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	<title>unused &#8211; dbtan 谈DB</title>
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	<item>
		<title>标记列为未使用 (Marking Columns Unused)</title>
		<link>https://dbtan.com/2016/12/marking-columns-unused.html</link>
					<comments>https://dbtan.com/2016/12/marking-columns-unused.html#respond</comments>
		
		<dc:creator><![CDATA[dbtan]]></dc:creator>
		<pubDate>Fri, 16 Dec 2016 07:56:25 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oracle数据库管理]]></category>
		<category><![CDATA[Making Columns Unused]]></category>
		<category><![CDATA[unused]]></category>
		<guid isPermaLink="false">http://www.dbtan.com/?p=310</guid>

					<description><![CDATA[Marking Columns Unused 基本操作步骤 1. 标记列为未使用 ALTER TABLE &#038;l [&#8230;]]]></description>
										<content:encoded><![CDATA[<p>Marking Columns Unused 基本操作步骤</p>
<p>1. 标记列为未使用</p>
<p>ALTER TABLE &lt;table_name&gt; SET UNUSED (&lt;column_name&gt;);</p>
<p>2. 然后在数据库空闲时，再删除列</p>
<p>ALTER TABLE &lt;table[......]</p>
<p class="read-more"><a href="https://dbtan.com/2016/12/marking-columns-unused.html">阅读全文</a></p>
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