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Update vacuum comments.

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This commit is contained in:
Bruce Momjian 2000-01-19 22:23:00 +00:00
parent 2317e714c8
commit 08fb7375e3
1 changed files with 20 additions and 23 deletions
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43
src/backend/commands/vacuum.c
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@ -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);