Turn off the system wide Debug logging
As debug logs may be an order of magnitude greater in size than the normal execution logs, they can take up significant space. Although they are not indexed and should not affect performance by themselves, they can definitely push against the database allocation.
Information note
This consideration is especially important on daily harvesting of large databases, file systems and BI servers. Also, the setting is system wide, so once you are through testing or reporting a ticket (which requires debug-level logging) it is important to turn it back off.
You may turn the Debug logging on and off under MANAGE > System.