Dedicated Administrator Connection (DAC)

SQLCMD is particularly useful for creating batch scripting jobs for administrative purposes. SQLCMD has replace OSQL. It is using OLEDB to connect the SQL Server. However, as an emergency utility to diagnose and hopefully correct server problems, it has no peer. By Using the –A argument, the SQLCMD utilizes an exclusive connection to SQL Server. If no other connection is possible, the SQLCMD –A command is the last and best hope for diagnosing server problems and preventing data loss. By default, only local DACs are allowed because the DAC components only listen on the loopback connection. However, remote DACs can be enabled using the sp_configure stored procedure by changing the remote admin connections option to true, as the following code illustrates:

sp_configure ‘remote admin connections’, 1

Thanks for the comment, will get back to you soon... Jugal Shah

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