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Add the "truncate" journal mode which commits transactions by truncating the

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rollback journal file to zero length and not calling fsync(). (CVS 5745)

FossilOrigin-Name: 7c561f2e9264de676c1028943f6c3d06542fd802
This commit is contained in:
drh
2008-09-26 21:08:08 +00:00
parent 9e2d64b8d3
commit 04335886a1
7 changed files with 92 additions and 29 deletions
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7
src/pragma.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file contains code used to implement the PRAGMA command.
**
** $Id: pragma.c,v 1.187 2008/09/16 14:38:03 danielk1977 Exp $
** $Id: pragma.c,v 1.188 2008/09/26 21:08:08 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -449,13 +449,13 @@ void sqlite3Pragma(
*/
if( sqlite3StrICmp(zLeft,"journal_mode")==0 ){
int eMode;
static char * const azModeName[] = {"delete", "persist", "off"};
static char * const azModeName[] = {"delete", "persist", "off", "truncate"};
if( zRight==0 ){
eMode = PAGER_JOURNALMODE_QUERY;
}else{
int n = strlen(zRight);
eMode = 2;
eMode = sizeof(azModeName)/sizeof(azModeName[0]) - 1;
while( eMode>=0 && sqlite3StrNICmp(zRight, azModeName[eMode], n)!=0 ){
eMode--;
}
@@ -491,6 +491,7 @@ void sqlite3Pragma(
eMode = sqlite3PagerJournalMode(pPager, eMode);
}
assert( eMode==PAGER_JOURNALMODE_DELETE
|| eMode==PAGER_JOURNALMODE_TRUNCATE
|| eMode==PAGER_JOURNALMODE_PERSIST
|| eMode==PAGER_JOURNALMODE_OFF );
sqlite3VdbeSetNumCols(v, 1);