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Dac means dedicared admin account, which is used to access sql server at .by default 1433 is sql server port , 1434 ia dac account. Starting the server in single user mode will use DAC (Dedicated Administrative Connection) connection. DAC Connection will use If the number of connections are limited for the instance and all are connected and if some one wants to connect and fails to troubleshoot if DBA want to connect he will also be restricted then he can use DAC connection to connect to the instance. When ever the SQL Server standard connection not establish the connection then we go with DAC connection . only sys admin can use this DAC to connect the server and troubleshoot the problems.

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