SQL Backup 4.2 Build 511 - new keyword MAXTRANSFERSIZE

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SQL Backup 4.2 Build 511 - new keyword MAXTRANSFERSIZE

Postby HJoyce » Wed May 10, 2006 5:15 pm

There is an updated version of the server side components which offers a new keyword, MAXTRANSFERSIZE.

Download from: ftp://ftp.red-gate.com/SQB4.2.0.511.zip

Copy SQBServerSetup.exe and SQLBackupC.exe to the installation directory. To upgrade the server components run SQBServerSetup.exe. Alternatively you can upgrade each instance from the GUI by selecting the SQL Server instance in the left hand panel, right click and select Install/upgrade server components

MAXTRANSFERSIZE indicates to SQL Server the maximum size of each block of memory that it uses to store backup data, prior to SQL Backup compressing/encrypting the data.

Options are:

MAXTRANSFERSIZE = 1048576 (1 MB) (default)
MAXTRANSFERSIZE = 524288 (512 KB)
MAXTRANSFERSIZE = 262144 (256 KB)
MAXTRANSFERSIZE = 131072 (128 KB)
MAXTRANSFERSIZE = 65536 (64 KB)

For example,
master..sqlbackup N'-SQL "BACKUP DATABASE [DatabaseA] TO DISK = ''<AUTO>'' WITH COMPRESSION = 1, MAXTRANSFERSIZE = 524288"'

master..sqlbackup N'-SQL "RESTORE DATABASE [DatabaseA] FROM DISK = ''C:\\DatabaseA.sqb''WITH RECOVERY, MAXTRANSFERSIZE = 262144"'

This is particularly useful if you experience an error such as "Failed to close vdi".
In this case the VDI.log will show for example
"Error at ServerBufferAreaManager::Allocate: Map buffers Status Code: 8, x8
Explanation: Not enough storage is available to process this command."


In this case you can use the MAXTRANSFERSIZE keyword with a lower value than the 1MB default, e.g. MAXTRANSFERSIZE = 524288
Last edited by HJoyce on Thu May 11, 2006 6:46 pm, edited 1 time in total.
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Postby JeffatWork » Wed May 10, 2006 8:58 pm

I have found the new parameter useful while performing backups. Can we use MAXTRANSFER size with the RESTORE command as well?
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Postby HJoyce » Thu May 11, 2006 6:47 pm

Yes, you can using build 511 of the server components.
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Postby randyj » Tue Jun 13, 2006 8:45 pm

Despite having just loaded the patch for this, I continue to get errors on backup-
SQL Backup exit code :1050
SQL error code:3202

Write on "SQLBACKUO_<string>" failed: 112(There is not enough space on the disk.)
Failed to close vdi
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Postby petey » Wed Jun 14, 2006 2:43 am

What is the MAXTRANSFERSIZE value that you are using?
Peter Yeoh
SQL Backup Consultant Developer
Associate, Yohz Software
Beyond compression - SQL Backup goodies under the hood, updated for version 7
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Postby randyj » Wed Jun 14, 2006 3:15 pm

Pete-
I tried ALL the suggested values for MAXTRANSFERSIZE, from 1 MB down to 64 KB, and got the same result.
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Postby petey » Wed Jun 14, 2006 4:55 pm

Was the backup file created at all, or maybe part of the file? I'm trying to determine if the backup failed at the very beginning, or midway through the backup. Thanks.
Peter Yeoh
SQL Backup Consultant Developer
Associate, Yohz Software
Beyond compression - SQL Backup goodies under the hood, updated for version 7
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Postby randyj » Wed Jun 14, 2006 4:59 pm

Actually, acting on advice from Brian, I added the 'MAXDATABLOCK = 1048576" parameter, and all seems happy now, woithout using the MAXTRANSFERSIZE parameter.

As I recall, the file was partially created, but I'm not sure how much was written (if any) or if the file was merely created, and not written to.
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question about updating

Postby lslmustang » Tue Jul 18, 2006 8:12 pm

We have strict security on our browser on the server where our application is located so I get an error that I can't check for updates with the application (we are not allowed to run javascript on the server). Is there an ftp site to get the latest versions instead or is the only way is to download the latest trial version?
Thanks,
Linda
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Postby HJoyce » Thu Jul 20, 2006 4:32 pm

Hi.

Yes you can get the latest version from ftp://ftp.red-gate.com/SQLBackupRescueBundle.zip
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