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authorTom Lane <tgl@sss.pgh.pa.us>2022-03-24 11:47:41 -0400
committerTom Lane <tgl@sss.pgh.pa.us>2022-03-24 11:47:41 -0400
commit0bd7af082ace135581bb13a6bd2d88e68c66a3e0 (patch)
tree412ad873ef762b761baaab0577cb4d36b6c0a240 /src/backend/utils/misc/postgresql.conf.sample
parenta47651447f01562dac2e007db03733e750d45b6b (diff)
Invent recursive_worktable_factor GUC to replace hard-wired constant.
Up to now, the planner estimated the size of a recursive query's worktable as 10 times the size of the non-recursive term. It's hard to see how to do significantly better than that automatically, but we can give users control over the multiplier to allow tuning for specific use-cases. The default behavior remains the same. Simon Riggs Discussion: https://postgr.es/m/CANbhV-EuaLm4H3g0+BSTYHEGxJj3Kht0R+rJ8vT57Dejnh=_nA@mail.gmail.com
Diffstat (limited to 'src/backend/utils/misc/postgresql.conf.sample')
-rw-r--r--src/backend/utils/misc/postgresql.conf.sample1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index 4cf5b26a363..b933fade8c6 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -426,6 +426,7 @@
# JOIN clauses
#plan_cache_mode = auto # auto, force_generic_plan or
# force_custom_plan
+#recursive_worktable_factor = 10.0 # range 0.001-1000000
#------------------------------------------------------------------------------