Tailing a large active log?

Hi:
This may be a stupid question, but is it OK to tail a large active log file (one that's currently being written to)? I don't want to disrupt the logging process or crash the server because of the log size (ie: 1 gig). Also, if I'm using the -f option to see the log in real time, like so:

tail -f /path_to_log

How would I exit the process?

Thanks,

 

 

 

 

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