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When reusing pages as part of creating a new index, allocate the leaves from each free-list trunk page in ascending order, instead of trying to maximize localization for each individual allocation. This increases the chance that pages will be written to disk in ascending order by a large CREATE INDEX statement, improving overall performance.

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FossilOrigin-Name: d045f8b2d44e388d8c4549ff02d4ca7eff4e2038
This commit is contained in:
dan
2012-08-06 18:50:11 +00:00
parent 8c5287ec73
commit 428c218c90
11 changed files with 125 additions and 25 deletions
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17
src/btree.c
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@@ -5926,7 +5926,8 @@ static int balance_nonroot(
MemPage *pParent, /* Parent page of siblings being balanced */
int iParentIdx, /* Index of "the page" in pParent */
u8 *aOvflSpace, /* page-size bytes of space for parent ovfl */
int isRoot /* True if pParent is a root-page */
int isRoot, /* True if pParent is a root-page */
int bBulk /* True if this call is part of a bulk load */
){
BtShared *pBt; /* The whole database */
int nCell = 0; /* Number of cells in apCell[] */
@@ -6257,7 +6258,7 @@ static int balance_nonroot(
if( rc ) goto balance_cleanup;
}else{
assert( i>0 );
rc = allocateBtreePage(pBt, &pNew, &pgno, pgno, 0);
rc = allocateBtreePage(pBt, &pNew, &pgno, (bBulk ? 1 : pgno), 0);
if( rc ) goto balance_cleanup;
apNew[i] = pNew;
nNew++;
@@ -6707,7 +6708,7 @@ static int balance(BtCursor *pCur){
** pSpace buffer passed to the latter call to balance_nonroot().
*/
u8 *pSpace = sqlite3PageMalloc(pCur->pBt->pageSize);
rc = balance_nonroot(pParent, iIdx, pSpace, iPage==1);
rc = balance_nonroot(pParent, iIdx, pSpace, iPage==1, pCur->hints);
if( pFree ){
/* If pFree is not NULL, it points to the pSpace buffer used
** by a previous call to balance_nonroot(). Its contents are
@@ -8294,3 +8295,13 @@ int sqlite3BtreeSetVersion(Btree *pBtree, int iVersion){
pBt->btsFlags &= ~BTS_NO_WAL;
return rc;
}
/*
** set the mask of hint flags for cursor pCsr. Currently the only valid
** values are 0 and BTREE_BULKLOAD.
*/
void sqlite3BtreeCursorHints(BtCursor *pCsr, unsigned int mask){
assert( mask==BTREE_BULKLOAD || mask==0 );
pCsr->hints = mask;
}