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osql command to delete .mdf file on c:

Posted on 2006-11-07
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Last Modified: 2008-01-09
Hi,

    I am running an Osql script that backs up a mdf through a script. Is there a way in Osql that I could delete the mdf on the C: drive after x amount of days?
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Question by:missymadi
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Expert Comment

by:regbes
ID: 17890963
Hi missymadi,

if you can do it in a batch file run the batch file with xp_cmdshell

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by:missymadi
ID: 17894115
Does anyone have the code\syntax to delete a file on C: from osql?
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by:nmcdermaid
ID: 17894727
You run OSQL from the command line. Therefore you could just detach the database within ISQL and then run a standard DEL dos command.

i.e. your batch file would look like this:

OSQL ............ your commands
OSQL  .......... a sp_detach_db command to detach the MDF
DEL your MDF file


Unless of course the MDF filename is known only within SQL.... then you need to use xp_cmdshell as mentioned.
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Author Comment

by:missymadi
ID: 17895116
What I looking for is a line of code that would run something like this

Delete database.mdf on C: after 7 days. It is the database.mdf file that I need to erase on the C: drive not within SQL.

What is the specific syntax for this command?

For example:
BACKUP DATABASE TEST to Disk=C:\TEST.bak

How do I delete TEST.bak on the C: drive every 7 days through and OSQL command?
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Expert Comment

by:nmcdermaid
ID: 17896358
The DOS command is this:

DEL Test.MDF



The OSQL command is this:


EXEC master.dbo.xp_cmdshell 'DEL Test.MDF'


The tricky part is working out how old the file before deciding to delete it. This can probably be done in T-SQL but before I start down that road, this is a very curious requirement.... why do you want to delete MDF files that are 7 days old?
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by:regbes
ID: 17896380
backing up the MDF files as a backup strategy is not recomended

why do you not set up a maintnance plan and set the plan only to keep the last 3 weeks of backups?
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by:missymadi
ID: 17906781
Hi Nmcdermaid,

     Request from my boss to delete the .mdf from the C: drive after "x" amount of days. What he is looking for is something to run daily that looks for the oldest directories and deletes them. The OSQL commands will be added to an existing script.

If there is a better strategy, please advise.

Thanks for your help!
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by:regbes
ID: 17907020
missymadi,

why do you not set up a maintnance plan to back the database up and set the plan only to keep the last 3 weeks of backups?
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Expert Comment

by:nmcdermaid
ID: 17924637
What's the big picture? it is very unusual to delete databases after they get to a certain age. Won't someone be using the database?


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Author Comment

by:missymadi
ID: 17931062
Hi,

    This is for an SQL instance of a database that cannot be backed up through Enterprise Manager.

What we hope to accomplish: Back up an instance of a db to a separate location, say c:, for 7 days. When the date of backup is older than 7 days, delete the backup copy of the db instance.

The line of code is added to an existing script we have

c:\>osql -s peach\fracascorp -u sa
password
1>backup database fracas to disk="c:\fracas.bak"
2>go

This is only to back this db up in case of failure. Everytime this runs, another full copy of fracas is copied to c:\fracas.bak. We wanted to delete the fracas.bak after  7 days.

Is there a better solution? I have looked into Enterprise Manager to back up the db but I'm guessing because it is an instance all options are not available.
Help, Thanks!
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Expert Comment

by:regbes
ID: 17931933
> This is for an SQL instance of a database that cannot be backed up through Enterprise Manager.
not too sure such a thing exsists - if you set a maintnance plan for it up correctly it will be backed up and old backups cleaned up

or what about
c:\>osql -s peach\fracascorp -u sa
password
1>backup database fracas to disk="c:\fracas.bak" with RETAINDAYS = 7
2>go
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Author Comment

by:missymadi
ID: 17933306
HI Regbes,

       When you say set up a maintenance plan, do you mean through Enterprise Manager or another tool?

Thanks!
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Expert Comment

by:regbes
ID: 17936214
missymadi,

Through Enterprise Manager

you should be able to connect to any database and manage it with EM it does not matter if it is an instance or the default install
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Author Comment

by:missymadi
ID: 17939029
Thanks for the info.

 I went through Database Maintenance through EM and set up a test backup. The maintenance plan will not hold the destination folder. Is there a white paper on how to set a maintenance plan?

Thanks.
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regbes earned 75 total points
ID: 17940120
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