jovial
发表于 2025-3-27 01:02:29
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不透明性
发表于 2025-3-27 01:46:17
Law as an Artifact: An Assessment operates in two different modes: normal and tuning. When a SQL statement executes, the optimizer operates in normal mode and quickly identifies a reasonable execution plan. In this mode, the optimizer spends only a fraction of a second to determine the optimal plan.
火海
发表于 2025-3-27 08:56:06
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Middle-Ear
发表于 2025-3-27 11:35:15
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amnesia
发表于 2025-3-27 17:30:26
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澄清
发表于 2025-3-27 18:21:41
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Mri485
发表于 2025-3-28 01:13:27
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分解
发表于 2025-3-28 03:29:29
Specialized Indexes,ate and manage index organized tables. This chapter explains several specialized indexes that you can create for serving various needs. Most of these specialized indexes are actually B-tree indexes, so it’s not the organization of the index that makes them special. For example, an invisible index is
jocular
发表于 2025-3-28 08:35:38
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Blasphemy
发表于 2025-3-28 11:06:13
Tuning Index Usage, most important index access paths available to the optimizer. Often, Oracle database administrators are bewildered when the optimizer chooses not to use what they believe is a very useful index, but does a full table scan instead. This chapter devotes attention to exploring some reasons why the opt