Using Database Query Statistics 
Database query statistics are useful when monitoring or debugging database performance issues.
Recommendation
To improve system performance, we recommend not leaving the query statistics gathering function enabled all the time. We also recommend deleting the query statistics at regular intervals, for example, twice a year, depending on the traffic in your system.
From the wiki administration console, choose .
In the navigation pane, choose Query Stats.
Choose Enable or Disable.
Choose Update.
If enabled, the query statistics appear in the browser frame.
You can set the refresh rate and update or clear the statistics.