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Add GUCs for predicate lock promotion thresholds.

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Defaults match the fixed behavior of prior releases, but now DBAs
have better options to tune serializable workloads.

It might be nice to be able to set this per relation, but that part
will need to wait for another release.

Author: Dagfinn Ilmari Mannsåker
This commit is contained in:
Kevin Grittner
2017-04-07 21:38:05 -05:00
parent 9c7f5229ad
commit c63172d60f
6 changed files with 98 additions and 18 deletions
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4
src/backend/utils/misc/postgresql.conf.sample
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@ -593,6 +593,10 @@
# (change requires restart)
#max_pred_locks_per_transaction = 64 # min 10
# (change requires restart)
#max_pred_locks_per_relation = -2 # negative values mean
# (max_pred_locks_per_transaction
# / -max_pred_locks_per_relation) - 1
#max_pred_locks_per_page = 2 # min 0
#------------------------------------------------------------------------------