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Add the SQLITE_FCNTL_SIZE_HINT operator to sqlite3_file_control() and use it

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to give the VFS hints about the ultimate size of a database file when the
file is growing.

FossilOrigin-Name: 2b7e3b4a30d6a7c4a8a4b8e7dd2ed728b565c96d
This commit is contained in:
drh
2010-05-19 19:26:05 +00:00
parent 4c1cb6ab05
commit 9ff27ecdb2
5 changed files with 34 additions and 12 deletions
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8
src/pager.c
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@@ -3332,6 +3332,14 @@ static int pager_write_pagelist(PgHdr *pList){
rc = pagerOpentemp(pPager, pPager->fd, pPager->vfsFlags);
}
/* Before the first write, give the VFS a hint of what the final
** file size will be.
*/
if( pPager->dbSize > (pPager->dbOrigSize+1) && isOpen(pPager->fd) ){
sqlite3_int64 szFile = pPager->pageSize * (sqlite3_int64)pPager->dbSize;
sqlite3OsFileControl(pPager->fd, SQLITE_FCNTL_SIZE_HINT, &szFile);
}
while( rc==SQLITE_OK && pList ){
Pgno pgno = pList->pgno;