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Drupal Version
If using the "Database logging" module in core, be sure to keep only a small number of entries (1,000 seems reasonable).
Until we have a solution that can feed syslog information from Drupal into regular system logs on OIT Web Hosting, we use the "Database logging" module in core to track errors, logins, and other system messages. This module stores its logs in the watchdog table.
It is important to set this module to only keep a small number of log entries (such as 1,000), so that our database servers don't get overwhelmed. You can change the settings for your Drupal 7 site at: Configuration -> Development -> Logging (admin/config/development/logging).