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Changed TOAST relations to have relkind RELKIND_TOASTVALUE.

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Special handling of TOAST relations during VACUUM. TOAST relations
are vacuumed while the lock on the master table is still active.
The ANALYZE flag doesn't propagate to their vacuuming because the
toaster access routines allways use index access ignoring stats, so
why compute them at all.

Protection of TOAST relations against normal INSERT/UPDATE/DELETE
while offering SELECT for debugging purposes.

Jan
This commit is contained in:
Jan Wieck
2000-07-05 16:17:43 +00:00
parent 01e1d8fa9a
commit 6534444d19
4 changed files with 75 additions and 17 deletions
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36
src/backend/commands/vacuum.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.161 2000/06/28 03:31:28 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.162 2000/07/05 16:17:38 wieck Exp $
*
*-------------------------------------------------------------------------
@@ -58,7 +58,7 @@ static void vacuum_init(void);
static void vacuum_shutdown(void);
static void vac_vacuum(NameData *VacRelP, bool analyze, List *anal_cols2);
static VRelList getrels(NameData *VacRelP);
static void vacuum_rel(Oid relid, bool analyze);
static void vacuum_rel(Oid relid, bool analyze, bool is_toastrel);
static void scan_heap(VRelStats *vacrelstats, Relation onerel, VacPageList vacuum_pages, VacPageList fraged_pages);
static void repair_frag(VRelStats *vacrelstats, Relation onerel, VacPageList vacuum_pages, VacPageList fraged_pages, int nindices, Relation *Irel);
static void vacuum_heap(VRelStats *vacrelstats, Relation onerel, VacPageList vacpagelist);
@@ -235,7 +235,7 @@ vac_vacuum(NameData *VacRelP, bool analyze, List *anal_cols2)
/* vacuum each heap relation */
for (cur = vrl; cur != (VRelList) NULL; cur = cur->vrl_next)
{
vacuum_rel(cur->vrl_relid, analyze);
vacuum_rel(cur->vrl_relid, analyze, false);
/* analyze separately so locking is minimized */
if (analyze)
analyze_rel(cur->vrl_relid, anal_cols2, MESSAGE_LEVEL);
@@ -347,7 +347,7 @@ getrels(NameData *VacRelP)
* us to lock the entire database during one pass of the vacuum cleaner.
*/
static void
vacuum_rel(Oid relid, bool analyze)
vacuum_rel(Oid relid, bool analyze, bool is_toastrel)
{
HeapTuple tuple;
Relation onerel;
@@ -361,8 +361,10 @@ vacuum_rel(Oid relid, bool analyze)
i;
VRelStats *vacrelstats;
bool reindex = false;
Oid toast_relid;
StartTransactionCommand();
if (!is_toastrel)
StartTransactionCommand();
/*
* Check for user-requested abort. Note we want this to be inside a
@@ -380,7 +382,8 @@ vacuum_rel(Oid relid, bool analyze)
0, 0, 0);
if (!HeapTupleIsValid(tuple))
{
CommitTransactionCommand();
if (!is_toastrel)
CommitTransactionCommand();
return;
}
@@ -392,6 +395,12 @@ vacuum_rel(Oid relid, bool analyze)
*/
onerel = heap_open(relid, AccessExclusiveLock);
/*
* Remember the relations TOAST relation for later
*
*/
toast_relid = onerel->rd_rel->reltoastrelid;
#ifndef NO_SECURITY
if (!pg_ownercheck(GetPgUserName(), RelationGetRelationName(onerel),
RELNAME))
@@ -399,7 +408,8 @@ vacuum_rel(Oid relid, bool analyze)
elog(NOTICE, "Skipping \"%s\" --- only table owner can VACUUM it",
RelationGetRelationName(onerel));
heap_close(onerel, AccessExclusiveLock);
CommitTransactionCommand();
if (!is_toastrel)
CommitTransactionCommand();
return;
}
#endif
@@ -488,8 +498,18 @@ vacuum_rel(Oid relid, bool analyze)
update_relstats(vacrelstats->relid, vacrelstats->num_pages,
vacrelstats->num_tuples, vacrelstats->hasindex, vacrelstats);
/* If the relation has a secondary toast one, vacuum that too
* while we still hold the lock on the master table. We don't
* need to propagate "analyze" to it, because the toaster
* allways uses hardcoded index access and statistics are
* totally unimportant for toast relations
*/
if (toast_relid != InvalidOid)
vacuum_rel(toast_relid, false, true);
/* next command frees attribute stats */
CommitTransactionCommand();
if (!is_toastrel)
CommitTransactionCommand();
}
/*