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Alberto Dell’Era’s blog

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This is my ole good blog, mostly on Oracle. Kept because I’m attached to it and because it still contains relevant information

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Alberto Dell’Era’s blog

author

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2025-12-26 02:02:47

raw text

Alberto Dell’Era’s blog | This is my ole good blog, mostly on Oracle. Kept because I’m attached to it and because it still contains relevant information Alberto Dell'Era's blog About me Featured Links Posts Jun 23, 2016 "ASH math" of time_waited explained with pictures and simulation As explained by John Beresniewicz, Graham Wood and Uri Shaft in their excellent overview ASH architecture and advanced usage , avg( v$active_session_history.time_waited ) is not a correct estimate of the average latency (the “true average”) esperienced by a wait event, the reason being that short events are less likely to be sampled. In order to correct this, the authors propose a formula that gives an unbiased estimate of the “true average”. Aug 23, 2013 Fast refresh of aggregate-only materialized views with MAX - algorithm In this post I will illustrate the algorithm used by Oracle (in 11.2.0.3) to fast refresh a materialized view (MV) containing only the MAX a...

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