Disable Error Logging
Login to your administration area and go to – System > Configuration > Developer Under the Log Settings section, be sure that Enabled is set to No Database Maintenance Tips
There are several tables used by Magento for logging. While logging is very important regarding knowing what has and is going on with your store, the logs can become large very quickly, so regularly maintenance can be of great assistance.
Here are the tables for logging:
log_customer
log_visitor
log_visitor_info
log_url
log_url_info
log_quote
report_viewed_product_index
report_compared_product_index
report_event
catalog_compare_item