Viewing Reports : Viewing DNS Cache Hits Reports
  
Viewing DNS Cache Hits Reports
The DNS Cache Hits report displays the rate of DNS cache hits and misses for the time period specified.
For details about operating report controls, see Overview.
The DNS Cache Hits report contains this table of statistics that summarize DNS activity.
Data Series
Description
Miss Rate
Displays the rate of cache misses.
Hit Rate
Displays the rate of cache hits.
The navigator shadows the hit rate series.
What This Report Tells You?
The DNS Cache Hits report answers these questions:
•  What was the rate of DNS requests that were cached?
•  What was the rate of DNS requests that were not cached?
About Report Graphs
Use the mouse to hover over a specific data point to see the y values and exact time stamp were in relation to peaks.
About Report Data
The Riverbed system reports for periods up to one month. Due to performance and disk space considerations, the display granularity decreases with time passed since the data was sampled.
For detailed information about data grouping, see Data Grouping.
To view DNS cache hits report
1. Choose Reports > Optimization: DNS Cache Hits to display the DNS Cache Hits page.
Figure: DNS Cache Hits Report
2. Use the controls to customize the report as described in this table.
Control
Description
Time Interval
Select a report time interval of 1 hour (1h), 1 day (1d), 1 week (1w), 30 days (30d), yesterday, last week, or last month.
Time intervals that do not apply to a particular report are dimmed.
For a custom time interval, enter the start time and end time using the format YYYY/MM/DD HH:MM:SS.
Because the system aggregates data on the hour, request hourly time intervals. For example, setting a time interval to 08:30:00 to 09:30:00 from 2 days ago does not create a data display, whereas setting a time interval to 08:00:00 to 09:00:00 from 2 days ago will display data.
When you request a custom time interval to view data beyond the aggregated granularity, the data is not visible because the system is no longer storing the data. For example, the following custom time intervals do not return data because the system automatically aggregates data older than 7 days into 2-hour data points:
•  Setting a 1-hour time period that occurred 2 weeks ago.
•  Setting a 75-minute time period that occurred more than 1 week ago.
You can quickly see the newest data and see data points as they are added to the chart dynamically. To display the newest data, click Show newest data.
Group
Select the group from the drop-down list.
Note: For detailed information about exporting statistics, see Exporting Statistics.