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If, after obtaining a SHARED lock, there exists a *-wal file in the file-system, use WAL mode. This is necessary to recover from a crash that damages the first page of the database file.

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FossilOrigin-Name: 33cabf271b8f4dda508a610bf59964273fe2cb84
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dan
2010-04-21 11:43:38 +00:00
parent 28e5386f79
commit a470aeb4ac
6 changed files with 138 additions and 59 deletions
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9
src/btree.c
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@@ -2268,7 +2268,14 @@ static int lockBtree(BtShared *pBt){
goto page1_init_failed;
}
/* If the write version is set to 2, turn on write-ahead logging mode. */
/* If the write version is set to 2, this database should be accessed
** in WAL mode. If the log is not already open, open it now. Then
** return SQLITE_OK and return without populating BtShared.pPage1.
** The caller detects this and calls this function again. This is
** required as the version of page 1 currently in the page1 buffer
** may not be the latest version - there may be a newer one in the log
** file.
*/
if( page1[19]==2 ){
int isOpen = 0;
rc = sqlite3PagerOpenLog(pBt->pPager, &isOpen);