database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-07 02:42:48 +03:00
Code Activity

When searching a list of freelist trunk pages looking for a specific page

Browse Source 
to allocate, avoid unnecessary journalling of the unchanged trunk pages towards
the start of the list.

FossilOrigin-Name: d03d63d77ed144ac2c02a0245c4b4b070b79c88e
This commit is contained in:
drh
2011-04-07 14:47:01 +00:00
parent fe98f9b216
commit 93b4fc78cf
3 changed files with 12 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/btree.c
View File

@@ -4819,7 +4819,7 @@ static int allocateBtreePage(
goto end_allocate_page;
}
k = get4byte(&pTrunk->aData[4]);
k = get4byte(&pTrunk->aData[4]); /* # of leaves on this trunk page */
if( k==0 && !searchList ){
/* The trunk has no leaves and the list is not being searched.
** So extract the trunk page itself and use it as the newly
@@ -4904,10 +4904,6 @@ static int allocateBtreePage(
u32 closest;
Pgno iPage;
unsigned char *aData = pTrunk->aData;
rc = sqlite3PagerWrite(pTrunk->pDbPage);
if( rc ){
goto end_allocate_page;
}
if( nearby>0 ){
u32 i;
int dist;
@@ -4937,11 +4933,12 @@ static int allocateBtreePage(
TRACE(("ALLOCATE: %d was leaf %d of %d on trunk %d"
": %d more free pages\n",
*pPgno, closest+1, k, pTrunk->pgno, n-1));
rc = sqlite3PagerWrite(pTrunk->pDbPage);
if( rc ) goto end_allocate_page;
if( closest<k-1 ){
memcpy(&aData[8+closest*4], &aData[4+k*4], 4);
}
put4byte(&aData[4], k-1);
assert( sqlite3PagerIswriteable(pTrunk->pDbPage) );
noContent = !btreeGetHasContent(pBt, *pPgno);
rc = btreeGetPage(pBt, *pPgno, ppPage, noContent);
if( rc==SQLITE_OK ){
@@ -5010,6 +5007,7 @@ end_allocate_page:
}else{
*ppPage = 0;
}
assert( rc!=SQLITE_OK || sqlite3PagerIswriteable((*ppPage)->pDbPage) );
return rc;
}