SQL server only has database files and no log files. The solution to the 1813 error in restoring data times

Unable to open new database 'ASR'.CREATE DATABASE suspend .
File activation failed . Physical file name 'E:\SqlServer\MSSQL\Data\ASR_log.LDF' It may not be right .
Unable to regenerate log , The reason is that there are open transactions when the database is closed / user , The database has no checkpoints or the database is read-only . If the transaction log file is manually deleted or lost due to hardware or environmental problems , This error may occur . (Microsoft SQL Server, error : 1813)

Solution ：

1、 Create a new database with the same name .

2、 Stop database service , Overlay the new database master file （ Tips ： It's best to put it in the same disk , Delete or move the new database master file , Then cut the main database file to be restored , This will save time .）

3、 Start database service , The database becomes suspect or suspicious . Then run in the query analyzer ：

alter database Database name without log file set emergency

Set to emergency .

4、 Run again ：

alter database Database name without log file set single_user

perhaps ：

Sp_dboption ' Database name without log file ', 'single user', 'true'

Set to single user mode .

5、 Check and rebuild the log file , function ：

dbcc checkdb(' Database name without log file ',REPAIR_ALLOW_DATA_LOSS)

This is a long time . Wait patiently ！ If there is an error prompt , Run again ：

dbcc checkdb(' Database name without log file ',REPAIR_REBUILD)

Make repairs . If there are no mistakes , You can skip .

6、 Revert to multi-user mode

alter database Database name without log file set multi_user

perhaps ：

Sp_dboption ' Database name without log file ', 'single user', 'false'

Refresh database , You can see the repaired database .