<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[mutou88的专栏]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/mutou88</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; mutou88]]></copyright><item><title><![CDATA[Oracle学习疑问]]></title><link>https://blog.youkuaiyun.com/mutou88/article/details/6182315</link><guid>https://blog.youkuaiyun.com/mutou88/article/details/6182315</guid><author>mutou88</author><pubDate>Sun, 13 Feb 2011 14:00:00 +0800</pubDate><description><![CDATA[<br />1. ROLLBACK时，之前已经刷新输出至日志文件的redo条目会怎么处理？]]></description><category></category></item><item><title><![CDATA[DBWn什么时候写数据文件]]></title><link>https://blog.youkuaiyun.com/mutou88/article/details/6182155</link><guid>https://blog.youkuaiyun.com/mutou88/article/details/6182155</guid><author>mutou88</author><pubDate>Sun, 13 Feb 2011 12:03:00 +0800</pubDate><description><![CDATA[什么时候dbwr会把数据写入数据文件呢？下面这几种情况：1．当Buffer Cache中的Dirty List长度达到阀值：DBWR将Dirty List中的Dirty Buffer写入磁盘（user Server Process在LRU List中查找free buffer时将碰到的dirty blocks移入Dirty List）2．当user Server Process在Buffer Cache的LRU List中搜索了过长的时间而仍然没有找到free buffer：DBWR直接从LRU List中]]></description><category></category></item></channel></rss>