基于磁盘的哈希聚合
Recorded source states and original language descriptions. Missing version evidence stays unknown.
The source snapshot records transitions for PostgreSQL 8.1–18. The historical matrix records independent cells for 7.4–18. Neither records support for PostgreSQL 19 or 20; newer versions remain unknown. These source claims are distinct from runtime measurements.
No translation of this description is recorded. The original Chinese description is shown. The source label is retained in Chinese; no translated label is recorded.
性能
Description
Selected version: PostgreSQL 18
No
Compare versions
Original documentation links
Related source snapshot entry · The original source supplies this relationship; each matrix retains its own states.
Complete source facts and provenance
legacy · center · aa48af120863672a1b9a4bc459a27f663558b36a03bfefdbd43802cd7a8b2b98
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"Title": "基于磁盘的哈希聚合",
"BodyHTML": "\u003cp\u003e查询规划器现在可以在预计聚合将超过工作内存时考虑使用哈希聚合。\u003c/p\u003e\n\u003cp\u003e这可以通过两个配置参数进行控制：\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https://www.postgresql.org/docs/13/runtime-config-query.html#GUC-ENABLE-HASHAGG\" rel=\"nofollow\"\u003eenable_hashagg\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"https://www.postgresql.org/docs/13/runtime-config-resource.html#GUC-HASH-MEM-MULTIPLIER\" rel=\"nofollow\"\u003ehash_mem_multiplier\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n",
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