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Change to the pager to avoid opening journal files unnecessarily. This can

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sometimes results in a significant speed improvement. (CVS 791)

FossilOrigin-Name: fa5c042585c601449ede7319d0c5993cd8ba75a4
This commit is contained in:
drh
2002-12-02 04:25:19 +00:00
parent d0d006e29c
commit da47d7748f
11 changed files with 146 additions and 87 deletions
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12
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 1.72 2002/09/01 23:20:45 drh Exp $
** $Id: btree.c,v 1.73 2002/12/02 04:25:20 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -551,7 +551,7 @@ static void freeSpace(Btree *pBt, MemPage *pPage, int start, int size){
** pParent==NULL.
**
** Return SQLITE_OK on success. If we see that the page does
** not contained a well-formed database page, then return
** not contain a well-formed database page, then return
** SQLITE_CORRUPT. Note that a return of SQLITE_OK does not
** guarantee that the page is well-formed. It only shows that
** we failed to detect any corruption.
@@ -658,7 +658,7 @@ static void pageDestructor(void *pData){
*/
int sqliteBtreeOpen(
const char *zFilename, /* Name of the file containing the BTree database */
int mode, /* Not currently used */
int omitJournal, /* if TRUE then do not journal this file */
int nCache, /* How many pages in the page cache */
Btree **ppBtree /* Pointer to new Btree object written here */
){
@@ -671,7 +671,8 @@ int sqliteBtreeOpen(
return SQLITE_NOMEM;
}
if( nCache<10 ) nCache = 10;
rc = sqlitepager_open(&pBt->pPager, zFilename, nCache, EXTRA_SIZE);
rc = sqlitepager_open(&pBt->pPager, zFilename, nCache, EXTRA_SIZE,
!omitJournal);
if( rc!=SQLITE_OK ){
if( pBt->pPager ) sqlitepager_close(pBt->pPager);
sqliteFree(pBt);
@@ -699,7 +700,7 @@ int sqliteBtreeClose(Btree *pBt){
}
/*
** Change the limit on the number of pages allowed the cache.
** Change the limit on the number of pages allowed in the cache.
**
** The maximum number of cache pages is set to the absolute
** value of mxPage. If mxPage is negative, the pager will
@@ -1663,6 +1664,7 @@ static int freePage(Btree *pBt, void *pPage, Pgno pgno){
pgno = sqlitepager_pagenumber(pOvfl);
}
assert( pgno>2 );
assert( sqlitepager_pagenumber(pOvfl)==pgno );
pMemPage = (MemPage*)pPage;
pMemPage->isInit = 0;
if( pMemPage->pParent ){