Solved

BACKUP LOG cannot be performed because there is no current database backup.

Posted on 2009-07-02
6
1,271 Views
Last Modified: 2012-05-07
Hi,

Im currently trying to create a job to backup our transaction logs on an hourly bases. When I use the following command: -

BACKUP LOG  [testdata] TO DISK = N'G:\testdata.trn';

It comes up with the following message: -

BACKUP LOG cannot be performed because there is no current database backup

The current backup strategy is a full backup everynight at midnight using the following commands in a job: -

-- database backup file manipulation
EXEC master..xp_cmdshell 'del Z:\MSSQL\BACKUP\ONE_DAY_OLD\testdata_old.bak /Q';      -- delete old copy of backup
EXEC master..xp_cmdshell 'copy Z:\MSSQL\BACKUP\DAILY\testdata.bak Z:\MSSQL\BACKUP\ONE_DAY_OLD\testdata_old.bak';  -- copy last night's backup to ONE_DAY_OLD
EXEC master..xp_cmdshell 'del Z:\MSSQL\BACKUP\DAILY\testdata.bak /Q';      -- delete current copy of backup

-- log file manipulation
EXEC master..xp_cmdshell 'del Z:\MSSQL\BACKUP\ONE_DAY_OLD\testdata_old.trn /Q';      -- delete old copy of backup
EXEC master..xp_cmdshell 'copy Z:\MSSQL\BACKUP\DAILY\testdata.trn Z:\MSSQL\BACKUP\ONE_DAY_OLD\testdata_old.trn';  -- copy last night's backup to ONE_DAY_OLD
EXEC master..xp_cmdshell 'del Z:\MSSQL\BACKUP\DAILY\testdata.trn /Q';      -- delete current copy of backup

BACKUP DATABASE [testdata] TO  DISK = N'Z:\MSSQL\BACKUP\DAILY\testdata.bak' WITH  NOINIT ,  NOUNLOAD ,  NAME = N'testdata_daily',  NOSKIP ,  STATS = 10,  NOZORMAT
BACKUP LOG  [testdata] TO DISK = N'Z:\MSSQL\BACKUP\DAILY\testdata.trn';

backup log [testdata] with truncate_only;

dbcc shrinkfile(testdata_log,0);

Am I right in saying that if you use backup log [testdata] with truncate_only; it breaks the backup chain and hence I am getting this message? Also that the shrinkfile command will commit the transactions of the log into the main database file?

Many Thanks
Lee
0
Comment
Question by:ljhodgett
  • 4
  • 2
6 Comments
 
LVL 57

Expert Comment

by:Raja Jegan R
ID: 24761635
Kindly take a Full Backup and then try doing your Log Backup.

BACKUP LOG  [testdata] TO DISK = N'G:\testdata.trn';

And after that have regular Transactional Log Backups with reduced time intervals as of now.

http://msdn.microsoft.com/en-us/library/aa173551(SQL.80).aspx

Hope this helps
0
 
LVL 57

Expert Comment

by:Raja Jegan R
ID: 24761645
>> Am I right in saying that if you use backup log [testdata] with truncate_only; it breaks the backup chain

Depends upon situation.
1. Using TRUNCATE_ONLY breaks the Backup chain if you do it before your Full Backup or Differential Backup.
2. Using TRUNCATE_ONLY breaks the Backup chain if you do it after your Full Backup or Differential Backup.

>> and hence I am getting this message?

No..

>> Also that the shrinkfile command will commit the transactions of the log into the main database file?

It will Discard the uncommitted transactions and it Wont commit.
0
 
LVL 57

Expert Comment

by:Raja Jegan R
ID: 24761652
The error you mentioned "BACKUP LOG cannot be performed because there is no current database backup" will happen:

When you change the database to simple to truncate the log, then back to full recovery. You have to do a manual full backup before you can do a log back up again.

Hence do a Full Backup manually now as mentioned earlier and this would solve this problem
0
Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

 

Author Comment

by:ljhodgett
ID: 24761823
Hi,

Sorry the database is set as full recovery model.

I've run the following on the development server: -

BACKUP DATABASE [testdata] TO  DISK = N'C:\testdata.bak' WITH  NOINIT ,  NOUNLOAD ,  NAME = N'testdata_daily',  NOSKIP ,  STATS = 10,  NOFORMAT
BACKUP LOG  [testdata] TO DISK = N'C:\testdata.trn';

and it completes sucessfully. I can backup the transaction logs everytime afterwards using : -

BACKUP LOG  [testdata] TO DISK = N'C:\testdata.trn';

As soon as I do the following it comes up with the error messages when trying to backup the transaction logs: -

backup log [testdata] with truncate_only;

dbcc shrinkfile(testdata_Log,0);

Best Regards
Lee
0
 

Author Comment

by:ljhodgett
ID: 24761926
Hi,

I've found that the following command once executed give me the error message: -

backup log [testdata] with truncate_only;

Is this line strickly necessary?

Many Thanks
Lee
0
 
LVL 57

Accepted Solution

by:
Raja Jegan R earned 500 total points
ID: 24761968
>> backup log [testdata] with truncate_only;

Above statement is not required if you intend to run the below command after your Full Backup or Differential Backup.

dbcc shrinkfile(testdata_Log,0);
0

Featured Post

NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Use this article to create a batch file to backup a Microsoft SQL Server database to a Windows folder.  The folder can be on the local hard drive or on a network share.  This batch file will query the SQL server to get the current date & time and wi…
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question