Restore LDF file after restoring backups in SQL Server 2005?

[l0b0]

I'm working on a restore procedure for the case where all MDF files
are missing, but the LDF files are all intact. A full backup is done
every 24 hours, and a log backup is done every 3 hours. After
restoring the last full + log backups, is it at all possible to use
the LDF files to recover data from that point up to a newer point in
time?

I've found a post which explains how to do this on SQL Server 2000
<http://groups.google.com/group/comp.....ms-sqlserver/
browse_thread/thread/3ef5c7cbc0a8333 4/f3b0c70811d35ed 7>, but step 4
fails with the following error message:
BACKUP LOG cannot be performed because there is no current database
backup.

[Erland Sommarskog]

Re: Restore LDF file after restoring backups in SQL Server 2005?

l0b0 (victor.engmark @gmail.com) writes:

I'm working on a restore procedure for the case where all MDF files
are missing, but the LDF files are all intact. A full backup is done
every 24 hours, and a log backup is done every 3 hours. After
restoring the last full + log backups, is it at all possible to use
the LDF files to recover data from that point up to a newer point in
time?

At that point it may be a little late. Say that disaster strikes and
your MDF file is dead. At this point you can perform BACKUP LOG WITH
NO_TRUNCATE to back up the log. Then you restore and apply all logs
including this one.

I've found a post which explains how to do this on SQL Server 2000
><http://groups.google.com/group/comp.....ms-sqlserver/
browse_thread/thread/3ef5c7cbc0a8333 4/f3b0c70811d35ed 7>, but step 4
fails with the following error message:
BACKUP LOG cannot be performed because there is no current database
backup.

It seems that Dan left out one point his post. And which point is fairly
obvious: you need to take a full backup of the newly created dummy database.
Since Dan read this group regularly, I hope is able to step in and clarify.



--
Erland Sommarskog, SQL Server MVP, esquel@sommarsk og.se

Books Online for SQL Server 2005 at

http://www.microsoft.com/technet/prodtechnol/sql/2005/downloads/books.mspx

Books Online for SQL Server 2000 at

http://www.microsoft.com/sql/prodinfo/previousversions/books.mspx

[l0b0]

Re: Restore LDF file after restoring backups in SQL Server 2005?

On Aug 22, 12:38 pm, Erland Sommarskog <esq...@sommars kog.sewrote:

l0b0 (victor.engm... @gmail.com) writes:

I'm working on a restore procedure for the case where all MDF files
are missing, but the LDF files are all intact. A full backup is done
every 24 hours, and a log backup is done every 3 hours. After
restoring the last full + log backups, is it at all possible to use
the LDF files to recover data from that point up to a newer point in
time?

>
At that point it may be a little late. Say that disaster strikes and
your MDF file is dead. At this point you can perform BACKUP LOG WITH
NO_TRUNCATE to back up the log. Then you restore and apply all logs
including this one.

Thanks! I ended up doing the following:
1. BACKUP LOG database TO DISK = 'C:\database.ba k' WITH NO_TRUNCATE;
2. Restore full + log backups without recovery
3. RESTORE LOG database FROM DISK='C:\databa se.bak' WITH MOVE
'database_log' TO 'L:\database_lo g.LDF', RECOVERY;

It works fine.