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VACUUM VERBOSE: tweak scanned_pages logic.

2022年3月13日 20:07:49 +0000 (13:07 -0700)

Commit 872770fd6c taught VACUUM VERBOSE and autovacuum logging to
display the total number of pages scanned by VACUUM. This information
was also displayed as a percentage of rel_pages in parenthesis, which
makes it easy to spot trends over time and across tables.

The instrumentation displayed "0 scanned (0.00% of total)" for totally
empty tables. Tweak the instrumentation: have it show "0 scanned
(100.00% of total)" for empty tables instead. This approach is clearer
and more consistent.

src/backend/access/heap/vacuumlazy.c patch | blob | blame | history

diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c

index 620b7a7af5bd6c0b8c7e335e07581b196ba26dd8..87ab7775aee7a84c4e1915c88494c265e2ef254f 100644 (file)

--- a/src/backend/access/heap/vacuumlazy.c

+++ b/src/backend/access/heap/vacuumlazy.c

@@ -676,7 +676,7 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,

vacrel->removed_pages,

vacrel->rel_pages,

vacrel->scanned_pages,

- orig_rel_pages == 0 ? 0 :

+ orig_rel_pages == 0 ? 100.0 :

100.0 * vacrel->scanned_pages / orig_rel_pages);

appendStringInfo(&buf,

_("tuples: %lld removed, %lld remain, %lld are dead but not yet removable\n"),

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