If you want to enable Xp_CmdShell extended stored procedure in Sql in order to execute or write data from within OS.
Msg 15281, Level 16, State 1, Procedure xp_cmdshell, Line 1
SQL Server blocked access to procedure ‘sys.xp_cmdshell’ of component ‘xp_cmdshell’ because this component is turned off as part of the security configuration for this server. A system administrator can enable the use of ‘xp_cmdshell’ by using sp_configure. For more information about enabling ‘xp_cmdshell’, see “Surface Area Configuration” in SQL Server Books Online.
The following commands can be applied from within Management Studio:
EXEC sp_configure ‘show advanced options’, 1
GO
— To update the currently configured value for advanced options.
RECONFIGURE
GO
— To enable the feature.
EXEC sp_configure ‘xp_cmdshell’, 1
GO
— To update the currently configured value for this feature.
RECONFIGURE
GO