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-rw-r--r--src/backend/utils/misc/guc.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a363441d8f7..f9a5efe100c 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -1853,7 +1853,12 @@ static struct config_int ConfigureNamesInt[] =
},
{
- {"vacuum_defer_cleanup_age", PGC_SIGHUP, REPLICATION_MASTER,
+ /*
+ * Setting this to a higher value without restarting postmaster
+ * can cause various bugs in TOAST object removal, CLUSTER and
+ * possibly other places, so this must be changed only on restart.
+ */
+ {"vacuum_defer_cleanup_age", PGC_POSTMASTER, REPLICATION_MASTER,
gettext_noop("Number of transactions by which VACUUM and HOT cleanup should be deferred, if any."),
NULL
},