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	<title>Comments on: 11g新特性: OLTP中的Adaptive Direct Read算法</title>
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	<description>专注于现实世界Oracle数据库的高性能，高可扩展性与新一代数据库Exadata架构</description>
	<lastBuildDate>Fri, 23 Jul 2010 09:51:45 -0700</lastBuildDate>
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		<title>By: Articles about _small_table_threshold volume 5 &#171; Article Directory</title>
		<link>http://www.os2ora.com/11g-new-feature-adaptive-direct-read/comment-page-1/#comment-592</link>
		<dc:creator>Articles about _small_table_threshold volume 5 &#171; Article Directory</dc:creator>
		<pubDate>Mon, 14 Jun 2010 19:41:38 +0000</pubDate>
		<guid isPermaLink="false">http://www.os2ora.com/11g-new-feature-adaptive-direct-read/#comment-592</guid>
		<description>[...] OS与Oracle &#8221; 11g新特性: OLTP中的Adaptive Direct Read算法 它取决于多个统计信息,例如当前buffer cache的大小,_small_table_threshold的大小,当前dirty blocks还占的比例等等。 因此,即使在11g中_serial_direct_read的值为false,serial direct read也可能起作用。 &#8230; [...]</description>
		<content:encoded><![CDATA[<p>[...] OS与Oracle &#8221; 11g新特性: OLTP中的Adaptive Direct Read算法 它取决于多个统计信息,例如当前buffer cache的大小,_small_table_threshold的大小,当前dirty blocks还占的比例等等。 因此,即使在11g中_serial_direct_read的值为false,serial direct read也可能起作用。 &#8230; [...]</p>
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		<title>By: Oracle 11g Adaptive direct path read的几篇链接. &#187; a db thinker&#39;s home</title>
		<link>http://www.os2ora.com/11g-new-feature-adaptive-direct-read/comment-page-1/#comment-154</link>
		<dc:creator>Oracle 11g Adaptive direct path read的几篇链接. &#187; a db thinker&#39;s home</dc:creator>
		<pubDate>Tue, 22 Dec 2009 01:45:55 +0000</pubDate>
		<guid isPermaLink="false">http://www.os2ora.com/11g-new-feature-adaptive-direct-read/#comment-154</guid>
		<description>[...] http://www.os2ora.com/11g-new-feature-adaptive-direct-read/ 11g新特性: OLTP中的Adaptive Direct Read算法 国内Oracle Real Performance Team的一个工程师写的关于此的介绍, 细节上不如上一个. [...]</description>
		<content:encoded><![CDATA[<p>[...] <a href="http://www.os2ora.com/11g-new-feature-adaptive-direct-read/" rel="nofollow">http://www.os2ora.com/11g-new-feature-adaptive-direct-read/</a> 11g新特性: OLTP中的Adaptive Direct Read算法 国内Oracle Real Performance Team的一个工程师写的关于此的介绍, 细节上不如上一个. [...]</p>
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		<title>By: Kaya</title>
		<link>http://www.os2ora.com/11g-new-feature-adaptive-direct-read/comment-page-1/#comment-117</link>
		<dc:creator>Kaya</dc:creator>
		<pubDate>Fri, 30 Oct 2009 09:48:04 +0000</pubDate>
		<guid isPermaLink="false">http://www.os2ora.com/11g-new-feature-adaptive-direct-read/#comment-117</guid>
		<description>DW一般都采用并行查询，所以基本上采用的是direct path read。一个checkpoint操作的代价对于一个大查询来说代价其实微乎其微。</description>
		<content:encoded><![CDATA[<p>DW一般都采用并行查询，所以基本上采用的是direct path read。一个checkpoint操作的代价对于一个大查询来说代价其实微乎其微。</p>
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		<title>By: Wu, Qihua</title>
		<link>http://www.os2ora.com/11g-new-feature-adaptive-direct-read/comment-page-1/#comment-115</link>
		<dc:creator>Wu, Qihua</dc:creator>
		<pubDate>Fri, 30 Oct 2009 09:29:32 +0000</pubDate>
		<guid isPermaLink="false">http://www.os2ora.com/11g-new-feature-adaptive-direct-read/#comment-115</guid>
		<description>exadata 用于DW, 基本上用direct path read么？ 如果是， 每次direct path read都会触发 checkpoint,如果有大量的update, 同时有多个并发query, checkpoin 会成为瓶颈么？</description>
		<content:encoded><![CDATA[<p>exadata 用于DW, 基本上用direct path read么？ 如果是， 每次direct path read都会触发 checkpoint,如果有大量的update, 同时有多个并发query, checkpoin 会成为瓶颈么？</p>
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