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Bug fix in the computation of the number of pages to autovacuum when

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nReserve is greater than zero. (CVS 6880)

FossilOrigin-Name: 618a83d65f973183d21245721dc656a35ff594a4
This commit is contained in:
drh
2009-07-11 17:04:08 +00:00
parent a4ec1d443a
commit 41d628c123
3 changed files with 17 additions and 15 deletions
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18
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.678 2009/07/11 13:13:12 drh Exp $
** $Id: btree.c,v 1.679 2009/07/11 17:04:09 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** See the header comment on "btreeInt.h" for additional information.
@@ -2852,13 +2852,14 @@ static int autoVacuumCommit(BtShared *pBt){
invalidateAllOverflowCache(pBt);
assert(pBt->autoVacuum);
if( !pBt->incrVacuum ){
Pgno nFin;
Pgno nFree;
Pgno nPtrmap;
Pgno iFree;
const int pgsz = pBt->pageSize;
Pgno nOrig = pagerPagecount(pBt);
Pgno nFin; /* Number of pages to be freed */
Pgno nFree; /* Number of pages no the freelist */
Pgno nPtrmap; /* Number of PtrMap pages to be freed */
Pgno iFree; /* The next page to be freed */
int nEntry; /* Number of entries on one ptrmap page */
Pgno nOrig; /* Database size before freeing */
nOrig = pagerPagecount(pBt);
if( PTRMAP_ISPAGE(pBt, nOrig) || nOrig==PENDING_BYTE_PAGE(pBt) ){
/* It is not possible to create a database for which the final page
** is either a pointer-map page or the pending-byte page. If one
@@ -2868,7 +2869,8 @@ static int autoVacuumCommit(BtShared *pBt){
}
nFree = get4byte(&pBt->pPage1->aData[36]);
nPtrmap = (nFree-nOrig+PTRMAP_PAGENO(pBt, nOrig)+pgsz/5)/(pgsz/5);
nEntry = pBt->usableSize/5;
nPtrmap = (nFree-nOrig+PTRMAP_PAGENO(pBt, nOrig)+nEntry)/nEntry;
nFin = nOrig - nFree - nPtrmap;
if( nOrig>PENDING_BYTE_PAGE(pBt) && nFin<PENDING_BYTE_PAGE(pBt) ){
nFin--;