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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-15277] dbhash caching strategy evaluation</title>
                <link>https://jira.mongodb.org/browse/SERVER-15277</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;My understanding is that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-11021&quot; title=&quot;cache dbhash results in mongod for config. collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-11021&quot;&gt;&lt;del&gt;SERVER-11021&lt;/del&gt;&lt;/a&gt; caches dbHash results for config collections, and this helps performance of config servers. There&apos;s though nothing that prevents a user to create a db called config and use that as an ordinary database (rather than a config database) and on which subsequent calls of dbhash will return the cached value.&lt;br/&gt;
Can&apos;t all the dbs cache dbhash results or, if the current behaviour is preserved, can some form of validation be introduced so that only config databases on config servers cache results for dbhash?&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="158549">SERVER-15277</key>
            <summary>dbhash caching strategy evaluation</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                            <label>28qa</label>
                            <label>lamont-triage</label>
                    </labels>
                <created>Tue, 16 Sep 2014 23:40:53 +0000</created>
                <updated>Tue, 6 Dec 2022 05:01:23 +0000</updated>
                            <resolved>Fri, 5 Nov 2021 15:26:00 +0000</resolved>
                                    <version>2.7.6</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="723006" author="greg_10gen" created="Fri, 19 Sep 2014 14:41:33 +0000"  >&lt;p&gt;This is an issue, though it&apos;s definitely not good practice to use &quot;config&quot; as a database name, even on a single node - this prevents sharding in the future.&lt;/p&gt;

&lt;p&gt;The main challenge is that config servers are passive storage - they aren&apos;t necessarily aware that they are special.  Think the solution is to turn off this caching behavior unless explicitly enabled by a field mongos can pass to the dbhash command.&lt;/p&gt;</comment>
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            <issuekey id="246808">SERVER-22156</issuekey>
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