Update vacuum comments.
This commit is contained in:
Bruce Momjian
parent
2317e714c8
commit
08fb7375e3
|
|
@ -7,7 +7,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.135 2000/01/15 22:43:22 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.136 2000/01/19 22:23:00 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
@ -285,6 +285,9 @@ vc_getrels(NameData *VacRelP)
|
|||
|
||||
if (NameStr(*VacRelP))
|
||||
{
|
||||
/* we could use the cache here, but it is clearer to use
|
||||
* scankeys for both vacuum cases, bjm 2000/01/19
|
||||
*/
|
||||
ScanKeyEntryInitialize(&key, 0x0, Anum_pg_class_relname,
|
||||
F_NAMEEQ,
|
||||
PointerGetDatum(NameStr(*VacRelP)));
|
||||
|
|
@ -766,7 +769,6 @@ vc_scanheap(VRelStats *vacrelstats, Relation onerel,
|
|||
}
|
||||
else if (!TransactionIdIsInProgress(tuple.t_data->t_xmin))
|
||||
{
|
||||
|
||||
/*
|
||||
* Not Aborted, Not Committed, Not in Progress -
|
||||
* so it's from crashed process. - vadim 11/26/96
|
||||
|
|
@ -817,7 +819,6 @@ vc_scanheap(VRelStats *vacrelstats, Relation onerel,
|
|||
}
|
||||
else if (!TransactionIdIsInProgress(tuple.t_data->t_xmax))
|
||||
{
|
||||
|
||||
/*
|
||||
* Not Aborted, Not Committed, Not in Progress - so it
|
||||
* from crashed process. - vadim 06/02/97
|
||||
|
|
@ -920,7 +921,8 @@ vc_scanheap(VRelStats *vacrelstats, Relation onerel,
|
|||
}
|
||||
else
|
||||
dobufrel = true;
|
||||
if (tempPage != (Page) NULL)
|
||||
|
||||
if (tempPage != (Page) NULL)
|
||||
{ /* Some tuples are gone */
|
||||
PageRepairFragmentation(tempPage);
|
||||
vpc->vpd_free = ((PageHeader) tempPage)->pd_upper - ((PageHeader) tempPage)->pd_lower;
|
||||
|
|
@ -1266,7 +1268,7 @@ vc_rpfheap(VRelStats *vacrelstats, Relation onerel,
|
|||
* This means that in the middle of chain there was
|
||||
* tuple updated by older (than XmaxRecent) xaction
|
||||
* and this tuple is already deleted by me. Actually,
|
||||
* upper part of chain should be removed and seems
|
||||
* upper part of chain should be removed and seems
|
||||
* that this should be handled in vc_scanheap(), but
|
||||
* it's not implemented at the moment and so we
|
||||
* just stop shrinking here.
|
||||
|
|
@ -1307,9 +1309,10 @@ vc_rpfheap(VRelStats *vacrelstats, Relation onerel,
|
|||
if (vc_enough_space(fraged_pages->vpl_pagedesc[i], tlen))
|
||||
break;
|
||||
}
|
||||
if (i == num_fraged_pages) /* can't move item
|
||||
* anywhere */
|
||||
{
|
||||
|
||||
/* can't move item anywhere */
|
||||
if (i == num_fraged_pages)
|
||||
{
|
||||
for (i = 0; i < num_vtmove; i++)
|
||||
{
|
||||
Assert(vtmove[i].vpd->vpd_offsets_used > 0);
|
||||
|
|
@ -1341,16 +1344,12 @@ vc_rpfheap(VRelStats *vacrelstats, Relation onerel,
|
|||
free_vtmove--;
|
||||
num_vtmove++;
|
||||
|
||||
/*
|
||||
* All done ?
|
||||
*/
|
||||
/* All done ? */
|
||||
if (!(tp.t_data->t_infomask & HEAP_UPDATED) ||
|
||||
tp.t_data->t_xmin < XmaxRecent)
|
||||
break;
|
||||
|
||||
/*
|
||||
* Well, try to find tuple with old row version
|
||||
*/
|
||||
/* Well, try to find tuple with old row version */
|
||||
for (;;)
|
||||
{
|
||||
Buffer Pbuf;
|
||||
|
|
@ -1384,9 +1383,9 @@ vc_rpfheap(VRelStats *vacrelstats, Relation onerel,
|
|||
/*
|
||||
* Read above about cases when !ItemIdIsUsed(Citemid)
|
||||
* (child item is removed)... Due to the fact that
|
||||
* at the moment we don't remove unuseful part of
|
||||
* at the moment we don't remove unuseful part of
|
||||
* update-chain, it's possible to get too old
|
||||
* parent row here. Like as in the case which
|
||||
* parent row here. Like as in the case which
|
||||
* caused this problem, we stop shrinking here.
|
||||
* I could try to find real parent row but want
|
||||
* not to do it because of real solution will
|
||||
|
|
@ -1660,7 +1659,7 @@ failed to add item with len = %u to page %u (free space %u, nusd %u, noff %u)",
|
|||
}
|
||||
}
|
||||
|
||||
} /* walk along page */
|
||||
} /* walk along page */
|
||||
|
||||
if (offnum < maxoff && keep_tuples > 0)
|
||||
{
|
||||
|
|
@ -1683,9 +1682,9 @@ failed to add item with len = %u to page %u (free space %u, nusd %u, noff %u)",
|
|||
elog(ERROR, "HEAP_MOVED_IN was not expected (2)");
|
||||
if (tuple.t_data->t_infomask & HEAP_MOVED_OFF)
|
||||
{
|
||||
if (chain_tuple_moved) /* some chains was moved
|
||||
* while */
|
||||
{ /* cleaning this page */
|
||||
/* some chains was moved while */
|
||||
if (chain_tuple_moved)
|
||||
{ /* cleaning this page */
|
||||
Assert(vpc->vpd_offsets_free > 0);
|
||||
for (i = 0; i < vpc->vpd_offsets_free; i++)
|
||||
{
|
||||
|
|
@ -1831,9 +1830,7 @@ failed to add item with len = %u to page %u (free space %u, nusd %u, noff %u)",
|
|||
vacrelstats->num_tuples, keep_tuples);
|
||||
}
|
||||
|
||||
/*
|
||||
* clean moved tuples from last page in Nvpl list
|
||||
*/
|
||||
/* clean moved tuples from last page in Nvpl list */
|
||||
if (vpc->vpd_blkno == blkno - 1 && vpc->vpd_offsets_free > 0)
|
||||
{
|
||||
buf = ReadBuffer(onerel, vpc->vpd_blkno);
|
||||
|
|
|
|||
Loading…
Reference in New Issue