What is Connect Timeout in sql server connection string

Question

I have the following connection string get from a property of sql server    Data Source  LocalDB  v11 0 AttachDbFilename C  Users myUser Desktop adoBanche Banche bin Debug banche mdf Integrated Security True Connect Timeout 30   I don t understand what mean Timeout 30  Someone could explain what means

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Connect Timeout 30 means  within 30second sql server should establish the connection other wise current connection request will be cancelled It is used to avoid connection attempt to waits indefinitely

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That is the timeout to create the connection  NOT a timeout for commands executed over that connection  See for instance http   www connectionstrings com all-sql-server-connection-string-keywords   note that the property is  quot Connect Timeout quot   or  quot Connection Timeout quot    not just  quot Timeout quot    From the comments  It is not possible to set the command timeout through the connection string  However  the SqlCommand has a CommandTimeout property  derived from DbCommand  where you can set a timeout  in seconds  per command  Do note that when you loop over query results with Read    the timeout is reset on every read  The timeout is for each network request  not for the total connection

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How a connection works in a nutshell  A connection between a program and a database server relies on a handshake   What this means is that when a connection is opened then the thread establishing the connection will send network packets to the database server  This thread will then pause until either network packets about this connection are received from the database server or when the connection timeout expires    The connection timeout  The connection timeout is measured in seconds from the point the connection is opened    When the timeout expires then the thread will continue  but it will do so having reported a connection failure    If there is no value specified for connection timeout in the connection string then the default value is 30  A value greater than zero means how many seconds before it gives up e g  a value of 10 means to wait 10 seconds  A value of 0 means to never give up waiting for the connection   Note  A value of 0 is not advised since it is possible for either the connection request packets or the server response packets to get lost  Will you seriously be prepared to wait even a day for a response that may never come   What should I set my Connection Timeout value to   This setting should depend on the speed of your network and how long you are prepared to allow a thread to wait for a response    As an example  on a task that repeats hourly during the day  I know my network has always responded within one second so I set the connection timeout to a value of 2 just to be safe  I will then try again three times before giving up and either raising a support ticket or escalating a similar existing support ticket   Test your own network speed and consider what to do when a connection fails as a one off  and also when it fails repeatedly and sporadically

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Maximum time between connection request and a timeout error  When the client tries to make a connection  if the timeout wait limit is reached  it will stop trying and raise an error

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Gets the time to wait while trying to establish a connection before terminating the attempt and generating an error   MSDN  SqlConnection ConnectionTimeout Property  2013

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By default connection timeout is 240 but if you are faceing the problem of connection time out then you can increase upto  300   Connection Timeout 300

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Gets the time to wait while trying to establish a connection before terminating the attempt and generating an error   http   msdn microsoft com en-us library system data sqlclient sqlconnection connectiontimeout 28v vs 110 29 aspx

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Connection Timeout 30 means that the database server has 30 seconds to establish a connection    Connection Timeout specifies the time limit  in seconds   within which the connection to the specified server must be made  otherwise an exception is thrown i e  It specifies how long you will allow your program to be held up while it establishes a database connection      DataSource server  InitialCatalog database  UserId username  Password password  Connection Timeout 30   SqlConnection ConnectionTimeout  specifies how many seconds the SQL Server service has to respond to a connection attempt  This is always set as part of the connection string    Notes    The value is expressed in seconds  not milliseconds   The default value is 30 seconds  A value of 0 means to wait indefinitely and never time out    In addition  SqlCommand CommandTimeout specifies the timeout value of a specific query running on SQL Server  however this is set via the SqlConnection object setting  depending on your programming language   and not in the connection string i e  It specifies how long you will allow your program to be held up while the command is run

[sql] What is "Connect Timeout" in sql server connection string?

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