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            <title>[SERVER-7193] Question about mongodump output - question asked in training today</title>
                <link>https://jira.mongodb.org/browse/SERVER-7193</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi there,&lt;/p&gt;

&lt;p&gt;I have a question about mongodump output. I had a student in my class show me the following output:&lt;/p&gt;


&lt;p&gt;kevinhanson@ubuntu:~$ labcorp/mongodb-linux-x86_64-2.2.0/bin/mongodump --oplog&lt;br/&gt;
connected to: 127.0.0.1&lt;br/&gt;
Thu Sep 27 21:37:31 all dbs&lt;br/&gt;
Thu Sep 27 21:37:31 DATABASE: test	 to 	dump/test&lt;br/&gt;
Thu Sep 27 21:37:31 	test.test to dump/test/test.bson&lt;br/&gt;
Thu Sep 27 21:37:31 doing snapshot query&lt;br/&gt;
Thu Sep 27 21:37:31 		 2 objects&lt;br/&gt;
Thu Sep 27 21:37:31 	Metadata for test.test to dump/test/test.metadata.json&lt;br/&gt;
Thu Sep 27 21:37:31 	test.stuff to dump/test/stuff.bson&lt;br/&gt;
Thu Sep 27 21:37:31 doing snapshot query&lt;br/&gt;
Thu Sep 27 21:37:31 		 3 objects&lt;br/&gt;
Thu Sep 27 21:37:31 	Metadata for test.stuff to dump/test/stuff.metadata.json&lt;br/&gt;
Thu Sep 27 21:37:31 	local.oplog.rs to dump/oplog.bson&lt;br/&gt;
Thu Sep 27 21:37:31 		 0 objects&lt;/p&gt;

&lt;p&gt;His question was, &quot;Why are there zero objects for the oplog?&quot; I&apos;m confused as well. I see that an oplog.bson file got dumped into the dump directory. What do the number of objects refer to, in general? Thanks! I&apos;d like to report back by the start of training in the morning. I don&apos;t see any reference to the objects on the manual here: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/mongodump/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/mongodump/&lt;/a&gt; Perhaps we should update that documentation.&lt;/p&gt;</description>
                <environment></environment>
        <key id="51725">SERVER-7193</key>
            <summary>Question about mongodump output - question asked in training today</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="kevinhanson">Kevin Hanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 28 Sep 2012 04:40:06 +0000</created>
                <updated>Fri, 15 Feb 2013 15:06:40 +0000</updated>
                            <resolved>Fri, 28 Sep 2012 10:57:09 +0000</resolved>
                                                                    <component>Tools</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="169136" author="scotthernandez" created="Fri, 28 Sep 2012 10:55:09 +0000"  >&lt;p&gt;If no writes come in during the dump it will be empty. The oplog here only records changes from the start of the dump to the end to give a point in a time backup.&lt;/p&gt;</comment>
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