|AttachDBFilename<br /><br /> -or-<br /><br /> Extended Properties<br /><br /> -or-<br /><br /> Initial File Name|N/A|The name of the primary database file, including the full path name of an attachable database. AttachDBFilename is only supported for primary data files with an .mdf extension.<br /><br /> If the value of the AttachDBFileName key is specified in the connection string, the database is attached and becomes the default database for the connection.<br /><br /> If this key is not specified and if the database was previously attached, the database will not be reattached. The previously attached database will be used as the default database for the connection.<br /><br /> If this key is specified together with the AttachDBFileName key, the value of this key will be used as the alias. However, if the name is already used in another attached database, the connection will fail.<br /><br /> The path may be absolute or relative by using the DataDirectory substitution string. If DataDirectory is used, the database file must exist within a subdirectory of the directory pointed to by the substitution string. **Note:** Remote server, HTTP, and UNC path names are not supported. <br /><br /> The database name must be specified with the keyword 'database' (or one of its aliases) as in the following:<br /><br /> <code>"AttachDbFileName=|DataDirectory|\data\YourDB.mdf;integrated security=true;database=YourDatabase"</code><br /><br /> An error will be generated if a log file exists in the same directory as the data file and the 'database' keyword is used when attaching the primary data file. In this case, remove the log file. Once the database is attached, a new log file will be automatically generated based on the physical path.|
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