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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-23321] Allow pinning specific WT collections in memory</title>
                <link>https://jira.mongodb.org/browse/SERVER-23321</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are use cases that would benefit from the ability to keep an infrequently used collection in cache to reduce latency of queries to that collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="274662">SERVER-23321</key>
            <summary>Allow pinning specific WT collections in memory</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Mar 2016 20:16:14 +0000</created>
                <updated>Tue, 6 Dec 2022 04:29:57 +0000</updated>
                            <resolved>Mon, 11 May 2020 19:30:01 +0000</resolved>
                                                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>5</votes>
                                    <watches>25</watches>
                                                                                                                <comments>
                            <comment id="3079389" author="milkie" created="Mon, 11 May 2020 19:30:01 +0000"  >&lt;p&gt;Rather than adding the proposed knob, the recommended way of reducing paging is to adjust workloads or add cache memory.  Certainly if a collection is read frequently, the eviction algorithm is already deprioritizing such pages when considering them for eviction.  If the pages are still being evicted, the system must need that cache memory for other immediate purposes and preventing this eviction will lead to other problems.&lt;/p&gt;

&lt;p&gt;Pinning certain tables into memory such that the pages cannot be evicted can introduce new cache-full and eviction failure scenarios, so I am closing this as Won&apos;t-Do.  &lt;/p&gt;</comment>
                            <comment id="1987919" author="gangur" created="Tue, 28 Aug 2018 18:29:13 +0000"  >&lt;p&gt;We have a collection that goes through heavy read operation quite frequently. Due to other collections in the Mongo cluster being too large, the pages are getting evicted and read operations are reaching disk. This is a typical identities types collection which are accessed quite often by various modules in our product.&#160;&lt;/p&gt;</comment>
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