Wiki / 配置参数

Enables or disables the query planner's use of partitionwise join, which allows a join between partitioned tables to be performed by joining the matching partitions. Partitionwise join currently applies only when the join conditions include all the partition keys, which must be of the same data type and have one-to-one matching sets of child partitions. With this setting enabled, the number of nodes whose memory usage is restricted by work_mem appearing in the final plan can increase linearly according to the number of partitions being scanned. This can result in a large increase in overall memory consumption during the execution of the query. Query planning also becomes significantly more expensive in terms of memory and CPU. The default value is off.

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。

此版本暂无所选语言的定义，以下显示原始英文内容。

boot val

off

category

Query Tuning / Planner Method Configuration

context

user

documented

true

enumvals

未知

extra desc

未知

lang

en

max val

未知

metadata version

18

min val

未知

name

enable_partitionwise_join

short desc

Enables partitionwise join.

source

pg-settings-source-snapshot

unit

未知

vartype

bool