Database Tutorials MSSQL, Oracle, PostgreSQL, MySQL, MariaDB, DB2, Sybase, Teradata, Big Data, NOSQL, MongoDB, Couchbase, Cassandra, Windows, Linux 
ERROR MESAGGE: Login failed for user ‘(null)’. Reason: Not associated with a trusted SQL Server connection. (Microsoft SQL Server, Error: 18452) EXPLANATION: If you …
Read More »Cannot open user default database
ERROR MESAGGE: “Cannot open user default database. Login failed. Login failed for user . (Microsoft SQL Server, Error: 4064)” EXPLANATION: In SQL Server, a …
Read More »A connection could not be established to . Reason: Login failed for user. Reason: Server is in single user mode. Only one administrator can connect at a time
ERROR MESAGGE: “A connection could not be established to . Reason: Login failed for user <server\login_name>. Reason: Server is in single user mode. Only one administrator …
Read More »Device activation error. The physical file name may be incorrect.
ERROR MESAGGE: “Device activation error. The physical file name <database_file_path>may be incorrect.”</database_file_path> EXPLANATION: You receive this error when you try to create a database in …
Read More »The CREATE DATABASE statement failed. The primary file must be at least x MB to accommodate a copy of the model database
ERROR MESAGGE: “The CREATE DATABASE statement failed. The primary file must be at least x MB to accommodate a copy of the model database.” …
Read More »Drop failed for Login ‘Login_Name’. The server principal owns an endpoint and cannot be dropped. (Microsoft SQL Server, Error: 15141)
ERROR MESAGGE: “Drop failed for Login ‘Login_Name’. The server principal owns an endpoint and cannot be dropped. (Microsoft SQL Server, Error: 15141)” EXPLANATION: You …
Read More »The SQL Server (‘Instance_Name’) service failed to start due to the following error: The service did not start due to a logon failure.
ERROR MESAGGE: On SQL Server Configuration Manager: The request failed or the service did not respond in a timely fashion. Consulf the event log …
Read More »Connections to SQL Server files (*.mdf) require SQL Server to function properly
ERROR MESAGGE: “Connections to SQL Server files (*.mdf) require SQL Server to function properly. Please verify the installation of the component or download from …
Read More »Database ‘xxx’ cannot be opened due to inaccessible files or insufficient memory or disk space
ERROR MESAGGE: “Database ‘xxx’ cannot be opened due to inaccessible files or insufficient memory or disk space. See the SQL Server errorlog for details. …
Read More »An error has occurred while establishing a connection to the server…No connection could be made because the target machine actively refused it
ERROR MESAGGE: “An error has occurred while establishing a connection to the server. When connecting to SQL Server 20xx, this failure may be caused …
Read More »