谴责
发表于 2025-3-21 18:25:37
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triptans
发表于 2025-3-21 23:08:42
Volkswirtschaftliche Gesamtrechnungen (VGR),The cost of a nested loop is simple to calculate—but there are special cases, and the most dramatic special case produces yet another reason for checking carefully when you want to add columns to indexes.
transplantation
发表于 2025-3-22 03:44:48
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吹牛需要艺术
发表于 2025-3-22 08:25:38
Jonathan LewisJonathan Lewis is one of the world‘s foremost authorities in this field (he is frequently quoted and reference by other leading experts, such as Tom Kyte – see for example http://asktom.oracle.com/pls
inundate
发表于 2025-3-22 08:59:35
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Immunization
发表于 2025-3-22 15:27:31
Stufen der wirtschaftlichen Entwicklung,three optimizer modes and two (possibly three) major versions of Oracle to check before you start to formulate an answer..Oracle can do all sorts of transformations to your SQL before optimizing it. This means that an execution plan you were expecting to see may have been eliminated by a transformat
Immunization
发表于 2025-3-22 19:01:18
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needle
发表于 2025-3-23 00:42:51
Stufen der wirtschaftlichen Entwicklung,lot of ground. Key points to remember though are as follows:.The typical cost of using a B-tree index comprises three components—the depth of the index, based on the blevel; the number of index leaf blocks that will be visited, based on leaf_blocks; and the number of visits to table blocks, based on
Functional
发表于 2025-3-23 04:13:43
Martin J. Beckmann,Peter Schönfeld that result in an unsuitable value for the clustering_factor..In many cases, we can predict the problems that are likely to happen, and use alternative methods for generating a more appropriate clustering_factor. We can always use the dbms_stats package to patch a correct clustering_factor into pla
保守党
发表于 2025-3-23 08:55:39
Martin J. Beckmann,Peter Schönfeld need to create a histogram on that column..Such columns that hold only a small number of values (less than 255) are good candidates for frequency histograms, but be careful about the rate of change of data and the need to keep the histograms up to date..Oracle may have trouble creating a frequency