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Commit35192f0

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Have VACUUM log number of skipped pages due to pins
Author: Jim Nasby, some kibitzing by Heikki Linnankangas.Discussion leading to current behavior and precise wording fueled bythoughts from Robert Haas and Andres Freund.
1 parent4a14f13 commit35192f0

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2 files changed

+72
-28
lines changed

2 files changed

+72
-28
lines changed

‎doc/src/sgml/ref/vacuum.sgml‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -252,6 +252,7 @@ DETAIL: CPU 0.01s/0.06u sec elapsed 0.07 sec.
252252
INFO: "onek": found 3000 removable, 1000 nonremovable tuples in 143 pages
253253
DETAIL: 0 dead tuples cannot be removed yet.
254254
There were 0 unused item pointers.
255+
Skipped 0 pages due to buffer pins.
255256
0 pages are entirely empty.
256257
CPU 0.07s/0.39u sec elapsed 1.56 sec.
257258
INFO: analyzing "public.onek"

‎src/backend/commands/vacuumlazy.c‎

Lines changed: 71 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -105,6 +105,7 @@ typedef struct LVRelStats
105105
BlockNumberold_rel_pages;/* previous value of pg_class.relpages */
106106
BlockNumberrel_pages;/* total number of pages */
107107
BlockNumberscanned_pages;/* number of pages we examined */
108+
BlockNumberpinned_pages;/* # of pages we could not initially lock */
108109
doublescanned_tuples;/* counts only tuples on scanned pages */
109110
doubleold_rel_tuples;/* previous value of pg_class.reltuples */
110111
doublenew_rel_tuples;/* new estimated total # of tuples */
@@ -332,6 +333,7 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
332333
TimestampDifferenceExceeds(starttime,endtime,
333334
Log_autovacuum_min_duration))
334335
{
336+
StringInfoDatabuf;
335337
TimestampDifference(starttime,endtime,&secs,&usecs);
336338

337339
read_rate=0;
@@ -343,27 +345,47 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
343345
write_rate= (double)BLCKSZ*VacuumPageDirty / (1024*1024) /
344346
(secs+usecs /1000000.0);
345347
}
348+
349+
/*
350+
* This is pretty messy, but we split it up so that we can skip
351+
* emitting individual parts of the message when not applicable.
352+
*/
353+
initStringInfo(&buf);
354+
appendStringInfo(&buf,_("automatic vacuum of table \"%s.%s.%s\": index scans: %d\n"),
355+
get_database_name(MyDatabaseId),
356+
get_namespace_name(RelationGetNamespace(onerel)),
357+
RelationGetRelationName(onerel),
358+
vacrelstats->num_index_scans);
359+
appendStringInfo(&buf,_("pages: %d removed, %d remain\n"),
360+
vacrelstats->pages_removed,
361+
vacrelstats->rel_pages);
362+
if (vacrelstats->pinned_pages>0)
363+
{
364+
if (scan_all)
365+
appendStringInfo(&buf,_("waited for %d buffer pins\n"),
366+
vacrelstats->pinned_pages);
367+
else
368+
appendStringInfo(&buf,
369+
_("skipped %d pages due to buffer pins\n"),
370+
vacrelstats->pinned_pages);
371+
}
372+
appendStringInfo(&buf,
373+
_("tuples: %.0f removed, %.0f remain, %.0f are dead but not yet removable\n"),
374+
vacrelstats->tuples_deleted,
375+
vacrelstats->new_rel_tuples,
376+
vacrelstats->new_dead_tuples);
377+
appendStringInfo(&buf,
378+
_("buffer usage: %d hits, %d misses, %d dirtied\n"),
379+
VacuumPageHit,
380+
VacuumPageMiss,
381+
VacuumPageDirty);
382+
appendStringInfo(&buf,_("avg read rate: %.3f MB/s, avg write rate: %.3f MB/s\n"),
383+
read_rate,write_rate);
384+
appendStringInfo(&buf,_("system usage: %s"),pg_rusage_show(&ru0));
385+
346386
ereport(LOG,
347-
(errmsg("automatic vacuum of table \"%s.%s.%s\": index scans: %d\n"
348-
"pages: %d removed, %d remain\n"
349-
"tuples: %.0f removed, %.0f remain, %.0f are dead but not yet removable\n"
350-
"buffer usage: %d hits, %d misses, %d dirtied\n"
351-
"avg read rate: %.3f MB/s, avg write rate: %.3f MB/s\n"
352-
"system usage: %s",
353-
get_database_name(MyDatabaseId),
354-
get_namespace_name(RelationGetNamespace(onerel)),
355-
RelationGetRelationName(onerel),
356-
vacrelstats->num_index_scans,
357-
vacrelstats->pages_removed,
358-
vacrelstats->rel_pages,
359-
vacrelstats->tuples_deleted,
360-
vacrelstats->new_rel_tuples,
361-
vacrelstats->new_dead_tuples,
362-
VacuumPageHit,
363-
VacuumPageMiss,
364-
VacuumPageDirty,
365-
read_rate,write_rate,
366-
pg_rusage_show(&ru0))));
387+
(errmsg_internal("%s",buf.data)));
388+
pfree(buf.data);
367389
}
368390
}
369391
}
@@ -438,6 +460,7 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
438460
BlockNumbernext_not_all_visible_block;
439461
boolskipping_all_visible_blocks;
440462
xl_heap_freeze_tuple*frozen;
463+
StringInfoDatabuf;
441464

