* Only do "pragma journal_mode = ..." if the current journal mode
differs from the desired mode. There is an open SQLite ticket `Executing "PRAGMA journal_mode" may delete journal file while it is in use.'
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@ -303,7 +303,16 @@ void LocalStore::openDB(bool create)
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The downside is that it doesn't work over NFS, so allow
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truncate mode alternatively. */
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string mode = queryBoolSetting("use-sqlite-wal", true) ? "wal" : "truncate";
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if (sqlite3_exec(db, ("pragma main.journal_mode = " + mode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
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string prevMode;
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{
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SQLiteStmt stmt;
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stmt.create(db, "pragma main.journal_mode;");
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if (sqlite3_step(stmt) != SQLITE_ROW)
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throw SQLiteError(db, "querying journal mode");
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prevMode = string((const char *) sqlite3_column_text(stmt, 0));
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}
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if (prevMode != mode &&
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sqlite3_exec(db, ("pragma main.journal_mode = " + mode + ";").c_str(), 0, 0, 0) != SQLITE_OK)
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throw SQLiteError(db, "setting journal mode");
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/* Increase the auto-checkpoint interval to 8192 pages. This
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