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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 | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 427a9a5120a68bfa12fec97cfd02eb9b |
| User & Date: | drh 2011-07-20 17:59:38 |
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: 83191ad6 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: 427a9a51 user: drh tags: trunk | |
| 17:13 | All the SQLITE_OPEN_URI flag to propagate down into the VFS. check-in: 29866f95 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 */
sqlite3_file *pSubOpen; /* 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);
................................................................................
}
}
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;
pSubOpen = multiplexSubOpen(pGroup, 0, &rc, pOutFlags);
if( pSubOpen ){
/* if this file is already larger than chunk size, disable
** the multiplex feature.
*/
sqlite3_int64 sz;
int rc2 = pSubOpen->pMethods->xFileSize(pSubOpen, &sz);
if( (rc2==SQLITE_OK) && (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;
................................................................................
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;
sqlite3_vfs *pOrigVfs = gMultiplex.pOrigVfs;
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 */
|
| > > | > < < < > > | > > > > > > > > > > > > > > | > | | > > > < |
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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 */
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);
................................................................................
}
}
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;
................................................................................
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 */
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