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Optimize vacuuming of relations with no indexes.

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If there are no indexes on a relation, items can be marked LP_UNUSED
instead of LP_DEAD when pruning. This significantly reduces WAL
volume, since we no longer need to emit one WAL record for pruning
and a second to change the LP_DEAD line pointers thus created to
LP_UNUSED.

Melanie Plageman, reviewed by Andres Freund, Peter Geoghegan, and me

Discussion: https://postgr.es/m/CAAKRu_bgvb_k0gKOXWzNKWHt560R0smrGe3E8zewKPs8fiMKkw%40mail.gmail.com
This commit is contained in:
Robert Haas
2024-01-18 10:03:42 -05:00
parent 7b1dbf0a8d
commit c120550edb
3 changed files with 108 additions and 102 deletions
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src/include/access/heapam.h
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@@ -320,6 +320,7 @@ struct GlobalVisState;
extern void heap_page_prune_opt(Relation relation, Buffer buffer);
extern void heap_page_prune(Relation relation, Buffer buffer,
struct GlobalVisState *vistest,
bool mark_unused_now,
PruneResult *presult,
OffsetNumber *off_loc);
extern void heap_page_prune_execute(Buffer buffer,