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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>
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<item>
            <title>[DOCS-1245] Misleading comment saying point-in-time snapshop is impossible with mongodump</title>
                <link>https://jira.mongodb.org/browse/DOCS-1245</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;blockquote&gt;
&lt;p&gt;binary database dumps are comparatively small, because they don&#8217;t include index content or pre-allocated free space, and record padding. However, it&#8217;s impossible to capture a copy of a running system that reflects a single moment in time using a binary dump.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Point-in-time snapshots are possible using &lt;tt&gt;mongodump --oplog&lt;/tt&gt; (since 1.7.4) if the instance is running as part of a replica set.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Both methodologies have advantages and disadvantages&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Even if my assertion above is shown to be incorrect, only a single disadvantage is listed for each strategy.&lt;/p&gt;</description>
                <environment>&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://docs.mongodb.org/manual/administration/backups/&quot;&gt;http://docs.mongodb.org/manual/administration/backups/&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.172 Safari/537.22&lt;br/&gt;
*Referrer*: &lt;a href=&quot;http://docs.mongodb.org/manual/contents/&quot;&gt;http://docs.mongodb.org/manual/contents/&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1920 x 1080&lt;br/&gt;
*repo*: docs&lt;br/&gt;
*source*: administration/backups&lt;br/&gt;
</environment>
        <key id="68654">DOCS-1245</key>
            <summary>Misleading comment saying point-in-time snapshop is impossible with mongodump</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="-1">Unassigned</assignee>
                                    <reporter username="michaeltwofish">Michael C. Harris</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                    </labels>
                <created>Sat, 16 Mar 2013 06:08:02 +0000</created>
                <updated>Fri, 3 Nov 2017 11:23:38 +0000</updated>
                            <resolved>Thu, 16 Jan 2014 19:16:01 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="483247" author="kay.kim@10gen.com" created="Thu, 16 Jan 2014 19:16:01 +0000"  >&lt;p&gt;Closing as the backup strategy page underwent significant rewrite&lt;/p&gt;</comment>
                            <comment id="291474" author="michaeltwofish" created="Sun, 17 Mar 2013 21:00:55 +0000"  >&lt;p&gt;Thanks, I&apos;ll expand to include &lt;tt&gt;--oplogReplay&lt;/tt&gt; and mention time.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;it definitely doesn&apos;t work in the sharded case.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Do you mean because of the difficulty of synchronising backups across nodes? If so, that&apos;s an issue that&apos;s not restricted to binary dumps. I&apos;ll move point-in-time snapshots to another paragraph, it&apos;s becoming clunky in the list.&lt;/p&gt;</comment>
                            <comment id="291355" author="samk" created="Sun, 17 Mar 2013 15:29:29 +0000"  >&lt;p&gt;&lt;tt&gt;-&lt;del&gt;oplog&lt;/tt&gt; helps (when used with {{&lt;/del&gt;-oplogReplay)), but the problem is less in the single-member or single replica-set case, it definitely doesn&apos;t work in the sharded case.&lt;/p&gt;

&lt;p&gt;I&apos;ll get someone else with more backup experience than I have to look this over, but I think it would be good to: &lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;add notes about &lt;tt&gt;--oplogReplay&lt;/tt&gt;, and&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;mention that mongodump/mongorestores take longer to complete (in general.)&lt;/li&gt;
&lt;/ul&gt;
</comment>
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