Log files are created for individual collections and for system-level sessions.
When you configure logging options for a collection or for the system, you specify the types of messages that you want to log, such as error messages and warning messages. You also specify how often you want the system to rotate older log files to make room for recent messages. You can choose options to receive email about specific messages (including alerts), or all error messages, whenever they occur.
When you view log files, you select the log file that you want to view. The file name includes information about when the file was created and which component issued the messages. You can also specify viewing filters. For example, you can choose to see only error messages or only messages from a particular system session.