="19755" author="remonvv" created="Thu, 28 Oct 2010 13:22:48 +0000"  >&lt;p&gt;We need this too. The in memory file system option is rarely actually an option. Other than performance gains (which is not that relevant to me) a more important issue is testability. Most automated testing requires a short lived mongod process that does not perform any sort of disk IO. This way we can create isolated integration tests without having to setup a mini version of production deploy environments.&lt;/p&gt;

&lt;p&gt;For example, on RDBMS systems our (and many other companies&apos;) tests look like this&lt;/p&gt;

&lt;p&gt;1) Start in memory DB&lt;br/&gt;
2) Import database start state (e.g. .sql import)&lt;br/&gt;
3) Run tested component code&lt;br/&gt;
4) Validate results&lt;br/&gt;
5) Pass/fail the test in build system reporting&lt;/p&gt;

&lt;p&gt;Mongo is currently blocking us on 1) which makes it a less than ideal choice for environments with this sort of testing.&lt;/p&gt;</comment>
                            <comment id="14894" author="vdrac" created="Mon, 21 Jun 2010 05:53:34 +0000"  >&lt;p&gt;Sure, it is a possibility, but is it as efficient as a native solution ? &lt;br/&gt;
I am not sure that MongoDB could cover my needs, even in this situation, but from the conceptual point of view, it seems to be the best way to do.&lt;br/&gt;
In terms of performances, I need to be able to update about 10000 parameters (let&apos;s say integers) within 50ms on something like 10 processing units (standard PC based on Core2Duo in the best case and Atom in the worst) using an Ethernet Gigabyte network (in a lab, means short distances &amp;lt;5m of cable length, full duplex etc, so the network performances are not a problem, I think).&lt;br/&gt;
Any way if I can find voters... &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/wink.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;br/&gt;
And thanks for all the comments.&lt;/p&gt;</comment>
                            <comment id="14862" author="phpmoadmin" created="Fri, 18 Jun 2010 10:52:34 +0000"  >&lt;p&gt;Hi Richard, your suggestion is exactly what I have posted at &lt;a href=&quot;http://www.phpmoadmin.com/mongodb-in-memory-database&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.phpmoadmin.com/mongodb-in-memory-database&lt;/a&gt; - it works but there are limitations with this method.&lt;/p&gt;</comment>
                            <comment id="14860" author="richard@10gen.com" created="Fri, 18 Jun 2010 10:22:52 +0000"  >&lt;p&gt;Some operating systems offer in-memory file system formats (e.g., Linux&apos;s tmpfs); you could probably have a mongod use an in-memory file system for the dbpath...&lt;/p&gt;</comment>
                            <comment id="14858" author="eliot" created="Fri, 18 Jun 2010 08:09:35 +0000"  >&lt;p&gt;Its not that hard, so will probably happen, just a prioritization issue.&lt;br/&gt;
The more votes you can drum up for the case the better &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                    </comments>
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