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Overview
| Comment: | Uses shifts rather than division for arithmetic on the cell indices, since those indices are always non-negative. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | btree-optimization |
| Files: | files | file ages | folders |
| SHA1: |
5bf2a3feeb2c83671bf3edeb20a54923 |
| User & Date: | drh 2013-11-25 17:38:26 |
Context
|
2013-11-25
| ||
| 20:14 | Return an SQLITE_CORRUPT error if the content size field of a table record extends off the end of a page. Closed-Leaf check-in: b48c4e40 user: drh tags: btree-optimization | |
| 17:38 | Uses shifts rather than division for arithmetic on the cell indices, since those indices are always non-negative. check-in: 5bf2a3fe user: drh tags: btree-optimization | |
| 16:52 | Optimize the skipping of the payload size field when doing a binary search for a rowid. check-in: 55e5bfa2 user: drh tags: btree-optimization | |
Changes
Changes to src/btree.c.
4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 .... 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 .... 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 |
** would have already detected db corruption. Similarly, pPage must
** be the right kind (index or table) of b-tree page. Otherwise
** a moveToChild() or moveToRoot() call would have detected corruption. */
assert( pPage->nCell>0 );
assert( pPage->intKey==(pIdxKey==0) );
lwr = 0;
upr = pPage->nCell-1;
idx = biasRight ? upr : upr/2;
pCur->aiIdx[pCur->iPage] = (u16)idx;
if( pPage->intKey ){
for(;;){
i64 nCellKey;
pCell = findCell(pPage, idx) + pPage->childPtrSize;
if( pPage->hasData ){
while( 0x80 <= *(pCell++) && pCell<pPage->aDataEnd ){}
................................................................................
}else{
assert( nCellKey==intKey );
pCur->validNKey = 1;
pCur->info.nKey = nCellKey;
pCur->aiIdx[pCur->iPage] = (u16)idx;
if( !pPage->leaf ){
lwr = idx;
c = 0;
break;
}else{
*pRes = 0;
rc = SQLITE_OK;
goto moveto_finish;
}
}
idx = (lwr+upr)/2;
}
}else{
for(;;){
int nCell;
pCell = findCell(pPage, idx) + pPage->childPtrSize;
/* The maximum supported page-size is 65536 bytes. This means that
................................................................................
}else{
assert( c==0 );
*pRes = 0;
rc = SQLITE_OK;
pCur->aiIdx[pCur->iPage] = (u16)idx;
goto moveto_finish;
}
if( lwr>upr ){
break;
}
idx = (lwr+upr)/2;
}
}
assert( lwr==upr+1 || (pPage->intKey && !pPage->leaf) );
assert( pPage->isInit );
if( pPage->leaf ){
assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
pCur->aiIdx[pCur->iPage] = (u16)idx;
*pRes = c;
rc = SQLITE_OK;
goto moveto_finish;
}else if( lwr>=pPage->nCell ){
chldPg = get4byte(&pPage->aData[pPage->hdrOffset+8]);
}else{
chldPg = get4byte(findCell(pPage, lwr));
}
pCur->aiIdx[pCur->iPage] = (u16)lwr;
rc = moveToChild(pCur, chldPg);
if( rc ) break;
|
> | | < > | | | < | > > | |
4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 .... 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 .... 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 |
** would have already detected db corruption. Similarly, pPage must
** be the right kind (index or table) of b-tree page. Otherwise
** a moveToChild() or moveToRoot() call would have detected corruption. */
assert( pPage->nCell>0 );
assert( pPage->intKey==(pIdxKey==0) );
lwr = 0;
upr = pPage->nCell-1;
assert( biasRight==0 || biasRight==1 );
idx = upr>>(1-biasRight); /* idx = biasRight ? upr : (lwr+upr)/2; */
pCur->aiIdx[pCur->iPage] = (u16)idx;
if( pPage->intKey ){
for(;;){
i64 nCellKey;
pCell = findCell(pPage, idx) + pPage->childPtrSize;
if( pPage->hasData ){
while( 0x80 <= *(pCell++) && pCell<pPage->aDataEnd ){}
................................................................................
}else{
assert( nCellKey==intKey );
pCur->validNKey = 1;
pCur->info.nKey = nCellKey;
pCur->aiIdx[pCur->iPage] = (u16)idx;
if( !pPage->leaf ){
lwr = idx;
goto moveto_next_layer;
}else{
*pRes = 0;
rc = SQLITE_OK;
goto moveto_finish;
}
}
assert( lwr+upr>=0 );
idx = (lwr+upr)>>1; /* idx = (lwr+upr)/2; */
}
}else{
for(;;){
int nCell;
pCell = findCell(pPage, idx) + pPage->childPtrSize;
/* The maximum supported page-size is 65536 bytes. This means that
................................................................................
}else{
assert( c==0 );
*pRes = 0;
rc = SQLITE_OK;
pCur->aiIdx[pCur->iPage] = (u16)idx;
goto moveto_finish;
}
if( lwr>upr ) break;
assert( lwr+upr>=0 );
idx = (lwr+upr)>>1; /* idx = (lwr+upr)/2 */
}
}
assert( lwr==upr+1 || (pPage->intKey && !pPage->leaf) );
assert( pPage->isInit );
if( pPage->leaf ){
assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
pCur->aiIdx[pCur->iPage] = (u16)idx;
*pRes = c;
rc = SQLITE_OK;
goto moveto_finish;
}
moveto_next_layer:
if( lwr>=pPage->nCell ){
chldPg = get4byte(&pPage->aData[pPage->hdrOffset+8]);
}else{
chldPg = get4byte(findCell(pPage, lwr));
}
pCur->aiIdx[pCur->iPage] = (u16)lwr;
rc = moveToChild(pCur, chldPg);
if( rc ) break;
|
Changes to src/vdbe.c.
4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 |
nZero = pData->u.nZero;
}else{
nZero = 0;
}
sqlite3BtreeSetCachedRowid(pC->pCursor, 0);
rc = sqlite3BtreeInsert(pC->pCursor, 0, iKey,
pData->z, pData->n, nZero,
pOp->p5 & OPFLAG_APPEND, seekResult
);
pC->rowidIsValid = 0;
pC->deferredMoveto = 0;
pC->cacheStatus = CACHE_STALE;
/* Invoke the update-hook if required. */
if( rc==SQLITE_OK && db->xUpdateCallback && pOp->p4.z ){
|
| |
4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 |
nZero = pData->u.nZero;
}else{
nZero = 0;
}
sqlite3BtreeSetCachedRowid(pC->pCursor, 0);
rc = sqlite3BtreeInsert(pC->pCursor, 0, iKey,
pData->z, pData->n, nZero,
(pOp->p5 & OPFLAG_APPEND)!=0, seekResult
);
pC->rowidIsValid = 0;
pC->deferredMoveto = 0;
pC->cacheStatus = CACHE_STALE;
/* Invoke the update-hook if required. */
if( rc==SQLITE_OK && db->xUpdateCallback && pOp->p4.z ){
|