<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
	>

<channel>
	<title>Oralce performance &#8211; 妮妮爸爸的技术博客</title>
	<atom:link href="http://www.minniebaby.tech/category/oracle/oralce-performance/feed/" rel="self" type="application/rss+xml" />
	<link>http://www.minniebaby.tech</link>
	<description>Phone:18685078367 提供专业Oracle/MySQL/PostgreSQL数据恢复、性能优化、迁移升级、紧急救援等服务</description>
	<lastBuildDate>Tue, 10 Feb 2026 10:10:59 +0000</lastBuildDate>
	<language>zh-CN</language>
	<sy:updatePeriod>
	hourly	</sy:updatePeriod>
	<sy:updateFrequency>
	1	</sy:updateFrequency>
	<generator>https://wordpress.org/?v=6.2.10</generator>
	<item>
		<title>semi/anti join cache</title>
		<link>http://www.minniebaby.tech/2026/02/10/semi-anti-join-cache/</link>
					<comments>http://www.minniebaby.tech/2026/02/10/semi-anti-join-cache/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Tue, 10 Feb 2026 09:33:55 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[_query_execution_cache_max_size]]></category>
		<category><![CDATA[anti]]></category>
		<category><![CDATA[semi]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3567</guid>

					<description><![CDATA[之前写过一篇标量子查询缓存http://www.minniebaby.tech/ &#8230; <a href="http://www.minniebaby.tech/2026/02/10/semi-anti-join-cache/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2026/02/10/semi-anti-join-cache/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>oracle优化器缺陷(三)</title>
		<link>http://www.minniebaby.tech/2025/09/08/oracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%bc%ba%e9%99%b7%e4%b8%89/</link>
					<comments>http://www.minniebaby.tech/2025/09/08/oracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%bc%ba%e9%99%b7%e4%b8%89/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Mon, 08 Sep 2025 08:02:45 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[_optimizer_outer_join_to_inner]]></category>
		<category><![CDATA[OUTER_JOIN_TO_INNER]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3524</guid>

					<description><![CDATA[本篇文章的主要详细展开的是优化器外连接转内连接的内容，外连接转连接其实是很多数据 &#8230; <a href="http://www.minniebaby.tech/2025/09/08/oracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%bc%ba%e9%99%b7%e4%b8%89/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2025/09/08/oracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%bc%ba%e9%99%b7%e4%b8%89/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>oracle compression table internals</title>
		<link>http://www.minniebaby.tech/2025/06/12/oracle-compression-table-internals/</link>
					<comments>http://www.minniebaby.tech/2025/06/12/oracle-compression-table-internals/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Thu, 12 Jun 2025 13:38:11 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oracle troubleshooting]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[compression]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3522</guid>

					<description><![CDATA[压缩表介绍 Oracle可在表空间、表、分区级进行压缩，如果表空间设置了压缩方式 &#8230; <a href="http://www.minniebaby.tech/2025/06/12/oracle-compression-table-internals/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2025/06/12/oracle-compression-table-internals/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>oracle partial join eval</title>
		<link>http://www.minniebaby.tech/2025/04/21/oracle-partial-join-eval/</link>
					<comments>http://www.minniebaby.tech/2025/04/21/oracle-partial-join-eval/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Mon, 21 Apr 2025 06:14:57 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[CBO]]></category>
		<category><![CDATA[partial join eval]]></category>
		<category><![CDATA[PJE]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3520</guid>

					<description><![CDATA[在oracle sql优化中，往往只关注逻辑读的消耗，而忽略了join消耗的时间 &#8230; <a href="http://www.minniebaby.tech/2025/04/21/oracle-partial-join-eval/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2025/04/21/oracle-partial-join-eval/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>不要再用varchar2存储date/timestamp了！！！</title>
		<link>http://www.minniebaby.tech/2025/01/03/%e4%b8%8d%e8%a6%81%e5%86%8d%e7%94%a8varchar2%e5%ad%98%e5%82%a8date-timestamp%e4%ba%86%ef%bc%81%ef%bc%81%ef%bc%81/</link>
					<comments>http://www.minniebaby.tech/2025/01/03/%e4%b8%8d%e8%a6%81%e5%86%8d%e7%94%a8varchar2%e5%ad%98%e5%82%a8date-timestamp%e4%ba%86%ef%bc%81%ef%bc%81%ef%bc%81/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Fri, 03 Jan 2025 13:37:01 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[varchar2]]></category>
		<category><![CDATA[直方图]]></category>
		<category><![CDATA[统计信息]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3515</guid>

					<description><![CDATA[新年来临之际，血的教训让大家都知道了新年来临之前要去检查分区表的新年分区是否创建 &#8230; <a href="http://www.minniebaby.tech/2025/01/03/%e4%b8%8d%e8%a6%81%e5%86%8d%e7%94%a8varchar2%e5%ad%98%e5%82%a8date-timestamp%e4%ba%86%ef%bc%81%ef%bc%81%ef%bc%81/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2025/01/03/%e4%b8%8d%e8%a6%81%e5%86%8d%e7%94%a8varchar2%e5%ad%98%e5%82%a8date-timestamp%e4%ba%86%ef%bc%81%ef%bc%81%ef%bc%81/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>oracle scalar subquery caching</title>
		<link>http://www.minniebaby.tech/2024/12/21/oracle-scalar-subquery-caching/</link>
					<comments>http://www.minniebaby.tech/2024/12/21/oracle-scalar-subquery-caching/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Sat, 21 Dec 2024 04:59:55 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[scalar subquery caching]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3513</guid>

