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Overview
Comment: | Add the max_page_count pragma used to limit the maximum size of a database file. Untested. (CVS 3948) |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
b1b74f06688fd90fcaf54cf95e2e7bee |
User & Date: | drh 2007-05-08 14:51:37.000 |
Context
2007-05-08
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15:15 | Introduce the (experimental) sqlite3_result_error_toobig() API that function implementations can use to signal SQLite that the function result is too big to represent. (CVS 3949) (check-in: 17c4235c49 user: drh tags: trunk) | |
14:51 | Add the max_page_count pragma used to limit the maximum size of a database file. Untested. (CVS 3948) (check-in: b1b74f0668 user: drh tags: trunk) | |
14:39 | Fix a potential buffer overrun in the replace() function. (CVS 3947) (check-in: b0fb4a3cf6 user: danielk1977 tags: trunk) | |
Changes
Changes to src/btree.c.
1 2 3 4 5 6 7 8 9 10 11 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* | | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | /* ** 2004 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: btree.c,v 1.378 2007/05/08 14:51:37 drh Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** See the header comment on "btreeInt.h" for additional information. ** Including a description of file format and an overview of operation. */ #include "btreeInt.h" |
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1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 | */ int sqlite3BtreeGetPageSize(Btree *p){ return p->pBt->pageSize; } int sqlite3BtreeGetReserve(Btree *p){ return p->pBt->pageSize - p->pBt->usableSize; } #endif /* !defined(SQLITE_OMIT_PAGER_PRAGMAS) || !defined(SQLITE_OMIT_VACUUM) */ /* ** Change the 'auto-vacuum' property of the database. If the 'autoVacuum' ** parameter is non-zero, then auto-vacuum mode is enabled. If zero, it ** is disabled. The default value for the auto-vacuum property is ** determined by the SQLITE_DEFAULT_AUTOVACUUM macro. | > > > > > > > > > | 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 | */ int sqlite3BtreeGetPageSize(Btree *p){ return p->pBt->pageSize; } int sqlite3BtreeGetReserve(Btree *p){ return p->pBt->pageSize - p->pBt->usableSize; } /* ** Set the maximum page count for a database if mxPage is positive. ** No changes are made if mxPage is 0 or negative. ** Regardless of the value of mxPage, return the maximum page count. */ int sqlite3BtreeMaxPageCount(Btree *p, int mxPage){ return sqlite3PagerMaxPageCount(p->pBt->pPager, mxPage); } #endif /* !defined(SQLITE_OMIT_PAGER_PRAGMAS) || !defined(SQLITE_OMIT_VACUUM) */ /* ** Change the 'auto-vacuum' property of the database. If the 'autoVacuum' ** parameter is non-zero, then auto-vacuum mode is enabled. If zero, it ** is disabled. The default value for the auto-vacuum property is ** determined by the SQLITE_DEFAULT_AUTOVACUUM macro. |
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Changes to src/btree.h.
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9 10 11 12 13 14 15 | ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite B-Tree file ** subsystem. See comments in the source code for a detailed description ** of what each interface routine does. ** | | | 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite B-Tree file ** subsystem. See comments in the source code for a detailed description ** of what each interface routine does. ** ** @(#) $Id: btree.h,v 1.81 2007/05/08 14:51:37 drh Exp $ */ #ifndef _BTREE_H_ #define _BTREE_H_ /* TODO: This definition is just included so other modules compile. It ** needs to be revisited. */ |
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63 64 65 66 67 68 69 70 71 72 73 74 75 76 | int sqlite3BtreeClose(Btree*); int sqlite3BtreeSetBusyHandler(Btree*,BusyHandler*); int sqlite3BtreeSetCacheSize(Btree*,int); int sqlite3BtreeSetSafetyLevel(Btree*,int,int); int sqlite3BtreeSyncDisabled(Btree*); int sqlite3BtreeSetPageSize(Btree*,int,int); int sqlite3BtreeGetPageSize(Btree*); int sqlite3BtreeGetReserve(Btree*); int sqlite3BtreeSetAutoVacuum(Btree *, int); int sqlite3BtreeGetAutoVacuum(Btree *); int sqlite3BtreeBeginTrans(Btree*,int); int sqlite3BtreeCommitPhaseOne(Btree*, const char *zMaster); int sqlite3BtreeCommitPhaseTwo(Btree*); int sqlite3BtreeCommit(Btree*); | > | 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | int sqlite3BtreeClose(Btree*); int sqlite3BtreeSetBusyHandler(Btree*,BusyHandler*); int sqlite3BtreeSetCacheSize(Btree*,int); int sqlite3BtreeSetSafetyLevel(Btree*,int,int); int sqlite3BtreeSyncDisabled(Btree*); int sqlite3BtreeSetPageSize(Btree*,int,int); int sqlite3BtreeGetPageSize(Btree*); int sqlite3BtreeMaxPageCount(Btree*,int); int sqlite3BtreeGetReserve(Btree*); int sqlite3BtreeSetAutoVacuum(Btree *, int); int sqlite3BtreeGetAutoVacuum(Btree *); int sqlite3BtreeBeginTrans(Btree*,int); int sqlite3BtreeCommitPhaseOne(Btree*, const char *zMaster); int sqlite3BtreeCommitPhaseTwo(Btree*); int sqlite3BtreeCommit(Btree*); |
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Changes to src/limits.h.
