diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/access/heap/vacuumlazy.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c index e4015037951..98ccb98825b 100644 --- a/src/backend/access/heap/vacuumlazy.c +++ b/src/backend/access/heap/vacuumlazy.c @@ -94,7 +94,8 @@ #define BYPASS_THRESHOLD_PAGES 0.02 /* i.e. 2% of rel_pages */ /* - * Perform a failsafe check every 4GB during the heap scan, approximately + * Perform a failsafe check each time we scan another 4GB of pages. + * (Note that this is deliberately kept to a power-of-two, usually 2^19.) */ #define FAILSAFE_EVERY_PAGES \ ((BlockNumber) (((uint64) 4 * 1024 * 1024 * 1024) / BLCKSZ)) @@ -821,7 +822,6 @@ lazy_scan_heap(LVRelState *vacrel) BlockNumber rel_pages = vacrel->rel_pages, blkno, next_unskippable_block, - next_failsafe_block = 0, next_fsm_block_to_vacuum = 0; VacDeadItems *dead_items = vacrel->dead_items; Buffer vmbuffer = InvalidBuffer; @@ -895,11 +895,8 @@ lazy_scan_heap(LVRelState *vacrel) * one-pass strategy, and the two-pass strategy with the index_cleanup * param set to 'off'. */ - if (blkno - next_failsafe_block >= FAILSAFE_EVERY_PAGES) - { + if (vacrel->scanned_pages % FAILSAFE_EVERY_PAGES == 0) lazy_check_wraparound_failsafe(vacrel); - next_failsafe_block = blkno; - } /* * Consider if we definitely have enough space to process TIDs on page |