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Overview
| Comment: | In persistent WAL mode, truncate the WAL file to the size specified by the journal_size_limit pragma when disconnecting from the WAL. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
9687b305c2320109a8649612181eecd2 |
| User & Date: | drh 2011-12-08 19:50:32.953 |
Context
|
2011-12-08
| ||
| 20:41 | Hand merge the zone allocator for MacOS from the apple-osx branch. (check-in: 0d955c20c0 user: drh tags: trunk) | |
| 19:50 | In persistent WAL mode, truncate the WAL file to the size specified by the journal_size_limit pragma when disconnecting from the WAL. (check-in: 9687b305c2 user: drh tags: trunk) | |
| 03:51 | Follow the previously established pattern for detecting preprocessor defines for specific flavors of Windows (for NT in this case). (check-in: a0d92193dd user: mistachkin tags: trunk) | |
Changes
Changes to src/wal.c.
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}
}
walcheckpoint_out:
walIteratorFree(pIter);
return rc;
}
/*
** Close a connection to a log file.
*/
int sqlite3WalClose(
Wal *pWal, /* Wal to close */
int sync_flags, /* Flags to pass to OsSync() (or 0) */
| > > > > > > > > > > > > > > > > > > > > | 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 |
}
}
walcheckpoint_out:
walIteratorFree(pIter);
return rc;
}
/*
** Attempt to limit the WAL size to the size limit defined by
** PRAGMA journal_size_limit.
*/
static void walLimitSize(Wal *pWal){
if( pWal->mxWalSize>=0 ){
i64 sz;
int rx;
sqlite3BeginBenignMalloc();
rx = sqlite3OsFileSize(pWal->pWalFd, &sz);
if( rx==SQLITE_OK && (sz > pWal->mxWalSize) ){
rx = sqlite3OsTruncate(pWal->pWalFd, pWal->mxWalSize);
}
sqlite3EndBenignMalloc();
if( rx ){
sqlite3_log(rx, "cannot limit WAL size: %s", pWal->zWalName);
}
}
}
/*
** Close a connection to a log file.
*/
int sqlite3WalClose(
Wal *pWal, /* Wal to close */
int sync_flags, /* Flags to pass to OsSync() (or 0) */
|
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}
rc = sqlite3WalCheckpoint(
pWal, SQLITE_CHECKPOINT_PASSIVE, 0, 0, sync_flags, nBuf, zBuf, 0, 0
);
sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_PERSIST_WAL, &bPersistWal);
if( rc==SQLITE_OK && bPersistWal!=1 ){
isDelete = 1;
}
}
walIndexClose(pWal, isDelete);
sqlite3OsClose(pWal->pWalFd);
if( isDelete ){
sqlite3OsDelete(pWal->pVfs, pWal->zWalName, 0);
| > > | 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 |
}
rc = sqlite3WalCheckpoint(
pWal, SQLITE_CHECKPOINT_PASSIVE, 0, 0, sync_flags, nBuf, zBuf, 0, 0
);
sqlite3OsFileControl(pWal->pDbFd, SQLITE_FCNTL_PERSIST_WAL, &bPersistWal);
if( rc==SQLITE_OK && bPersistWal!=1 ){
isDelete = 1;
}else{
walLimitSize(pWal);
}
}
walIndexClose(pWal, isDelete);
sqlite3OsClose(pWal->pWalFd);
if( isDelete ){
sqlite3OsDelete(pWal->pVfs, pWal->zWalName, 0);
|
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pWal->hdr.aFrameCksum[0] = aWalData[1];
pWal->hdr.aFrameCksum[1] = aWalData[2];
walCleanupHash(pWal);
}
return rc;
}
/*
** This function is called just before writing a set of frames to the log
** file (see sqlite3WalFrames()). It checks to see if, instead of appending
** to the current log file, it is possible to overwrite the start of the
** existing log file with the new frames (i.e. "reset" the log). If so,
** it sets pWal->hdr.mxFrame to 0. Otherwise, pWal->hdr.mxFrame is left
| > | 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 |
pWal->hdr.aFrameCksum[0] = aWalData[1];
pWal->hdr.aFrameCksum[1] = aWalData[2];
walCleanupHash(pWal);
}
return rc;
}
/*
** This function is called just before writing a set of frames to the log
** file (see sqlite3WalFrames()). It checks to see if, instead of appending
** to the current log file, it is possible to overwrite the start of the
** existing log file with the new frames (i.e. "reset" the log). If so,
** it sets pWal->hdr.mxFrame to 0. Otherwise, pWal->hdr.mxFrame is left
|
| ︙ | ︙ | |||
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** at this point. But updating the actual wal-index header is also
** safe and means there is no special case for sqlite3WalUndo()
** to handle if this transaction is rolled back.
*/
int i; /* Loop counter */
u32 *aSalt = pWal->hdr.aSalt; /* Big-endian salt values */
| < < < < < < < < < < < < < < < < | | 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 |
** at this point. But updating the actual wal-index header is also
** safe and means there is no special case for sqlite3WalUndo()
** to handle if this transaction is rolled back.
*/
int i; /* Loop counter */
u32 *aSalt = pWal->hdr.aSalt; /* Big-endian salt values */
walLimitSize(pWal);
pWal->nCkpt++;
pWal->hdr.mxFrame = 0;
sqlite3Put4byte((u8*)&aSalt[0], 1 + sqlite3Get4byte((u8*)&aSalt[0]));
aSalt[1] = salt1;
walIndexWriteHdr(pWal);
pInfo->nBackfill = 0;
for(i=1; i<WAL_NREADER; i++) pInfo->aReadMark[i] = READMARK_NOT_USED;
|
| ︙ | ︙ |
Changes to test/walpersist.test.
| ︙ | ︙ | |||
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file_control_persist_wal db 1
} {0 1}
do_test walpersist-1.11 {
db close
list [file exists test.db] [file exists test.db-wal] [file exists test.db-shm]
} {1 1 1}
| | > > > > > > > > > > > | > > > > > > > | 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 |
file_control_persist_wal db 1
} {0 1}
do_test walpersist-1.11 {
db close
list [file exists test.db] [file exists test.db-wal] [file exists test.db-shm]
} {1 1 1}
# Make sure the journal_size_limit works to limit the size of the
# persisted wal file.
forcedelete test.db test.db-shm test.db-wal
do_test walpersist-2.1 {
sqlite3 db test.db
db eval {
PRAGMA journal_mode=WAL;
PRAGMA wal_autocheckpoint=OFF;
PRAGMA journal_size_limit=12000;
CREATE TABLE t1(x);
INSERT INTO t1 VALUES(randomblob(50000));
UPDATE t1 SET x=randomblob(50000);
}
expr {[file size test.db-wal]>100000}
} {1}
do_test walpersist-2.2 {
file_control_persist_wal db 1
db close
file size test.db-wal
} {12000}
finish_test
|