EventLog is a single table which holds reports of events and errors. When you go to the web page Admin | Event Log or Admin | Log Viewer (different DNN versions or skins) ... you see a direct report of the EventLog table.

if you truncate the table, you simply remove all content from that table, and will not affect anything else negatively.

But i would consider the problem a symptom. Review database, whether it's getting backed up; the database transaction log file requires backups in order to get reduced in size; else it will grow and grow and eat up disk space as well.

DNN writes to the EventLog table for a number of reasons. Just because the error you saw referenced an inability to write to this table doesn't necessarily mean that the size of this table was the culprit. Though, it certainly could be.

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pmgerholdt