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Augment WAL records for btree delete with GetOldestXmin() to reduce

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false positives during Hot Standby conflict processing. Simple
patch to enhance conflict processing, following previous discussions.
Controlled by parameter minimize_standby_conflicts = on | off, with
default off allows measurement of performance impact to see whether
it should be set on all the time.
This commit is contained in:
Simon Riggs
2010-01-29 18:39:05 +00:00
parent d0cfc01823
commit 6d2bc0a6cf
6 changed files with 48 additions and 12 deletions
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src/backend/utils/misc/postgresql.conf.sample
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@ -181,7 +181,10 @@
#archive_timeout = 0 # force a logfile segment switch after this
# number of seconds; 0 disables
# - Hot Standby -
#recovery_connections = on # allows connections during recovery
#minimize_standby_conflicts = on # additional WAL info to avoid conflicts
#max_standby_delay = 30 # max acceptable standby lag (s) to help queries
# complete without conflict; -1 disables