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VACUUM VERBOSE: tweak scanned_pages logic.

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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.
This commit is contained in:
Peter Geoghegan 2022-03-13 13:07:49 -07:00
parent 7e12256b47
commit 6e20f4600a
1 changed files with 1 additions and 1 deletions
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2
src/backend/access/heap/vacuumlazy.c
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@ -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"),