Xp_cmdshell

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Xp_cmdshell

river1

SSC-Insane

Points: 24309
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July 12, 2010 at 8:53 am

#223757

Hi,
i am trying to create a xp_cmdshell to execute the DBCC checkDB comand and same the output to a txt file. Can someone help, please?
Thank you.

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Tara Kizer SSCommitted Points: 1789 More actions · Answer 1

You don't need to use xp_cmdshell for this. Just run DBCC CHECKDB directly inside a query window in SSMS and select the option to output it to a file.

Or is there another reason why xp_cmdshell is wanted here?

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
Ramblings of a DBA (My SQL Server Blog)[/url]
Subscribe to my blog

river1 SSC-Insane Points: 24309 More actions · Answer 2

yes, there is , i am running this command from a VB application (nor in query window).

I have achieved this goal yesterday.

Thank you for the reply.

Tara Kizer SSCommitted Points: 1789 More actions · Answer 3

If you are using a VB application, then there is no need to use xp_cmdshell for this.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
Ramblings of a DBA (My SQL Server Blog)[/url]
Subscribe to my blog

chauhanparixit SSC-Addicted Points: 429 More actions · Answer 4

chauhanparixit

SSC-Addicted

Points: 429

July 3, 2013 at 4:22 am

#1629461

use SQLCMD or something.

Jeff Moden SSC Guru Points: 1004290 More actions · Answer 5

Tara Kizer (7/13/2010)
If you are using a VB application, then there is no need to use xp_cmdshell for this.

Since I'm no VB expert but still very curious, how would you do it from VB?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Jeff Moden SSC Guru Points: 1004290 More actions · Answer 6

chauhanparixit (7/3/2013)
use SQLCMD or something.

How do you do that from VB?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Lowell SSC Guru Points: 323518 More actions · Answer 7

Jeff Moden (7/3/2013)
Tara Kizer (7/13/2010)
If you are using a VB application, then there is no need to use xp_cmdshell for this.
Since I'm no VB expert but still very curious, how would you do it from VB?

it's nothing more than creating a connection to the server so you can run the same commands you would in SSMS;

an application would never call xp_cmdshell; xp_cmdshell is specific to SQL Server, and how it interacts with the operating system.

that would be like using word to embed an excel spreadhseet with a macro to open word.

I'm confused, like others, as to why need to have SQL Server call an application to do work in SQL server...that's just adding intermediate steps, which can fail for a variety of reasons, when it can be done directly.

anyway, some code examples, because, well, that's what i do!

'VB.NET

Dim sqlcmd As String = "DBCC CHECKDB('SANDBOX') WITH DATA_PURITY"

Dim mySqlConnectionFormat As String = "data source={0};initial catalog={1};user id={2};password={3};Trusted_Connection=False;Connect Timeout=600;Application Name=GhostInTheMachine;"

Dim MyConn As New SqlConnection

MyConn.ConnectionString = String.Format(mySqlConnectionFormat, ".", "SandBox", "Noobie", "NotARealPassword")

MyConn.Open()

'now lets get a command object

Dim mySqlCommand As New SqlCommand

mySqlCommand.Connection = MyConn

mySqlCommand.CommandTimeout = 600

mySqlCommand.CommandType = CommandType.Text

mySqlCommand.CommandText = sqlcmd

mySqlCommand.ExecuteNonQuery()

'vb6

Dim sqlcmd As String

sqlcmd = "DBCC CHECKDB('SANDBOX') WITH DATA_PURITY"

Dim myConn As New ADODB.Connection

Dim MyConnectionString As String

MyConnectionString ="PROVIDER=SQLOLEDB;DATA SOURCE=MyServer;UID=Noobie;PWD=NotARealPassword;DATABASE=SandBox;"

myConn.ConnectionString = MyConnectionString

myConn.CursorLocation = adUseClient

myConn.CommandTimeout = 600

myConn.ConnectionTimeout = 600

myConn.Open

myConn.Execute(sqlcmd)

Lowell

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Jeff Moden SSC Guru Points: 1004290 More actions · Answer 8

@lowell,

Thank you for the coded example. Much appreciated. That's kind of what I thought it was going to be but haven't touched VB since 2002 and didn't want to hazard a guess. Essentially, a "simple" result set.

I wouldn't allow the app to call DBCC CheckDB directly, though. It requires either DBO or SA privs and it's extremely unlikely (there's always the tooth of a chicken exception) that I'd allow an app to have that level of privs. I'd likely build a stored proc that did the deed using WITH EXECUTE AS OWNER and grant the app privs to run the proc (along with the appropriate delousing for SQL Injection, etc., in the stored proc).

I also wonder why the OP wants this output to be written to a file, to being with.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Jeff Moden SSC Guru Points: 1004290 More actions · Answer 9

river1 (7/12/2010)
Hi,
i am trying to create a xp_cmdshell to execute the DBCC checkDB comand and same the output to a txt file. Can someone help, please?
Thank you.

Please see above. As folks have stated, you don't need xp_CmdShell for this. You should also (as stated above) not call DBCC CheckDB directly from the app so that the app doesn't require inappropriately high privs. Rather, create a stored proc to execute with the owner privs and give the app privs to run that proc. An app with even just PUBLIC privs will be able to run the proc without having the ability to run anything that could actually cause grave damage to the server.

My question would be, why do you want to save the output of this command in a file on the files system? What will you do with that file afterwards?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)