					<description><![CDATA[这是oracle特有的特性，当对于子查询未展开(包括标量子查询)时，oracle &#8230; <a href="http://www.minniebaby.tech/2024/12/21/oracle-scalar-subquery-caching/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2024/12/21/oracle-scalar-subquery-caching/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>oracle优化器缺陷(二)</title>
		<link>http://www.minniebaby.tech/2024/11/24/oracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%bc%ba%e9%99%b7%e4%ba%8c/</link>
					<comments>http://www.minniebaby.tech/2024/11/24/oracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%bc%ba%e9%99%b7%e4%ba%8c/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Sun, 24 Nov 2024 15:38:12 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[CVM]]></category>
		<category><![CDATA[SLP]]></category>
		<category><![CDATA[view merge]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3506</guid>

					<description><![CDATA[今天看了一下好友anbob的文章，主要内容涉及CBO的一些查询转换，主题是在开发 &#8230; <a href="http://www.minniebaby.tech/2024/11/24/oracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%bc%ba%e9%99%b7%e4%ba%8c/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2024/11/24/oracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%bc%ba%e9%99%b7%e4%ba%8c/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>oracle优化器缺陷(一)</title>
		<link>http://www.minniebaby.tech/2024/10/26/%e4%bb%8e%e4%b8%80%e6%9d%a1%e5%88%86%e9%a1%b5sql%e4%bc%98%e5%8c%96%e7%9c%8boracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%9a%84%e4%b8%8d%e8%b6%b3/</link>
					<comments>http://www.minniebaby.tech/2024/10/26/%e4%bb%8e%e4%b8%80%e6%9d%a1%e5%88%86%e9%a1%b5sql%e4%bc%98%e5%8c%96%e7%9c%8boracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%9a%84%e4%b8%8d%e8%b6%b3/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Sat, 26 Oct 2024 15:09:26 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[优化器]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3502</guid>

					<description><![CDATA[ORACLE的优化器，在众多dba眼中都是世界上最好的优化器，一直是其他数据库， &#8230; <a href="http://www.minniebaby.tech/2024/10/26/%e4%bb%8e%e4%b8%80%e6%9d%a1%e5%88%86%e9%a1%b5sql%e4%bc%98%e5%8c%96%e7%9c%8boracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%9a%84%e4%b8%8d%e8%b6%b3/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2024/10/26/%e4%bb%8e%e4%b8%80%e6%9d%a1%e5%88%86%e9%a1%b5sql%e4%bc%98%e5%8c%96%e7%9c%8boracle%e4%bc%98%e5%8c%96%e5%99%a8%e7%9a%84%e4%b8%8d%e8%b6%b3/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>Query Transformation- Distinct Aggregate Transformation</title>
		<link>http://www.minniebaby.tech/2024/06/26/query-transformation-distinct-aggregate-transformation/</link>
					<comments>http://www.minniebaby.tech/2024/06/26/query-transformation-distinct-aggregate-transformation/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Wed, 26 Jun 2024 15:09:58 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[CBO]]></category>
		<category><![CDATA[Distinct Aggregate Transformation]]></category>
		<category><![CDATA[Hash Group Aggregate]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3477</guid>

					<description><![CDATA[GROUP BY操作是数据库中非常常见的语法，通常用于聚合函数的聚合操作。对于o &#8230; <a href="http://www.minniebaby.tech/2024/06/26/query-transformation-distinct-aggregate-transformation/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2024/06/26/query-transformation-distinct-aggregate-transformation/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
		<item>
		<title>troubleshooting not JPPD cause View is a set query block</title>
		<link>http://www.minniebaby.tech/2023/11/15/troubleshooting-not-jppd-cause-view-is-a-set-query-block/</link>
					<comments>http://www.minniebaby.tech/2023/11/15/troubleshooting-not-jppd-cause-view-is-a-set-query-block/#respond</comments>
		
		<dc:creator><![CDATA[lixiangyu]]></dc:creator>
		<pubDate>Wed, 15 Nov 2023 08:14:33 +0000</pubDate>
				<category><![CDATA[Oracle]]></category>
		<category><![CDATA[Oralce performance]]></category>
		<category><![CDATA[JPPD]]></category>
		<guid isPermaLink="false">http://www.minniebaby.tech/?p=3448</guid>

					<description><![CDATA[本案例来自同事咨询我的一个sql案例，数据库版本为11.2.0.4，经过同事的分 &#8230; <a href="http://www.minniebaby.tech/2023/11/15/troubleshooting-not-jppd-cause-view-is-a-set-query-block/">继续阅读 <span class="meta-nav">&#8594;</span></a>]]></description>
		
					<wfw:commentRss>http://www.minniebaby.tech/2023/11/15/troubleshooting-not-jppd-cause-view-is-a-set-query-block/feed/</wfw:commentRss>
			<slash:comments>0</slash:comments>
		
		
			</item>
	</channel>
</rss>