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8 9 10 11 12 13 14 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file defines various limits of what SQLite can process. ** | | | 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file defines various limits of what SQLite can process. ** ** @(#) $Id: limits.h,v 1.3 2007/05/08 14:51:37 drh Exp $ */ /* ** The maximum length of a TEXT or BLOB in bytes. This also ** limits the size of a row in a table or index. ** ** The hard limit is the ability of a 32-bit signed integer |
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122 123 124 125 126 127 128 129 130 131 132 | */ #ifndef SQLITE_MAX_PAGE_SIZE # define SQLITE_MAX_PAGE_SIZE 32768 #endif /* ** Maximum number of pages in one database file. */ #ifndef SQLITE_MAX_PAGE_COUNT # define SQLITE_MAX_PAGE_COUNT 1073741823 #endif | > > > > | 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | */ #ifndef SQLITE_MAX_PAGE_SIZE # define SQLITE_MAX_PAGE_SIZE 32768 #endif /* ** Maximum number of pages in one database file. ** ** This is really just the default value for the max_page_count pragma. ** This value can be lowered (or raised) at run-time using that the ** max_page_count macro. */ #ifndef SQLITE_MAX_PAGE_COUNT # define SQLITE_MAX_PAGE_COUNT 1073741823 #endif |
Changes to src/pager.c.
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14 15 16 17 18 19 20 | ** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** | | | 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | ** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** ** @(#) $Id: pager.c,v 1.337 2007/05/08 14:51:37 drh Exp $ */ #ifndef SQLITE_OMIT_DISKIO #include "sqliteInt.h" #include "os.h" #include "pager.h" #include <assert.h> #include <string.h> |
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252 253 254 255 256 257 258 | int stmtSize; /* Size of database (in pages) at stmt_begin() */ int nRec; /* Number of pages written to the journal */ u32 cksumInit; /* Quasi-random value added to every checksum */ int stmtNRec; /* Number of records in stmt subjournal */ int nExtra; /* Add this many bytes to each in-memory page */ int pageSize; /* Number of bytes in a page */ int nPage; /* Total number of in-memory pages */ | < > | 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 | int stmtSize; /* Size of database (in pages) at stmt_begin() */ int nRec; /* Number of pages written to the journal */ u32 cksumInit; /* Quasi-random value added to every checksum */ int stmtNRec; /* Number of records in stmt subjournal */ int nExtra; /* Add this many bytes to each in-memory page */ int pageSize; /* Number of bytes in a page */ int nPage; /* Total number of in-memory pages */ int nRef; /* Number of in-memory pages with PgHdr.nRef>0 */ int mxPage; /* Maximum number of pages to hold in cache */ Pgno mxPgno; /* Maximum allowed size of the database */ u8 *aInJournal; /* One bit for each page in the database file */ u8 *aInStmt; /* One bit for each page in the database */ char *zFilename; /* Name of the database file */ char *zJournal; /* Name of the journal file */ char *zDirectory; /* Directory hold database and journal files */ OsFile *fd, *jfd; /* File descriptors for database and journal */ OsFile *stfd; /* File descriptor for the statement subjournal*/ |
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1747 1748 1749 1750 1751 1752 1753 | /* pPager->stmtInUse = 0; */ /* pPager->nRef = 0; */ pPager->dbSize = memDb-1; pPager->pageSize = SQLITE_DEFAULT_PAGE_SIZE; /* pPager->stmtSize = 0; */ /* pPager->stmtJSize = 0; */ /* pPager->nPage = 0; */ | < > | 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 | /* pPager->stmtInUse = 0; */ /* pPager->nRef = 0; */ pPager->dbSize = memDb-1; pPager->pageSize = SQLITE_DEFAULT_PAGE_SIZE; /* pPager->stmtSize = 0; */ /* pPager->stmtJSize = 0; */ /* pPager->nPage = 0; */ pPager->mxPage = 100; pPager->mxPgno = SQLITE_MAX_PAGE_COUNT; assert( PAGER_UNLOCK==0 ); /* pPager->state = PAGER_UNLOCK; */ /* pPager->errMask = 0; */ pPager->tempFile = tempFile; assert( tempFile==PAGER_LOCKINGMODE_NORMAL || tempFile==PAGER_LOCKINGMODE_EXCLUSIVE ); assert( PAGER_LOCKINGMODE_EXCLUSIVE==1 ); |
