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Overview
| Comment: | For an existing multiplexed database, try to set the chunk size automatically based on the sizes of the preexisting pieces. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
427a9a5120a68bfa12fec97cfd02eb9b |
| User & Date: | drh 2011-07-20 17:59:38.568 |
Context
|
2011-07-21
| ||
| 20:59 | All multiplexor chunk sizes up to 4GiB. Disable the multiplexor if the chunk size is set to 0. (check-in: 83191ad6f3 user: drh tags: trunk) | |
|
2011-07-20
| ||
| 17:59 | For an existing multiplexed database, try to set the chunk size automatically based on the sizes of the preexisting pieces. (check-in: 427a9a5120 user: drh tags: trunk) | |
| 17:13 | All the SQLITE_OPEN_URI flag to propagate down into the VFS. (check-in: 29866f9598 user: drh tags: trunk) | |
Changes
Changes to src/test_multiplex.c.
| ︙ | ︙ | |||
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sqlite3_file *pConn, /* Fill in this file descriptor */
int flags, /* Flags to control the opening */
int *pOutFlags /* Flags showing results of opening */
){
int rc = SQLITE_OK; /* Result code */
multiplexConn *pMultiplexOpen; /* The new multiplex file descriptor */
multiplexGroup *pGroup; /* Corresponding multiplexGroup object */
| | | 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 |
sqlite3_file *pConn, /* Fill in this file descriptor */
int flags, /* Flags to control the opening */
int *pOutFlags /* Flags showing results of opening */
){
int rc = SQLITE_OK; /* Result code */
multiplexConn *pMultiplexOpen; /* The new multiplex file descriptor */
multiplexGroup *pGroup; /* Corresponding multiplexGroup object */
sqlite3_file *pSubOpen = 0; /* Real file descriptor */
sqlite3_vfs *pOrigVfs = gMultiplex.pOrigVfs; /* Real VFS */
int nName;
int sz;
char *zToFree = 0;
UNUSED_PARAMETER(pVfs);
memset(pConn, 0, pVfs->szOsFile);
|
| ︙ | ︙ | |||
509 510 511 512 513 514 515 |
}
}
pGroup->zName = p;
/* save off base filename, name length, and original open flags */
memcpy(pGroup->zName, zName, nName+1);
pGroup->nName = nName;
pGroup->flags = flags;
| > > | > < < < > > | > > > > > > > > > > > > > > | > | | > > | 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 |
}
}
pGroup->zName = p;
/* save off base filename, name length, and original open flags */
memcpy(pGroup->zName, zName, nName+1);
pGroup->nName = nName;
pGroup->flags = flags;
rc = multiplexSubFilename(pGroup, 1);
if( rc==SQLITE_OK ){
pSubOpen = multiplexSubOpen(pGroup, 0, &rc, pOutFlags);
}
if( pSubOpen ){
int exists, rc2, rc3;
sqlite3_int64 sz;
rc2 = pSubOpen->pMethods->xFileSize(pSubOpen, &sz);
if( rc2==SQLITE_OK ){
/* If the first overflow file exists and if the size of the main file
** is different from the chunk size, that means the chunk size is set
** set incorrectly. So fix it.
**
** Or, if the first overflow file does not exist and the main file is
** larger than the chunk size, that means the chunk size is too small.
** But we have no way of determining the intended chunk size, so
** just disable the multiplexor all togethre.
*/
rc3 = pOrigVfs->xAccess(pOrigVfs, pGroup->aReal[1].z,
SQLITE_ACCESS_EXISTS, &exists);
if( rc3==SQLITE_OK && exists && sz==(sz&0xffff0000) && sz>0
&& sz!=pGroup->nChunkSize ){
pGroup->nChunkSize = sz;
}else if( rc3==SQLITE_OK && !exists && sz>pGroup->nChunkSize ){
pGroup->bEnabled = 0;
}
}
if( pSubOpen->pMethods->iVersion==1 ){
pMultiplexOpen->base.pMethods = &gMultiplex.sIoMethodsV1;
}else{
pMultiplexOpen->base.pMethods = &gMultiplex.sIoMethodsV2;
}
/* place this group at the head of our list */
pGroup->pNext = gMultiplex.pGroups;
|
| ︙ | ︙ | |||
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sqlite3_file *pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL);
if( pSubOpen==0 ){
rc = SQLITE_IOERR_FSTAT;
}else{
rc = pSubOpen->pMethods->xFileSize(pSubOpen, pSize);
}
}else{
*pSize = 0;
for(i=0; 1; i++){
sqlite3_file *pSubOpen = 0;
| > < | 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 |
sqlite3_file *pSubOpen = multiplexSubOpen(pGroup, 0, &rc, NULL);
if( pSubOpen==0 ){
rc = SQLITE_IOERR_FSTAT;
}else{
rc = pSubOpen->pMethods->xFileSize(pSubOpen, pSize);
}
}else{
sqlite3_vfs *pOrigVfs = gMultiplex.pOrigVfs;
*pSize = 0;
for(i=0; 1; i++){
sqlite3_file *pSubOpen = 0;
int exists = 0;
rc = multiplexSubFilename(pGroup, i);
if( rc ) break;
rc2 = pOrigVfs->xAccess(pOrigVfs, pGroup->aReal[i].z,
SQLITE_ACCESS_EXISTS, &exists);
if( rc2==SQLITE_OK && exists){
/* if it exists, open it */
|
| ︙ | ︙ |