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Make auto-vacuum a run-time option (default determined by SQLITE_DEFAULT_AUTOVACUUM macro). (CVS 2067)

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FossilOrigin-Name: b9d5f007fc32d4f471e0e11cc4baadb100612878
This commit is contained in:
danielk1977
2004-11-05 15:45:09 +00:00
parent 87a6e7318f
commit 951af8050b
6 changed files with 133 additions and 20 deletions
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45
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 1.209 2004/11/05 12:58:25 danielk1977 Exp $
** $Id: btree.c,v 1.210 2004/11/05 15:45:10 danielk1977 Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -1192,6 +1192,9 @@ int sqlite3BtreeOpen(
pBt->maxEmbedFrac = 64; /* 25% */
pBt->minEmbedFrac = 32; /* 12.5% */
pBt->minLeafFrac = 32; /* 12.5% */
if( zFilename && strcmp(zFilename,":memory:") ){
pBt->autoVacuum = SQLITE_DEFAULT_AUTOVACUUM;
}
nReserve = 0;
}else{
nReserve = zDbHeader[20];
@@ -1199,17 +1202,14 @@ int sqlite3BtreeOpen(
pBt->minEmbedFrac = zDbHeader[22];
pBt->minLeafFrac = zDbHeader[23];
pBt->pageSizeFixed = 1;
#ifndef SQLITE_OMIT_AUTOVACUUM
pBt->autoVacuum = (get4byte(&zDbHeader[36 + 4*4])?1:0);
#endif
}
pBt->usableSize = pBt->pageSize - nReserve;
pBt->psAligned = FORCE_ALIGNMENT(pBt->pageSize);
sqlite3pager_set_pagesize(pBt->pPager, pBt->pageSize);
*ppBtree = pBt;
#ifdef SQLITE_AUTOVACUUM
/* Note: This is temporary code for use during development of auto-vacuum. */
if( zFilename && 0!=strcmp(zFilename, ":memory:") ){
pBt->autoVacuum = 1;
}
#endif
return SQLITE_OK;
}
@@ -1305,6 +1305,37 @@ int sqlite3BtreeGetReserve(Btree *pBt){
return pBt->pageSize - pBt->usableSize;
}
/*
** Change the 'auto-vacuum' property of the database. If the 'autoVacuum'
** parameter is non-zero, then auto-vacuum mode is enabled. If zero, it
** is disabled. The default value for the auto-vacuum property is
** determined by the SQLITE_DEFAULT_AUTOVACUUM macro.
*/
int sqlite3BtreeSetAutoVacuum(Btree *pBt, int autoVacuum){
#ifdef SQLITE_OMIT_AUTOVACUUM
return SQLITE_READONLY
#else
if( pBt->pageSizeFixed ){
return SQLITE_READONLY;
}
pBt->autoVacuum = (autoVacuum?1:0);
return SQLITE_OK;
#endif
}
/*
** Return the value of the 'auto-vacuum' property. If auto-vacuum is
** enabled 1 is returned. Otherwise 0.
*/
int sqlite3BtreeGetAutoVacuum(Btree *pBt){
#ifdef SQLITE_OMIT_AUTOVACUUM
return 0;
#else
return pBt->autoVacuum;
#endif
}
/*
** Get a reference to pPage1 of the database file. This will
** also acquire a readlock on that file.