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1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 | if( !pPager->memDb && pPager->nRef==0 ){ pager_reset(pPager); pPager->pageSize = pageSize; pPager->pTmpSpace = sqlite3ReallocOrFree(pPager->pTmpSpace, pageSize); } return pPager->pageSize; } /* ** The following set of routines are used to disable the simulated ** I/O error mechanism. These routines are used to avoid simulated ** errors in places where we do not care about errors. ** ** Unless -DSQLITE_TEST=1 is used, these routines are all no-ops | > > > > > > > > > > > > > > > | 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 | if( !pPager->memDb && pPager->nRef==0 ){ pager_reset(pPager); pPager->pageSize = pageSize; pPager->pTmpSpace = sqlite3ReallocOrFree(pPager->pTmpSpace, pageSize); } return pPager->pageSize; } /* ** Attempt to set the maximum database page count if mxPage is positive. ** Make no changes if mxPage is zero or negative. And never reduce the ** maximum page count below the current size of the database. ** ** Regardless of mxPage, return the current maximum page count. */ int sqlite3PagerMaxPageCount(Pager *pPager, int mxPage){ if( mxPage>0 ){ pPager->mxPgno = mxPage; } sqlite3PagerPagecount(pPager); return pPager->mxPgno; } /* ** The following set of routines are used to disable the simulated ** I/O error mechanism. These routines are used to avoid simulated ** errors in places where we do not care about errors. ** ** Unless -DSQLITE_TEST=1 is used, these routines are all no-ops |
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1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 | } if( pPager->state!=PAGER_UNLOCK ){ pPager->dbSize = n; } } if( n==(PENDING_BYTE/pPager->pageSize) ){ n++; } return n; } #ifndef SQLITE_OMIT_MEMORYDB /* | > > > | 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 | } if( pPager->state!=PAGER_UNLOCK ){ pPager->dbSize = n; } } if( n==(PENDING_BYTE/pPager->pageSize) ){ n++; } if( n>pPager->mxPgno ){ pPager->mxPgno = n; } return n; } #ifndef SQLITE_OMIT_MEMORYDB /* |
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2908 2909 2910 2911 2912 2913 2914 | if( MEMDB ){ memset(PGHDR_TO_HIST(pPg, pPager), 0, sizeof(PgHistory)); } pPg->pPager = pPager; pPg->pNextAll = pPager->pAll; pPager->pAll = pPg; pPager->nPage++; | < < < < | 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 | if( MEMDB ){ memset(PGHDR_TO_HIST(pPg, pPager), 0, sizeof(PgHistory)); } pPg->pPager = pPager; pPg->pNextAll = pPager->pAll; pPager->pAll = pPg; pPager->nPage++; }else{ /* Recycle an existing page with a zero ref-count. */ rc = pager_recycle(pPager, 1, &pPg); if( rc!=SQLITE_OK ){ goto pager_allocate_out; } assert( pPager->state>=SHARED_LOCK ); |
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3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 | return rc; } /* Populate the page with data, either by reading from the database ** file, or by setting the entire page to zero. */ if( nMax<(int)pgno || MEMDB || (noContent && !pPager->alwaysRollback) ){ memset(PGHDR_TO_DATA(pPg), 0, pPager->pageSize); pPg->needRead = noContent && !pPager->alwaysRollback; IOTRACE(("ZERO %p %d\n", pPager, pgno)); }else{ rc = readDbPage(pPager, pPg, pgno); if( rc!=SQLITE_OK && rc!=SQLITE_IOERR_SHORT_READ ){ pPg->pgno = 0; | > > > | 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 | return rc; } /* Populate the page with data, either by reading from the database ** file, or by setting the entire page to zero. */ if( nMax<(int)pgno || MEMDB || (noContent && !pPager->alwaysRollback) ){ if( pgno>pPager->mxPgno ){ return SQLITE_FULL; } memset(PGHDR_TO_DATA(pPg), 0, pPager->pageSize); pPg->needRead = noContent && !pPager->alwaysRollback; IOTRACE(("ZERO %p %d\n", pPager, pgno)); }else{ rc = readDbPage(pPager, pPg, pgno); if( rc!=SQLITE_OK && rc!=SQLITE_IOERR_SHORT_READ ){ pPg->pgno = 0; |
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Changes to src/pager.h.
