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Increase hash_mem_multiplier default to 2.0.

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Double the default setting for hash_mem_multiplier, from 1.0 to 2.0.
This setting makes hash-based executor nodes use twice the usual
work_mem limit.

The PostgreSQL 15 release notes should have a compatibility note about
this change.

Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-Wzndc_ROk6CY-bC6p9O53q974Y0Ey4WX8jcPbuTZYM4Q3A@mail.gmail.com
This commit is contained in:
Peter Geoghegan
2022-02-16 18:41:52 -08:00
parent 74388a1ac3
commit 8f388f6f55
10 changed files with 52 additions and 9 deletions
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src/backend/utils/misc/postgresql.conf.sample
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@@ -136,7 +136,7 @@
# Caution: it is not advisable to set max_prepared_transactions nonzero unless
# you actively intend to use prepared transactions.
#work_mem = 4MB # min 64kB
#hash_mem_multiplier = 1.0 # 1-1000.0 multiplier on hash table work_mem
#hash_mem_multiplier = 2.0 # 1-1000.0 multiplier on hash table work_mem
#maintenance_work_mem = 64MB # min 1MB
#autovacuum_work_mem = -1 # min 1MB, or -1 to use maintenance_work_mem
#logical_decoding_work_mem = 64MB # min 64kB