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Overview
| Comment: | Minor performance tweaks to the pager. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
9ae1f9ce7ea6beaeddc3711080b3796e |
| User & Date: | drh 2013-08-21 22:54:55 |
Context
|
2013-08-21
| ||
| 23:42 | Simplify the btreeGetPage() routine so that it uses a single flag parameter in place of two boolean parameters. check-in: 617e23ec user: drh tags: trunk | |
| 22:54 | Minor performance tweaks to the pager. check-in: 9ae1f9ce user: drh tags: trunk | |
| 22:09 | Refactor the sqlite3_randomness() implementation for improved performance. check-in: 4144dffb user: drh tags: trunk | |
Changes
Changes to src/pager.c.
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** or more open savepoints for which:
**
** * The page-number is less than or equal to PagerSavepoint.nOrig, and
** * The bit corresponding to the page-number is not set in
** PagerSavepoint.pInSavepoint.
*/
static int subjRequiresPage(PgHdr *pPg){
Pgno pgno = pPg->pgno;
Pager *pPager = pPg->pPager;
int i;
for(i=0; i<pPager->nSavepoint; i++){
PagerSavepoint *p = &pPager->aSavepoint[i];
if( p->nOrig>=pgno && 0==sqlite3BitvecTest(p->pInSavepoint, pgno) ){
return 1;
}
}
return 0;
}
/*
** Return true if the page is already in the journal file.
................................................................................
Pgno pgno = pPg->pgno; /* Page number to read */
int rc = SQLITE_OK; /* Return code */
int pgsz = pPager->pageSize; /* Number of bytes to read */
assert( pPager->eState>=PAGER_READER && !MEMDB );
assert( isOpen(pPager->fd) );
if( NEVER(!isOpen(pPager->fd)) ){
assert( pPager->tempFile );
memset(pPg->pData, 0, pPager->pageSize);
return SQLITE_OK;
}
#ifndef SQLITE_OMIT_WAL
if( iFrame ){
/* Try to pull the page from the write-ahead log. */
rc = sqlite3WalReadFrame(pPager->pWal, iFrame, pgsz, pPg->pData);
}else
#endif
{
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** or more open savepoints for which:
**
** * The page-number is less than or equal to PagerSavepoint.nOrig, and
** * The bit corresponding to the page-number is not set in
** PagerSavepoint.pInSavepoint.
*/
static int subjRequiresPage(PgHdr *pPg){
Pager *pPager = pPg->pPager;
PagerSavepoint *p;
Pgno pgno;
int i;
if( pPager->nSavepoint ){
pgno = pPg->pgno;
for(i=0; i<pPager->nSavepoint; i++){
p = &pPager->aSavepoint[i];
if( p->nOrig>=pgno && 0==sqlite3BitvecTest(p->pInSavepoint, pgno) ){
return 1;
}
}
}
return 0;
}
/*
** Return true if the page is already in the journal file.
................................................................................
Pgno pgno = pPg->pgno; /* Page number to read */
int rc = SQLITE_OK; /* Return code */
int pgsz = pPager->pageSize; /* Number of bytes to read */
assert( pPager->eState>=PAGER_READER && !MEMDB );
assert( isOpen(pPager->fd) );
#ifndef SQLITE_OMIT_WAL
if( iFrame ){
/* Try to pull the page from the write-ahead log. */
rc = sqlite3WalReadFrame(pPager->pWal, iFrame, pgsz, pPg->pData);
}else
#endif
{
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