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9 10 11 12 13 14 15 | ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite page cache ** subsystem. The page cache subsystem reads and writes a file a page ** at a time and provides a journal for rollback. ** | | | 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | ** May you share freely, never taking more than you give. ** ************************************************************************* ** This header file defines the interface that the sqlite page cache ** subsystem. The page cache subsystem reads and writes a file a page ** at a time and provides a journal for rollback. ** ** @(#) $Id: pager.h,v 1.60 2007/05/08 14:51:37 drh Exp $ */ #ifndef _PAGER_H_ #define _PAGER_H_ /* ** The type used to represent a page number. The first page in a file |
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56 57 58 59 60 61 62 63 64 65 66 67 68 69 | */ int sqlite3PagerOpen(Pager **ppPager, const char *zFilename, int nExtra, int flags); void sqlite3PagerSetBusyhandler(Pager*, BusyHandler *pBusyHandler); void sqlite3PagerSetDestructor(Pager*, void(*)(DbPage*,int)); void sqlite3PagerSetReiniter(Pager*, void(*)(DbPage*,int)); int sqlite3PagerSetPagesize(Pager*, int); int sqlite3PagerReadFileheader(Pager*, int, unsigned char*); void sqlite3PagerSetCachesize(Pager*, int); int sqlite3PagerClose(Pager *pPager); int sqlite3PagerAcquire(Pager *pPager, Pgno pgno, DbPage **ppPage, int clrFlag); #define sqlite3PagerGet(A,B,C) sqlite3PagerAcquire(A,B,C,0) DbPage *sqlite3PagerLookup(Pager *pPager, Pgno pgno); int sqlite3PagerRef(DbPage*); | > | 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | */ int sqlite3PagerOpen(Pager **ppPager, const char *zFilename, int nExtra, int flags); void sqlite3PagerSetBusyhandler(Pager*, BusyHandler *pBusyHandler); void sqlite3PagerSetDestructor(Pager*, void(*)(DbPage*,int)); void sqlite3PagerSetReiniter(Pager*, void(*)(DbPage*,int)); int sqlite3PagerSetPagesize(Pager*, int); int sqlite3PagerMaxPageCount(Pager*, int); int sqlite3PagerReadFileheader(Pager*, int, unsigned char*); void sqlite3PagerSetCachesize(Pager*, int); int sqlite3PagerClose(Pager *pPager); int sqlite3PagerAcquire(Pager *pPager, Pgno pgno, DbPage **ppPage, int clrFlag); #define sqlite3PagerGet(A,B,C) sqlite3PagerAcquire(A,B,C,0) DbPage *sqlite3PagerLookup(Pager *pPager, Pgno pgno); int sqlite3PagerRef(DbPage*); |
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Changes to src/pragma.c.
