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Overview
| Comment: | Merge two leaves on the WAL branch. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | wal |
| Files: | files | file ages | folders |
| SHA1: |
c9ed66cc3994b3b0d67a6c950b552a1a |
| User & Date: | dan 2010-04-15 13:33:18.000 |
Context
|
2010-04-15
| ||
| 16:45 | Allow writers to write dirty pages to the log mid-transaction in order to free memory. (check-in: ecd828f969 user: dan tags: wal) | |
| 13:33 | Merge two leaves on the WAL branch. (check-in: c9ed66cc39 user: dan tags: wal) | |
| 12:36 | Fix a problem in the result set size estimation logic of the query planner - a problem introduced by the two previous changes. (check-in: 33b1f584ef user: drh tags: wal) | |
| 10:58 | Change the way checksums are calculated. (check-in: 84955c2e9c user: dan tags: wal) | |
Changes
Changes to src/log.c.
| ︙ | ︙ | |||
801 802 803 804 805 806 807 808 809 810 811 812 813 814 |
u8 *zBuf /* Temporary buffer to use */
){
int rc; /* Return code */
int pgsz = pLog->hdr.pgsz; /* Database page-size */
LogCheckpoint *pIter = 0; /* Log iterator context */
u32 iDbpage = 0; /* Next database page to write */
u32 iFrame = 0; /* Log frame containing data for iDbpage */
/* Allocate the iterator */
pIter = logCheckpointInit(pLog);
if( !pIter ) return SQLITE_NOMEM;
/* Sync the log file to disk */
rc = sqlite3OsSync(pLog->pFd, pLog->sync_flags);
| > > > > | 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 |
u8 *zBuf /* Temporary buffer to use */
){
int rc; /* Return code */
int pgsz = pLog->hdr.pgsz; /* Database page-size */
LogCheckpoint *pIter = 0; /* Log iterator context */
u32 iDbpage = 0; /* Next database page to write */
u32 iFrame = 0; /* Log frame containing data for iDbpage */
if( pLog->hdr.iLastPg==0 ){
return SQLITE_OK;
}
/* Allocate the iterator */
pIter = logCheckpointInit(pLog);
if( !pIter ) return SQLITE_NOMEM;
/* Sync the log file to disk */
rc = sqlite3OsSync(pLog->pFd, pLog->sync_flags);
|
| ︙ | ︙ |
Changes to src/where.c.
| ︙ | ︙ | |||
2733 2734 2735 2736 2737 2738 2739 2740 |
/* If there are additional constraints on this table that cannot
** be used with the current index, but which might lower the number
** of output rows, adjust the nRow value accordingly. This only
** matters if the current index is the least costly, so do not bother
** with this step if we already know this index will not be chosen.
** Also, never reduce the output row count below 2 using this step.
*/
| > > > > > > > > > | | | | > > | | 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 |
/* If there are additional constraints on this table that cannot
** be used with the current index, but which might lower the number
** of output rows, adjust the nRow value accordingly. This only
** matters if the current index is the least costly, so do not bother
** with this step if we already know this index will not be chosen.
** Also, never reduce the output row count below 2 using this step.
**
** Do not reduce the output row count if pSrc is the only table that
** is notReady; if notReady is a power of two. This will be the case
** when the main sqlite3WhereBegin() loop is scanning for a table with
** and "optimal" index, and on such a scan the output row count
** reduction is not valid because it does not update the "pCost->used"
** bitmap. The notReady bitmap will also be a power of two when we
** are scanning for the last table in a 64-way join. We are willing
** to bypass this optimization in that corner case.
*/
if( nRow>2 && cost<=pCost->rCost && (notReady & (notReady-1))!=0 ){
int k; /* Loop counter */
int nSkipEq = nEq; /* Number of == constraints to skip */
int nSkipRange = nBound; /* Number of < constraints to skip */
Bitmask thisTab; /* Bitmap for pSrc */
thisTab = getMask(pWC->pMaskSet, iCur);
for(pTerm=pWC->a, k=pWC->nTerm; nRow>2 && k; k--, pTerm++){
if( pTerm->wtFlags & TERM_VIRTUAL ) continue;
if( (pTerm->prereqAll & notReady)!=thisTab ) continue;
if( pTerm->eOperator & (WO_EQ|WO_IN|WO_ISNULL) ){
if( nSkipEq ){
/* Ignore the first nEq equality matches since the index
** has already accounted for these */
|
| ︙ | ︙ |