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Eliminate COPY FREEZE use of XLOG_HEAP2_VISIBLE

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Instead of emitting a separate WAL XLOG_HEAP2_VISIBLE record for setting
bits in the VM, specify the VM block changes in the
XLOG_HEAP2_MULTI_INSERT record.

This halves the number of WAL records emitted by COPY FREEZE.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Kirill Reshke <reshkekirill@gmail.com>
Discussion: https://postgr.es/m/flat/CAAKRu_ZMw6Npd_qm2KM%2BFwQ3cMOMx1Dh3VMhp8-V7SOLxdK9-g%40mail.gmail.com
This commit is contained in:
Melanie Plageman
2025-10-09 16:25:50 -04:00
parent 1b073cba49
commit d96f87332b
5 changed files with 154 additions and 18 deletions
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4
src/include/access/visibilitymap.h
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@@ -18,6 +18,7 @@
#include "access/xlogdefs.h"
#include "storage/block.h"
#include "storage/buf.h"
#include "storage/relfilelocator.h"
#include "utils/relcache.h"
/* Macros for visibilitymap test */
@@ -37,6 +38,9 @@ extern uint8 visibilitymap_set(Relation rel,
Buffer vmBuf,
TransactionId cutoff_xid,
uint8 flags);
extern uint8 visibilitymap_set_vmbits(BlockNumber heapBlk,
Buffer vmBuf, uint8 flags,
const RelFileLocator rlocator);
extern uint8 visibilitymap_get_status(Relation rel, BlockNumber heapBlk, Buffer *vmbuf);
extern void visibilitymap_count(Relation rel, BlockNumber *all_visible, BlockNumber *all_frozen);
extern BlockNumber visibilitymap_prepare_truncate(Relation rel,