Causes and solutions of database access failure: Causes: Incorrect login account number, password, server name and database name make it impossible to connect, which is relatively common. Carefully check whether the information filled in is correct, which can generally be solved. Solution: When the database can't connect with the software in use, there is usually a problem with the server name. Changing the server name can usually solve the problem. If the database is installed on this computer, the server name can be replaced with "."or "(local)"; If it is installed on other computers in the local area network, you can use the IP address as the server name.