11g direct path read介绍:10949 event、_small_table_threshold与_serial_direct_read
2011-12-02 16:03
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在11g之前串行的扫描大表默认总是先将数据读取到Oracle高速缓冲中,其等待事件常为db file scattered read。
从11g开始Oracle通过内部算法来决定串行扫描大表是通过直接路径读direct path read,还是先读入到buffer cache中,此算法依据表的大小评估。
本文出自 “Ask Maclean Liu Oracle” 博客,请务必保留此出处http://maclean.blog.51cto.com/2923249/1278184
从11g开始Oracle通过内部算法来决定串行扫描大表是通过直接路径读direct path read,还是先读入到buffer cache中,此算法依据表的大小评估。
本文出自 “Ask Maclean Liu Oracle” 博客,请务必保留此出处http://maclean.blog.51cto.com/2923249/1278184
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