1) Event log ("event_log" table) have it's own retention time and it's completely independent from DCI history.
Retention time is controlled by server parameter "EventLogRetentionTime". Default value is 90 days.
2) Two options: create object tool with type "Download" pointing to server's log (enabled "follow changed", if desired), or enabled filemgr subagent on the agent and use file manager functionality for that.
http://netxms.readthedocs.org/projects/admin/en/latest/object-management.html#download-file
http://netxms.readthedocs.org/projects/admin/en/latest/remote-file-management.html
Retention time is controlled by server parameter "EventLogRetentionTime". Default value is 90 days.
2) Two options: create object tool with type "Download" pointing to server's log (enabled "follow changed", if desired), or enabled filemgr subagent on the agent and use file manager functionality for that.
http://netxms.readthedocs.org/projects/admin/en/latest/object-management.html#download-file
http://netxms.readthedocs.org/projects/admin/en/latest/remote-file-management.html