Your logs should automatically be being cleaned out accordint to drupal settings ( every 7 days or something like it) provided you've got a cron configured appropriately.  Look in your scripts folder in the drupal install for a sample cron script that you should run. If you curl cron.php, most of the drupal maintenance tasks will be taken care of for you.
 
Dave


From: support-bounces@drupal.org [mailto:support-bounces@drupal.org] On Behalf Of bharani kumar
Sent: Friday, January 30, 2009 7:48 AM
To: support@drupal.org
Subject: [support] Few Tips for site maintenance

Hi Everyone,

Can u tell me few tips for site maintenance,

How to increase the performance,

My watch dog table is reached around 10,0000 rows,

what i do, shall i delete, or shall i write some cron script for delete that rows,

Tell me your suggestion for increase the site performance,

thanks

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B.S.Bharanikumar

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