1 2 3 4 5 6 7 8 9 10 11 12 13 | /* ** 2003 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains code used to implement the PRAGMA command. ** | | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /* ** 2003 April 6 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains code used to implement the PRAGMA command. ** ** $Id: pragma.c,v 1.136 2007/05/08 14:51:37 drh Exp $ */ #include "sqliteInt.h" #include "os.h" #include <ctype.h> /* Ignore this whole file if pragmas are disabled */ |
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340 341 342 343 344 345 346 347 348 349 350 351 352 353 | int size = pBt ? sqlite3BtreeGetPageSize(pBt) : 0; returnSingleInt(pParse, "page_size", size); }else{ sqlite3BtreeSetPageSize(pBt, atoi(zRight), -1); } }else /* ** PRAGMA [database.]locking_mode ** PRAGMA [database.]locking_mode = (normal|exclusive) */ if( sqlite3StrICmp(zLeft,"locking_mode")==0 ){ const char *zRet = "normal"; int eMode = getLockingMode(zRight); | > > > > > > > > > > > > > > > > > > > > > | 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 | int size = pBt ? sqlite3BtreeGetPageSize(pBt) : 0; returnSingleInt(pParse, "page_size", size); }else{ sqlite3BtreeSetPageSize(pBt, atoi(zRight), -1); } }else /* ** PRAGMA [database.]max_page_count ** PRAGMA [database.]max_page_count=N ** ** The first form reports the current setting for the ** maximum number of pages in the database file. The ** second form attempts to change this setting. Both ** forms return the current setting. */ if( sqlite3StrICmp(zLeft,"max_page_count")==0 ){ Btree *pBt = pDb->pBt; int newMax = 0; if( zRight ){ newMax = atoi(zRight); } if( pBt ){ newMax = sqlite3BtreeMaxPageCount(pBt, newMax); } returnSingleInt(pParse, "max_page_count", newMax); }else /* ** PRAGMA [database.]locking_mode ** PRAGMA [database.]locking_mode = (normal|exclusive) */ if( sqlite3StrICmp(zLeft,"locking_mode")==0 ){ const char *zRet = "normal"; int eMode = getLockingMode(zRight); |
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Changes to www/pragma.tcl.
1 2 3 | # # Run this Tcl script to generate the pragma.html file. # | | | 1 2 3 4 5 6 7 8 9 10 11 | # # Run this Tcl script to generate the pragma.html file. # set rcsid {$Id: pragma.tcl,v 1.24 2007/05/08 14:51:37 drh Exp $} source common.tcl header {Pragma statements supported by SQLite} proc Section {name {label {}}} { puts "\n<hr />" if {$label!=""} { puts "<a name=\"$label\"></a>" |
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334 335 336 337 338 339 340 341 342 343 344 345 346 347 | may only be set if the database has not yet been created. The page size must be a power of two greater than or equal to 512 and less than or equal to 8192. The upper limit may be modified by setting the value of macro SQLITE_MAX_PAGE_SIZE during compilation. The maximum upper bound is 32768. </p> </li> <a name="pragma_read_uncommitted"></a> <li><p><b>PRAGMA read_uncommitted; <br>PRAGMA read_uncommitted = </b><i>0 | 1</i><b>;</b></p> <p>Query, set, or clear READ UNCOMMITTED isolation. The default isolation level for SQLite is SERIALIZABLE. Any process or thread can select READ UNCOMMITTED isolation, but SERIALIZABLE will still be used except | > > > > > > > > > > | 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 | may only be set if the database has not yet been created. The page size must be a power of two greater than or equal to 512 and less than or equal to 8192. The upper limit may be modified by setting the value of macro SQLITE_MAX_PAGE_SIZE during compilation. The maximum upper bound is 32768. </p> </li> <a name="pragma_max_page_count"></a> <li><p><b>PRAGMA max_page_count; <br>PRAGMA max_page_count = </b><i>N</i><b>;</b></p> <p>Query or set the maximum number of pages in the database file. Both forms of the pragma return the maximum page count. The second form attempts to modify the maximum page count. The maximum page count cannot be reduced below the current database size. </p> </li> <a name="pragma_read_uncommitted"></a> <li><p><b>PRAGMA read_uncommitted; <br>PRAGMA read_uncommitted = </b><i>0 | 1</i><b>;</b></p> <p>Query, set, or clear READ UNCOMMITTED isolation. The default isolation level for SQLite is SERIALIZABLE. Any process or thread can select READ UNCOMMITTED isolation, but SERIALIZABLE will still be used except |
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