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Added: dynamic re-moving page from list of pages usable for shrinking 

if its free-space < min_tuple_len.
This commit is contained in:
Vadim B. Mikheev 1996-11-29 10:27:59 +00:00
parent 7b4426eaea
commit 03659a262e
1 changed files with 60 additions and 3 deletions
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63
src/backend/commands/vacuum.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.10 1996/11/28 04:37:38 vadim Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.11 1996/11/29 10:27:59 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -462,6 +462,7 @@ _vc_scanheap (VRelList curvrl, Relation onerel,
{
int nblocks, blkno;
ItemId itemid;
ItemPointer itemptr;
HeapTuple htup;
Buffer buf;
Page page, tempPage = NULL;
@ -611,6 +612,33 @@ DELETE_TRANSACTION_ID_VALID %d, TUPGONE %d.",
tupgone);
}
/*
* It's possibly! But from where it comes ?
* And should we fix it ? - vadim 11/28/96
*/
itemptr = &(htup->t_ctid);
if ( !ItemPointerIsValid (itemptr) ||
BlockIdGetBlockNumber(&(itemptr->ip_blkid)) != blkno )
{
elog (NOTICE, "ITEM POINTER IS INVALID: %u/%u FOR %u/%u. TUPGONE %d.",
BlockIdGetBlockNumber(&(itemptr->ip_blkid)),
itemptr->ip_posid, blkno, offnum, tupgone);
}
/*
* Other checks...
*/
if ( htup->t_len != itemid->lp_len )
{
elog (NOTICE, "PAGEHEADER' LEN %u IS NOT THE SAME AS HTUP' %u FOR %u/%u.TUPGONE %d.",
itemid->lp_len, htup->t_len, blkno, offnum, tupgone);
}
if ( !OidIsValid(htup->t_oid) )
{
elog (NOTICE, "OID IS INVALID FOR %u/%u.TUPGONE %d.",
blkno, offnum, tupgone);
}
if (tupgone) {
ItemId lpp;
@ -676,6 +704,10 @@ DELETE_TRANSACTION_ID_VALID %d, TUPGONE %d.",
/* save stats in the rel list for use later */
curvrl->vrl_ntups = ntups;
curvrl->vrl_npages = nblocks;
if ( ntups == 0 )
min_tlen = max_tlen = 0;
curvrl->vrl_min_tlen = min_tlen;
curvrl->vrl_max_tlen = max_tlen;
Vvpl->vpl_nemend = nemend;
Fvpl->vpl_nemend = nemend;
@ -746,6 +778,7 @@ _vc_rpfheap (VRelList curvrl, Relation onerel,
InsertIndexResult iresult;
VPageListData Nvpl;
VPageDescr ToVpd = NULL, Fvplast, Vvplast, vpc, *vpp;
int ToVpI = 0;
IndDesc *Idesc, *idcur;
int Fblklast, Vblklast, i;
Size tlen;
@ -872,8 +905,31 @@ _vc_rpfheap (VRelList curvrl, Relation onerel,
! _vc_enough_space (ToVpd, tlen) )
{
if ( ToBuf != InvalidBuffer )
{
WriteBuffer(ToBuf);
ToBuf = InvalidBuffer;
ToBuf = InvalidBuffer;
/*
* If no one tuple can't be added to this page -
* remove page from Fvpl. - vadim 11/27/96
*/
if ( !_vc_enough_space (ToVpd, curvrl->vrl_min_tlen) )
{
if ( ToVpd != Fvplast )
{
Assert ( Fnpages > ToVpI + 1 );
memmove (Fvpl->vpl_pgdesc + ToVpI,
Fvpl->vpl_pgdesc + ToVpI + 1,
sizeof (VPageDescr*) * (Fnpages - ToVpI - 1));
}
Assert ( Fnpages >= 1 );
Fnpages--;
if ( Fnpages == 0 )
break;
/* get prev reapped page from Fvpl */
Fvplast = Fvpl->vpl_pgdesc[Fnpages - 1];
Fblklast = Fvplast->vpd_blkno;
}
}
for (i=0; i < Fnpages; i++)
{
if ( _vc_enough_space (Fvpl->vpl_pgdesc[i], tlen) )
@ -881,7 +937,8 @@ _vc_rpfheap (VRelList curvrl, Relation onerel,
}
if ( i == Fnpages )
break; /* can't move item anywhere */
ToVpd = Fvpl->vpl_pgdesc[i];
ToVpI = i;
ToVpd = Fvpl->vpl_pgdesc[ToVpI];
ToBuf = ReadBuffer(onerel, ToVpd->vpd_blkno);
ToPage = BufferGetPage(ToBuf);
/* if this page was not used before - clean it */