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    <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>
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<item>
            <title>[SERVER-1143] Allow --notablescan to be specified per connection</title>
                <link>https://jira.mongodb.org/browse/SERVER-1143</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Being able to disallow table scans on a per-connection basis would be useful for testing. An applications test suite could disallow table scans so that any test that attempted a full table scan would fail.&lt;/p&gt;

&lt;p&gt;Finer grained per-query --notablescan would be more useful, but the above would sufficiently cover the most common use case of testing code.&lt;/p&gt;</description>
                <environment></environment>
        <key id="12008">SERVER-1143</key>
            <summary>Allow --notablescan to be specified per connection</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="schmichael">Michael Schurter</reporter>
                        <labels>
                            <label>asya</label>
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                <created>Mon, 24 May 2010 12:21:37 +0000</created>
                <updated>Fri, 7 Apr 2023 15:45:45 +0000</updated>
                                                                            <component>Querying</component>
                                        <votes>14</votes>
                                    <watches>20</watches>
                                                                                                                <comments>
                            <comment id="1379238" author="mark1" created="Thu, 8 Sep 2016 07:27:39 +0000"  >&lt;p&gt;I agree with Glen... I am using it on test machine by default but have occasional issues:&lt;/p&gt;

&lt;p&gt;1. I think there&apos;s a serious bug because it seems &apos;notablescan&apos; also applies to tailable collections/queries,&lt;br/&gt;
when using the (&quot;_id&quot; &amp;gt; lastId, $natural order) condition to resume the cursor.&lt;/p&gt;

&lt;p&gt;2. It would be very useful to be able to turn it off for each connection/statement, just in case &lt;br/&gt;
(mostly for ad-hoc queries from interactive clients). Possibly also as workaround for 1 above.&lt;/p&gt;

&lt;p&gt;3. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15561&quot; title=&quot;I want to apply notablescan to per DB or per COLLECTION on production.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15561&quot;&gt;SERVER-15561&lt;/a&gt; (per db/collection) would also be nice (especially to disable the default) although fixing 1 or adding 2 would be just fine.&lt;/p&gt;</comment>
                            <comment id="937873" author="glen.miner" created="Thu, 11 Jun 2015 16:54:34 +0000"  >&lt;p&gt;My preference would be the reverse &amp;#8211; notablescan on by default and you can take the safety off like rs.slaveOk() for the connection when you really want to play with fire. We&apos;ve been bitten by COLSCAN quries way, way too many times.&lt;/p&gt;</comment>
                            <comment id="736229" author="crumbjp" created="Wed, 8 Oct 2014 06:01:59 +0000"  >&lt;p&gt;Totally agree with you Nils..&lt;/p&gt;</comment>
                            <comment id="195203" author="nilskp" created="Tue, 20 Nov 2012 22:46:53 +0000"  >&lt;p&gt;This really would be a nice feature to have. Specifying --notablescan on the server is often a non-starter as it would make it almost impossible to perform ad-hoc queries. And so this very useful functionality remains mostly unusable.&lt;/p&gt;</comment>
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