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Overview
| Comment: | Improved testability. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | wal-overwrite-frames |
| Files: | files | file ages | folders |
| SHA1: |
e83d3a2a4e06665e8a056f63063bd6df |
| User & Date: | drh 2016-01-11 00:52:32 |
Context
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2016-01-11
| ||
| 08:12 | Add a test case to waloverwrite.test to check that savepoint rollback does not cause a problem. Closed-Leaf check-in: 87dae56c user: dan tags: wal-overwrite-frames | |
| 00:52 | Improved testability. check-in: e83d3a2a user: drh tags: wal-overwrite-frames | |
|
2016-01-09
| ||
| 23:55 | All WAL frame overwrites even if there are active savepoints. This is safe because a ROLLBACK TO will cause all reverted pages to be rewritten to the WAL file prior to COMMIT. check-in: 99b31a6b user: drh tags: wal-overwrite-frames | |
Changes
Changes to src/wal.c.
3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 |
/* Check if this page has already been written into the wal file by
** the current transaction. If so, overwrite the existing frame and
** set Wal.writeLock to WAL_WRITELOCK_RECKSUM - indicating that
** checksums must be recomputed when the transaction is committed. */
if( iFirst && (p->pDirty || isCommit==0) ){
u32 iWrite = 0;
rc = sqlite3WalFindFrame(pWal, p->pgno, &iWrite);
if( rc ) return rc;
if( iWrite>=iFirst ){
i64 iOff = walFrameOffset(iWrite, szPage) + WAL_FRAME_HDRSIZE;
if( pWal->iReCksum==0 || iWrite<pWal->iReCksum ){
pWal->iReCksum = iWrite;
}
rc = sqlite3OsWrite(pWal->pWalFd, p->pData, szPage, iOff);
if( rc ) return rc;
|
| | |
3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 |
/* Check if this page has already been written into the wal file by
** the current transaction. If so, overwrite the existing frame and
** set Wal.writeLock to WAL_WRITELOCK_RECKSUM - indicating that
** checksums must be recomputed when the transaction is committed. */
if( iFirst && (p->pDirty || isCommit==0) ){
u32 iWrite = 0;
VVA_ONLY(rc =) sqlite3WalFindFrame(pWal, p->pgno, &iWrite);
assert( rc==SQLITE_OK || iWrite==0 );
if( iWrite>=iFirst ){
i64 iOff = walFrameOffset(iWrite, szPage) + WAL_FRAME_HDRSIZE;
if( pWal->iReCksum==0 || iWrite<pWal->iReCksum ){
pWal->iReCksum = iWrite;
}
rc = sqlite3OsWrite(pWal->pWalFd, p->pData, szPage, iOff);
if( rc ) return rc;
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