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Overview
| Comment: | Remove unnecessary MemPage initialization resets in the autovacuum ptrmap processing. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
1b36fbb9f05f3a5844e198b489bff36e |
| User & Date: | drh 2016-12-12 18:12:03 |
Context
|
2016-12-12
| ||
| 23:24 | Add the --mmap option to the speedtest1 program and to the speed-check.sh script that is frequently used to run speedtest1. check-in: 1a636d5e user: drh tags: trunk | |
| 18:12 | Remove unnecessary MemPage initialization resets in the autovacuum ptrmap processing. check-in: 1b36fbb9 user: drh tags: trunk | |
| 16:08 | Faster operation for large in-memory databases. check-in: 9675518b user: drh tags: trunk | |
Changes
Changes to src/btree.c.
3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 .... 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 .... 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 .... 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 |
** map entries for the overflow pages as well.
*/
static int setChildPtrmaps(MemPage *pPage){
int i; /* Counter variable */
int nCell; /* Number of cells in page pPage */
int rc; /* Return code */
BtShared *pBt = pPage->pBt;
u8 isInitOrig = pPage->isInit;
Pgno pgno = pPage->pgno;
assert( sqlite3_mutex_held(pPage->pBt->mutex) );
rc = btreeInitPage(pPage);
if( rc!=SQLITE_OK ){
goto set_child_ptrmaps_out;
}
nCell = pPage->nCell;
for(i=0; i<nCell; i++){
u8 *pCell = findCell(pPage, i);
ptrmapPutOvflPtr(pPage, pCell, &rc);
................................................................................
}
if( !pPage->leaf ){
Pgno childPgno = get4byte(&pPage->aData[pPage->hdrOffset+8]);
ptrmapPut(pBt, childPgno, PTRMAP_BTREE, pgno, &rc);
}
set_child_ptrmaps_out:
pPage->isInit = isInitOrig;
return rc;
}
/*
** Somewhere on pPage is a pointer to page iFrom. Modify this pointer so
** that it points to iTo. Parameter eType describes the type of pointer to
** be modified, as follows:
................................................................................
if( eType==PTRMAP_OVERFLOW2 ){
/* The pointer is always the first 4 bytes of the page in this case. */
if( get4byte(pPage->aData)!=iFrom ){
return SQLITE_CORRUPT_BKPT;
}
put4byte(pPage->aData, iTo);
}else{
u8 isInitOrig = pPage->isInit;
int i;
int nCell;
int rc;
rc = btreeInitPage(pPage);
if( rc ) return rc;
nCell = pPage->nCell;
................................................................................
if( i==nCell ){
if( eType!=PTRMAP_BTREE ||
get4byte(&pPage->aData[pPage->hdrOffset+8])!=iFrom ){
return SQLITE_CORRUPT_BKPT;
}
put4byte(&pPage->aData[pPage->hdrOffset+8], iTo);
}
pPage->isInit = isInitOrig;
}
return SQLITE_OK;
}
/*
** Move the open database page pDbPage to location iFreePage in the
|
< | < < < < < < < |
3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 .... 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 .... 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 .... 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 |
** map entries for the overflow pages as well.
*/
static int setChildPtrmaps(MemPage *pPage){
int i; /* Counter variable */
int nCell; /* Number of cells in page pPage */
int rc; /* Return code */
BtShared *pBt = pPage->pBt;
Pgno pgno = pPage->pgno;
assert( sqlite3_mutex_held(pPage->pBt->mutex) );
rc = btreeInitPage(pPage);
if( rc!=SQLITE_OK ) return rc;
nCell = pPage->nCell;
for(i=0; i<nCell; i++){
u8 *pCell = findCell(pPage, i);
ptrmapPutOvflPtr(pPage, pCell, &rc);
................................................................................
}
if( !pPage->leaf ){
Pgno childPgno = get4byte(&pPage->aData[pPage->hdrOffset+8]);
ptrmapPut(pBt, childPgno, PTRMAP_BTREE, pgno, &rc);
}
return rc;
}
/*
** Somewhere on pPage is a pointer to page iFrom. Modify this pointer so
** that it points to iTo. Parameter eType describes the type of pointer to
** be modified, as follows:
................................................................................
if( eType==PTRMAP_OVERFLOW2 ){
/* The pointer is always the first 4 bytes of the page in this case. */
if( get4byte(pPage->aData)!=iFrom ){
return SQLITE_CORRUPT_BKPT;
}
put4byte(pPage->aData, iTo);
}else{
int i;
int nCell;
int rc;
rc = btreeInitPage(pPage);
if( rc ) return rc;
nCell = pPage->nCell;
................................................................................
if( i==nCell ){
if( eType!=PTRMAP_BTREE ||
get4byte(&pPage->aData[pPage->hdrOffset+8])!=iFrom ){
return SQLITE_CORRUPT_BKPT;
}
put4byte(&pPage->aData[pPage->hdrOffset+8], iTo);
}
}
return SQLITE_OK;
}
/*
** Move the open database page pDbPage to location iFreePage in the
|