Prevent index-only scans from returning wrong answers under Hot Standby. The alternative of disallowing index-only scans in HS operation was discussed, but the consensus was that it was better to treat marking a page all-visible as a recovery conflict for snapshots that could still fail to see XIDs on that page. We may in the future try to soften this, so that we simply force index scans to do heap fetches in cases where this may be an issue, rather than throwing a hard conflict.
Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/3424bff90f40532527b9cf4f2ad9eaff750682f7 Modified Files -------------- src/backend/access/heap/heapam.c | 18 ++++++++++++++++-- src/backend/access/heap/visibilitymap.c | 9 ++++++--- src/backend/commands/vacuumlazy.c | 11 +++++++++-- src/include/access/heapam.h | 2 +- src/include/access/htup.h | 3 ++- src/include/access/visibilitymap.h | 2 +- src/include/access/xlog_internal.h | 2 +- 7 files changed, 36 insertions(+), 11 deletions(-) -- Sent via pgsql-committers mailing list ([email protected]) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
