Set pd_prune_xid on insert Now that on-access pruning can update the visibility map (VM) during read-only queries, set the page’s pd_prune_xid hint during INSERT and on the new page during UPDATE.
This allows heap_page_prune_and_freeze() to set the VM the first time a page is read after being filled with tuples. This may avoid I/O amplification by setting the page all-visible when it is still in shared buffers and allowing later vacuums to skip scanning the page. It also enables index-only scans of newly inserted data much sooner. As a side benefit, this addresses a long-standing note in heap_insert() and heap_multi_insert(): aborted inserts can now be pruned on-access rather than lingering until the next VACUUM. Author: Melanie Plageman <[email protected]> Reviewed-by: Andres Freund <[email protected]> Reviewed-by: Chao Li <[email protected]> Discussion: https://postgr.es/m/flat/CAAKRu_ZMw6Npd_qm2KM%2BFwQ3cMOMx1Dh3VMhp8-V7SOLxdK9-g%40mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/378a216187aea1b488ce60ed07dd1ac5c14a9984 Modified Files -------------- src/backend/access/heap/heapam.c | 39 ++++++++++++++++++++++------------- src/backend/access/heap/heapam_xlog.c | 19 ++++++++++++++++- src/backend/access/heap/pruneheap.c | 18 +++++++--------- 3 files changed, 51 insertions(+), 25 deletions(-)
