After upgrading Spectrum on Windows, SQL errors are seen in Windows application logs similar to the following:
Event 100, MySQL
Native table 'performance_schema' has the wrong structure
Probable corruption in the database schema.
Reinstall the last major install of Spectrum and then any PTF or debug patches installed.
For example, if running Spectrum 10.2.1 with post PTF or debug patches installed, reinstall Spectrum 10.2.1 and then the post PTF or debug patches installed after Spectrum 10.2.1 previously.