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Lower minimum maintenance_work_mem to 64kB

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Since the introduction of TID store, vacuum uses far less memory in
the common case than in versions 16 and earlier. Invoking multiple
rounds of index vacuuming in turn requires a much larger table. It'd
be a good idea anyway to cover this case in regression testing, and a
lower limit is less painful for slow buildfarm animals. The reason to
do it now is to re-enable coverage of the bugfix in commit 83c39a1f7f.

For consistency, give autovacuum_work_mem the same treatment.

Suggested by Andres Freund
Tested by Melanie Plageman
Backpatch to v17, where TID store was introduced

Discussion: https://postgr.es/m/20240516205458.ohvlzis5b5tvejru@awork3.anarazel.de
Discussion: https://postgr.es/m/20240722164745.fvaoh6g6zprisqgp%40awork3.anarazel.de
This commit is contained in:
John Naylor
2024-08-06 20:38:33 +07:00
parent f5a1311fcc
commit bbf668d66f
3 changed files with 11 additions and 6 deletions
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4
src/backend/utils/misc/postgresql.conf.sample
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@ -139,8 +139,8 @@
# you actively intend to use prepared transactions.
#work_mem = 4MB # min 64kB
#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
#maintenance_work_mem = 64MB # min 64kB
#autovacuum_work_mem = -1 # min 64kB, or -1 to use maintenance_work_mem
#logical_decoding_work_mem = 64MB # min 64kB
#max_stack_depth = 2MB # min 100kB
#shared_memory_type = mmap # the default is the first option