When overwriting the original, a rollback journal or write-ahead log WAL file is used just as it would be for any other database transaction.
当将内容重新写回到原始数据库文件时，一个回滚日志或者写前日志wal文件将会被使用，正如它为其它数据库事务服务一样。
Write-ahead log scheme requires stable storage.
向前写日志系统需要稳定存储。
When in write-ahead log mode, only the auto_vacuum support property can be changed using VACUUM.
如果SQLite是运行在“写前日志”模式下，则只有（是否支持）auto_vacuum属性可以通过VACUUM命令进行修改。）
When in write-ahead log mode, only the auto_vacuum support property can be changed using VACUUM.
如果SQLite是运行在“写前日志”模式下，则只有（是否支持）auto_vacuum属性可以通过VACUUM命令进行修改。）
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