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Overview
| Comment: | Optimization: Try to avoid unnecessary btree searching when repositioning a cursor to the next row. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
ee793d30c1dc1f78f49e6230d17750ec |
| User & Date: | drh 2017-01-23 16:56:18 |
Context
|
2017-01-23
| ||
| 18:40 | Add the --mmap option to the kvtest utility program. check-in: 4948f7e6 user: drh tags: trunk | |
| 16:56 | Optimization: Try to avoid unnecessary btree searching when repositioning a cursor to the next row. check-in: ee793d30 user: drh tags: trunk | |
| 15:58 | Add the missing SQLITE_API symbol to test_delete.c (it is not added automatically as this file is not part of the amalgamation). check-in: 7a4f512d user: dan tags: trunk | |
|
2017-01-21
| ||
| 21:47 | A better implementation of the moveto-neighbor optimization that checks for nearby rows on adjacent pages. Closed-Leaf check-in: 2c4ecb85 user: drh tags: btree-moveto-neighbor | |
Changes
Changes to src/btree.c.
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if( pIdxKey==0
&& pCur->eState==CURSOR_VALID && (pCur->curFlags & BTCF_ValidNKey)!=0
){
if( pCur->info.nKey==intKey ){
*pRes = 0;
return SQLITE_OK;
}
if( (pCur->curFlags & BTCF_AtLast)!=0 && pCur->info.nKey<intKey ){
*pRes = -1;
return SQLITE_OK;
}
}
if( pIdxKey ){
xRecordCompare = sqlite3VdbeFindCompare(pIdxKey);
pIdxKey->errCode = 0;
assert( pIdxKey->default_rc==1
|
> | | | > > > > > > > > > > > > > > > > |
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if( pIdxKey==0
&& pCur->eState==CURSOR_VALID && (pCur->curFlags & BTCF_ValidNKey)!=0
){
if( pCur->info.nKey==intKey ){
*pRes = 0;
return SQLITE_OK;
}
if( pCur->info.nKey<intKey ){
if( (pCur->curFlags & BTCF_AtLast)!=0 ){
*pRes = -1;
return SQLITE_OK;
}
/* If the requested key is one more than the previous key, then
** try to get there using sqlite3BtreeNext() rather than a full
** binary search. This is an optimization only. The correct answer
** is still obtained without this ase, only a little more slowely */
if( pCur->info.nKey+1==intKey && !pCur->skipNext ){
*pRes = 0;
rc = sqlite3BtreeNext(pCur, pRes);
if( rc ) return rc;
if( *pRes==0 ){
getCellInfo(pCur);
if( pCur->info.nKey==intKey ){
return SQLITE_OK;
}
}
}
}
}
if( pIdxKey ){
xRecordCompare = sqlite3VdbeFindCompare(pIdxKey);
pIdxKey->errCode = 0;
assert( pIdxKey->default_rc==1
|