When running SQL Server certain times we may have to limit the size and number of SQL server errorlogs

To limit the size of SQL Server errorlogs add a new registry key GetMaxErrorLogSizeKb under
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQL.X\MSSQLServer\ErrorLogSizeInKb
By default, this key is absent. Modify the value to the size of errorlog(In Kb) you want to maintain.

To increase the number of log files, add a new registry key “NumErrorLogs” (REG_DWORD) under below location.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQL.X\MSSQLServer\
By default, this key is absent. Modify the value to the number of logs that you want to maintain.

To learn more about sp_readerrorlog and its parameters read Beyond XP_READERRORLOG (Parameters of XP_READERRORLOG)