Microsoft SQL Server database ranks third in the relational database, second only to Oracle and MySQL database. when using it, it is inevitable to encounter various problems and warnnings. You may be dba or a developer, I hope this content can help you solve SQL Server error number 18598.

Error number: 18598

Severity level: 16

Event logged: %.*ls could not find the default instance (%.*ls) – error %d. Please specify the name of an existing instance on the invocation of sqlservr.exe.\n\nIf you believe that your installation is corrupt or has been tampered with, uninstall then re-run setup to correct this problem.