I am trying to attach a database just from the MDF file, cause the server crashed and could never find the LDF. I am on a 2019 MS SQL Server. I am following the instructions from this page. I have created the database, took it offline and swapped my MDF and deleted the created LDF. Then put back online. When I run the following command I get the following:

UPDATE sysdatabases
SET status = 32768
WHERE name = 'MyDB'

Ad hoc updates to system catalogs are not allowed.

I ran the previous command without problems

sp_CONFIGURE 'allow updates', 1

Configuration option 'allow updates' changed from 0 to 1. Run the RECONFIGURE statement to install.

Furthermore, if I run the next command, I get the following:

DBCC REBUILD_LOG(Database_Name, 'g:\Program Files\Microsoft SQL Server\MSSQL15.AUS\MSSQL\Data\MyDB.ldf')

DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Msg 2526, Level 16, State 3, Line 2
Incorrect DBCC statement. Check the documentation for the correct DBCC syntax and options.
  • Consider this thread about attaching MDF without LDF. If you care about the data A LOT, you should hire some expertise and stop wasting your time with spam blogs.
    – SMor
    Commented May 1, 2020 at 21:25
  • I've tried that but get the error: The log cannot be rebuilt because there were open transactions/users when the database was shutdown, no checkpoint occurred to the database, or the database was read-only. This error could occur if the transaction log file was manually deleted or lost due to a hardware or environment failure.
    – Rick
    Commented May 1, 2020 at 21:35

2 Answers 2


That is not an authoritative source. Please follow Paul Randal's process here, as he's the one who "decided to add a new feature to SQL Server 2005 called EMERGENCY-mode repair".


Paul Randals's process will bring you DB online but there is good chances that you end up with a corrupted database.

Would be a better approch to simply restore the database from your backup (if you had backup).

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.