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	<title>5.7 - 四号程序员</title>
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		<title>MySQL 8性能低(于5.7)原因排查</title>
		<link>https://www.coder4.com/archives/7596</link>
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		<pubDate>Tue, 14 Dec 2021 09:37:41 +0000</pubDate>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[数据库技术]]></category>
		<category><![CDATA[5.7]]></category>
		<category><![CDATA[8]]></category>
		<category><![CDATA[MySQL]]></category>
		<category><![CDATA[性能差]]></category>
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					<description><![CDATA[在前文 《阿里云自建MySQL的性能测试(多配置对比)》中，我们发现MySQL 8比MySQL5.7的性能低了33%，今天有空，重新探索了下原因(然而并没有彻底解决）。 1 默认参数差异 根据查阅资料，两者主要有以下默认参数差异： have_query_cache，8中cache被干没了 bin-log，8开启，5.7没开启 innodb_flush_neighbors，8关闭，5.7开启 2 实验1：5.7关闭cache mysql -pmysql123 -e[......] 继续阅读]]></description>
		
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