442465
pg_rusage_init(&ru0);
443466

@@ -611,6 +634,8 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
611634
/* We need buffer cleanup lock so that we can prune HOT chains. */
612635
if (!ConditionalLockBufferForCleanup(buf))
613636
{
637+
vacrelstats->pinned_pages++;
638+
614639
/*
615640
* If we're not scanning the whole relation to guard against XID
616641
* wraparound, it's OK to skip vacuuming a page. The next vacuum
@@ -1094,19 +1119,37 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
10941119
RelationGetRelationName(onerel),
10951120
tups_vacuumed,vacuumed_pages)));
10961121

1122+
/*
1123+
* This is pretty messy, but we split it up so that we can skip emitting
1124+
* individual parts of the message when not applicable.
1125+
*/
1126+
initStringInfo(&buf);
1127+
appendStringInfo(&buf,
1128+
_("%.0f dead row versions cannot be removed yet.\n"),
1129+
nkeep);
1130+
appendStringInfo(&buf,_("There were %.0f unused item pointers.\n"),
1131+
nunused);
1132+
if (vacrelstats->pinned_pages>0)
1133+
{
1134+
if (scan_all)
1135+
appendStringInfo(&buf,_("Waited for %d buffer pins.\n"),
1136+
vacrelstats->pinned_pages);
1137+
else
1138+
appendStringInfo(&buf,_("Skipped %u pages due to buffer pins.\n"),
1139+
vacrelstats->pinned_pages);
1140+
}
1141+
appendStringInfo(&buf,_("%u pages are entirely empty.\n"),
1142+
empty_pages);
1143+
appendStringInfo(&buf,_("%s."),
1144+
pg_rusage_show(&ru0));
1145+
10971146
ereport(elevel,
10981147
(errmsg("\"%s\": found %.0f removable, %.0f nonremovable row versions in %u out of %u pages",
10991148
RelationGetRelationName(onerel),
11001149
tups_vacuumed,num_tuples,
11011150
vacrelstats->scanned_pages,nblocks),
1102-
errdetail("%.0f dead row versions cannot be removed yet.\n"
1103-
"There were %.0f unused item pointers.\n"
1104-
"%u pages are entirely empty.\n"
1105-
"%s.",
1106-
nkeep,
1107-
nunused,
1108-
empty_pages,
1109-
pg_rusage_show(&ru0))));
1151+
errdetail_internal("%s",buf.data)));
1152+
pfree(buf.data);
11101153
}
11111154

11121155

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