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More infrastructure for btree compaction project. Tree-traversal code

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now knows what to do upon hitting a dead page (in theory anyway, it's
untested...).  Add a post-VACUUM-cleanup entry point for index AMs, to
provide a place for dead-page scavenging to happen.
Also, fix oversight that broke btpo_prev links in temporary indexes.
initdb forced due to additions in pg_am.
This commit is contained in:
Tom Lane
2003-02-22 00:45:05 +00:00
parent 4fff132d1b
commit 799bc58dc7
18 changed files with 709 additions and 345 deletions
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78
src/backend/commands/vacuumlazy.c
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@@ -31,7 +31,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.23 2002/11/13 00:39:46 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.24 2003/02/22 00:45:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -200,7 +200,6 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
tups_vacuumed,
nkeep,
nunused;
bool did_vacuum_index = false;
int i;
VacRUsage ru0;
@@ -244,7 +243,6 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
/* Remove index entries */
for (i = 0; i < nindexes; i++)
lazy_vacuum_index(Irel[i], vacrelstats);
did_vacuum_index = true;
/* Remove tuples from heap */
lazy_vacuum_heap(onerel, vacrelstats);
/* Forget the now-vacuumed tuples, and press on */
@@ -415,7 +413,7 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
vacrelstats->rel_tuples = num_tuples;
/* If any tuples need to be deleted, perform final vacuum cycle */
/* XXX put a threshold on min nuber of tuples here? */
/* XXX put a threshold on min number of tuples here? */
if (vacrelstats->num_dead_tuples > 0)
{
/* Remove index entries */
@@ -424,9 +422,9 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
/* Remove tuples from heap */
lazy_vacuum_heap(onerel, vacrelstats);
}
else if (!did_vacuum_index)
else
{
/* Scan indexes just to update pg_class statistics about them */
/* Must do post-vacuum cleanup and statistics update anyway */
for (i = 0; i < nindexes; i++)
lazy_scan_index(Irel[i], vacrelstats);
}
@@ -551,42 +549,36 @@ static void
lazy_scan_index(Relation indrel, LVRelStats *vacrelstats)
{
IndexBulkDeleteResult *stats;
IndexVacuumCleanupInfo vcinfo;
VacRUsage ru0;
vac_init_rusage(&ru0);
/*
* If the index is not partial, skip the scan, and just assume it has
* the same number of tuples as the heap.
*/
if (!vac_is_partial_index(indrel))
{
vac_update_relstats(RelationGetRelid(indrel),
RelationGetNumberOfBlocks(indrel),
vacrelstats->rel_tuples,
false);
return;
}
/*
* If index is unsafe for concurrent access, must lock it; but a
* shared lock should be sufficient.
* If index is unsafe for concurrent access, must lock it.
*/
if (!indrel->rd_am->amconcurrent)
LockRelation(indrel, AccessShareLock);
LockRelation(indrel, AccessExclusiveLock);
/*
* Even though we're not planning to delete anything, use the
* ambulkdelete call, so that the scan happens within the index AM for
* more speed.
* Even though we're not planning to delete anything, we use the
* ambulkdelete call, because (a) the scan happens within the index AM
* for more speed, and (b) it may want to pass private statistics to
* the amvacuumcleanup call.
*/
stats = index_bulk_delete(indrel, dummy_tid_reaped, NULL);
/* Do post-VACUUM cleanup, even though we deleted nothing */
vcinfo.vacuum_full = false;
vcinfo.message_level = elevel;
stats = index_vacuum_cleanup(indrel, &vcinfo, stats);
/*
* Release lock acquired above.
*/
if (!indrel->rd_am->amconcurrent)
UnlockRelation(indrel, AccessShareLock);
UnlockRelation(indrel, AccessExclusiveLock);
if (!stats)
return;
@@ -596,9 +588,9 @@ lazy_scan_index(Relation indrel, LVRelStats *vacrelstats)
stats->num_pages, stats->num_index_tuples,
false);
elog(elevel, "Index %s: Pages %u; Tuples %.0f.\n\t%s",
elog(elevel, "Index %s: Pages %u, %u free; Tuples %.0f.\n\t%s",
RelationGetRelationName(indrel),
stats->num_pages, stats->num_index_tuples,
stats->num_pages, stats->pages_free, stats->num_index_tuples,
vac_show_rusage(&ru0));
pfree(stats);
@@ -617,6 +609,7 @@ static void
lazy_vacuum_index(Relation indrel, LVRelStats *vacrelstats)
{
IndexBulkDeleteResult *stats;
IndexVacuumCleanupInfo vcinfo;
VacRUsage ru0;
vac_init_rusage(&ru0);
@@ -630,26 +623,33 @@ lazy_vacuum_index(Relation indrel, LVRelStats *vacrelstats)
/* Do bulk deletion */
stats = index_bulk_delete(indrel, lazy_tid_reaped, (void *) vacrelstats);
/* Do post-VACUUM cleanup */
vcinfo.vacuum_full = false;
vcinfo.message_level = elevel;
stats = index_vacuum_cleanup(indrel, &vcinfo, stats);
/*
* Release lock acquired above.
*/
if (!indrel->rd_am->amconcurrent)
UnlockRelation(indrel, AccessExclusiveLock);
if (!stats)
return;
/* now update statistics in pg_class */
if (stats)
{
vac_update_relstats(RelationGetRelid(indrel),
stats->num_pages, stats->num_index_tuples,
false);
vac_update_relstats(RelationGetRelid(indrel),
stats->num_pages, stats->num_index_tuples,
false);
elog(elevel, "Index %s: Pages %u; Tuples %.0f: Deleted %.0f.\n\t%s",
RelationGetRelationName(indrel), stats->num_pages,
stats->num_index_tuples, stats->tuples_removed,
vac_show_rusage(&ru0));
elog(elevel, "Index %s: Pages %u, %u free; Tuples %.0f: Deleted %.0f.\n\t%s",
RelationGetRelationName(indrel),
stats->num_pages, stats->pages_free,
stats->num_index_tuples, stats->tuples_removed,
vac_show_rusage(&ru0));
pfree(stats);
}
pfree(stats);
}
/*