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What is the point of "Initial Catalog" in a SQL Server connection string?

Every SQL Server connection string I ever see looks something like this:

Data Source=MyLocalSqlServerInstance;Initial Catalog=My Nifty Database;
    Integrated Security=SSPI;

Do I need the Initial Catalog setting? (Apparently not, since the app I'm working on appears to work without it.)

Well, then, what's it for?

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Ryan Lundy Avatar asked Dec 22 '09 23:12

Ryan Lundy


People also ask

What is the use of initial catalog in connection string?

Accepted Answer. Initial Catalog is the name of the database to be used by the connection string, which is located on the server that was specified in the Data Source part of the connection string.

What is initial catalog in connection string in web config?

Initial Catalog – The name of the Database. User Id – The User Id of the SQL Server. Password – The Password of the SQL Server. In order to access the SQL Server Connection String for SQL Server Authentication from Web.

What is a SQL Server catalog?

The system catalog consists of tables describing the structure of objects such as databases, base tables, views, and indices. (These tables are called system base tables.) The Database Engine frequently accesses the system catalog for information that is essential for the system to function properly.

What is the difference between initial catalog and database?

The only difference is the name. These can be used interchangeably.


3 Answers

If the user name that is in the connection string has access to more then one database you have to specify the database you want the connection string to connect to. If your user has only one database available then you are correct that it doesn't matter. But it is good practice to put this in your connection string.

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Avitus Avatar answered Oct 14 '22 07:10

Avitus


This is the initial database of the data source when you connect.

Edited for clarity:

If you have multiple databases in your SQL Server instance and you don't want to use the default database, you need some way to specify which one you are going to use.

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Andy West Avatar answered Oct 14 '22 08:10

Andy West


Setting an Initial Catalog allows you to set the database that queries run on that connection will use by default. If you do not set this for a connection to a server in which multiple databases are present, in many cases you will be required to have a USE statement in every query in order to explicitly declare which database you are trying to run the query on. The Initial Catalog setting is a good way of explicitly declaring a default database.

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jliles Avatar answered Oct 14 '22 09:10

jliles