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Overview
| Comment: | When using a temporary file for a statement journal, store the first 64KiB in memory. If the file grows larger than that, flush it to disk and free the memory. Hardcoding to 64KiB is just an experiment to check that the memjournal.c code works. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | memjournal-exp |
| Files: | files | file ages | folders |
| SHA1: |
44b2dc18e200e87cf062cb8f1659727c |
| User & Date: | dan 2016-02-29 20:18:21 |
Context
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2016-03-03
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| 21:29 | Merge the latest updates from trunk. check-in: 55c00f71 user: drh tags: memjournal-exp | |
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2016-02-29
| ||
| 20:18 | When using a temporary file for a statement journal, store the first 64KiB in memory. If the file grows larger than that, flush it to disk and free the memory. Hardcoding to 64KiB is just an experiment to check that the memjournal.c code works. check-in: 44b2dc18 user: dan tags: memjournal-exp | |
| 20:00 | Fix minor problems with new code in memjournal.c. check-in: 9fd3f7b9 user: dan tags: memjournal-exp | |
Changes
Changes to src/memjournal.c.
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 |
){
MemJournal *p = (MemJournal*)pJfd;
/* Zero the file-handle object. If nBuf was passed zero, initialize
** it using the sqlite3OsOpen() function of the underlying VFS. In this
** case none of the code in this module is executed as a result of calls
** made on the journal file-handle. */
memset(p, 0, sizeof(MemJournal) + pVfs ? pVfs->szOsFile : 0);
if( nBuf==0 ){
return sqlite3OsOpen(pVfs, zName, pJfd, flags, 0);
}
if( nBuf>0 ){
p->nChunkSize = nBuf;
}else{
|
| |
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 |
){
MemJournal *p = (MemJournal*)pJfd;
/* Zero the file-handle object. If nBuf was passed zero, initialize
** it using the sqlite3OsOpen() function of the underlying VFS. In this
** case none of the code in this module is executed as a result of calls
** made on the journal file-handle. */
memset(p, 0, sizeof(MemJournal) + (pVfs ? pVfs->szOsFile : 0));
if( nBuf==0 ){
return sqlite3OsOpen(pVfs, zName, pJfd, flags, 0);
}
if( nBuf>0 ){
p->nChunkSize = nBuf;
}else{
|
Changes to src/pager.c.
4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 |
** SQLITE_OK is returned if everything goes according to plan. An
** SQLITE_IOERR_XXX error code is returned if a call to sqlite3OsOpen()
** fails.
*/
static int openSubJournal(Pager *pPager){
int rc = SQLITE_OK;
if( !isOpen(pPager->sjfd) ){
if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY || pPager->subjInMemory ){
sqlite3MemJournalOpen(pPager->sjfd);
}else{
rc = pagerOpentemp(pPager, pPager->sjfd, SQLITE_OPEN_SUBJOURNAL);
}
}
return rc;
}
/*
** Append a record of the current state of page pPg to the sub-journal.
**
|
> > > > < < < > > |
4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 |
** SQLITE_OK is returned if everything goes according to plan. An
** SQLITE_IOERR_XXX error code is returned if a call to sqlite3OsOpen()
** fails.
*/
static int openSubJournal(Pager *pPager){
int rc = SQLITE_OK;
if( !isOpen(pPager->sjfd) ){
const int flags = SQLITE_OPEN_SUBJOURNAL | SQLITE_OPEN_READWRITE
| SQLITE_OPEN_CREATE | SQLITE_OPEN_EXCLUSIVE
| SQLITE_OPEN_DELETEONCLOSE;
int nBuf = 64*1024;
if( pPager->journalMode==PAGER_JOURNALMODE_MEMORY || pPager->subjInMemory ){
nBuf = -1;
}
rc = sqlite3JournalOpen(pPager->pVfs, 0, pPager->sjfd, flags, nBuf);
}
return rc;
}
/*
** Append a record of the current state of page pPg to the sub-journal.
**
|