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| author | Thomas Munro <tmunro@postgresql.org> | 2023-09-05 18:26:12 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2023-09-05 19:53:43 +1200 |
| commit | f691f5b80a85c66d715b4340ffabb503eb19393e (patch) | |
| tree | 26a06c87096de2f9571956b4370ccbf1852d4cba /src/backend/utils/misc/guc_tables.c | |
| parent | aa0d3504560d40f4300a3d49d1c6c3bfc3b894e5 (diff) | |
| download | postgresql-f691f5b80a85c66d715b4340ffabb503eb19393e.tar.gz postgresql-f691f5b80a85c66d715b4340ffabb503eb19393e.zip | |
Remove the "snapshot too old" feature.
Remove the old_snapshot_threshold setting and mechanism for producing
the error "snapshot too old", originally added by commit 848ef42b.
Unfortunately it had a number of known problems in terms of correctness
and performance, mostly reported by Andres in the course of his work on
snapshot scalability. We agreed to remove it, after a long period
without an active plan to fix it.
This is certainly a desirable feature, and someone might propose a new
or improved implementation in the future.
Reported-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CACG%3DezYV%2BEvO135fLRdVn-ZusfVsTY6cH1OZqWtezuEYH6ciQA%40mail.gmail.com
Discussion: https://postgr.es/m/20200401064008.qob7bfnnbu4w5cw4%40alap3.anarazel.de
Discussion: https://postgr.es/m/CA%2BTgmoY%3Daqf0zjTD%2B3dUWYkgMiNDegDLFjo%2B6ze%3DWtpik%2B3XqA%40mail.gmail.com
Diffstat (limited to 'src/backend/utils/misc/guc_tables.c')
| -rw-r--r-- | src/backend/utils/misc/guc_tables.c | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/src/backend/utils/misc/guc_tables.c b/src/backend/utils/misc/guc_tables.c index e565a3092f6..4107d0a7355 100644 --- a/src/backend/utils/misc/guc_tables.c +++ b/src/backend/utils/misc/guc_tables.c @@ -3283,17 +3283,6 @@ struct config_int ConfigureNamesInt[] = }, { - {"old_snapshot_threshold", PGC_POSTMASTER, RESOURCES_ASYNCHRONOUS, - gettext_noop("Time before a snapshot is too old to read pages changed after the snapshot was taken."), - gettext_noop("A value of -1 disables this feature."), - GUC_UNIT_MIN - }, - &old_snapshot_threshold, - -1, -1, MINS_PER_HOUR * HOURS_PER_DAY * 60, - NULL, NULL, NULL - }, - - { {"tcp_keepalives_idle", PGC_USERSET, CONN_AUTH_TCP, gettext_noop("Time between issuing TCP keepalives."), gettext_noop("A value of 0 uses the system default."), |