geqo_selection_bias
Controls the selection bias used by GEQO. The selection bias is the selective pressure within the population. Values can be from 1.50 to 2.00; the latter is the default.
英文手册覆盖始于 PostgreSQL 7.4. 来源历史与运行验证各自保留独立版本边界。
当前阅读 PG 18·选择有来源记录的版本
此版本暂无所选语言的定义，以下显示原始英文内容。
- boot val
- 2
- category
- Query Tuning / Genetic Query Optimizer
- context
- user
- documented
- true
- enumvals
- 未知
- extra desc
- 未知
- lang
- en
- max val
- 2
- metadata version
- 18
- min val
- 1.5
- name
- geqo_selection_bias
- short desc
- GEQO: selective pressure within the population.
- source
- pg-settings-source-snapshot
- unit
- 未知
- vartype
- real
版本定义 PG 18
Controls the selection bias used by GEQO. The selection bias is the selective pressure within the population. Values can be from 1.50 to 2.00; the latter is the default.
比较版本
来源引用
定义来源
center · PostgreSQL 18 · english-manuals:f1b0f9ae5b2c8f229c723a69159f42ebc4e758d06523a6b271a7f1724b9a1623
正文语言: en · english-manuals:f1b0f9ae5b2c8f229c723a69159f42ebc4e758d06523a6b271a7f1724b9a1623