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  All About Oracle's Touch-Count Data Block Buffer Algorithm (Jan 2004)



 
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Oracle introduced a touch-count based data buffer management algorithm to address the growing size, performance requirements, and complexities of current day systems. Data block buffers are no longer managed using a modified least recently used (LRU) algorithm. The touch-count based algorithm introduced in Oracle 8i significantly reduces latch contention, forces buffers to earn their way higher up an LRU, and allows for increased granular buffer performance optimization opportunities. This paper details Oracle's touch-count algorithm, how to monitor its performance, and how to manage for optimal performance.

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