SQL Server Error Log records information about SQL Server during runtime. It’s created under SQLServerRootFolder\MSSQL\Log folder for each start of SQL Server. Information in the file is varied. Some of them are information only; no action needed to be taken. Some of them are really the information you want to look at. The simplest way accessing it is to use SSMS->Management->SQL Server Logs. Bur when the log is huge, Log File Viewer will retrieve all logs back until hit the end of the log or all your local memory is exhaused. Here is a simple way you can recyle them.