Performance Overview


The Performance Overview provides the user with a summary of performance data for all watched instances within a group or site. Open the Performance Overview by right-clicking any Group or Site node in the Navigator pane, and selecting Open Performance Overview.

SentryOne Navigator select instance and Open Performance Overview from the context menu

Note:  You can also open the Performance Overview by selecting the View Performance Stats for All Servers button on the Start page. SentryOne View Performance Stats For All Servers

Note:  Selecting the All Targets node opens an overview showing all of the instances that are being watched. Selecting a custom made group node only displays the instances within that group.

Select the Show Avg Over drop-down list box to change the interval for the summarized data.

SentryOne Performance Overview Show Avg Over drop-down menu

Note:  Select from the following time intervals:

Last SampleTwo minutes10 minutes
30 minutesTwo hoursFour hours
One dayTwo daysThree days

Select the Show drop-down list box to view either Windows, SQL Servers, or Analysis Services.

SentryOne Performance Overview Show drop-down list

Double-click on any target or instance to open View Selector. Select Performance Analysis, and then select Ok to open Performance Analysis for that target or instance.

SentryOne Performance Overview View Selector

Select a performance metric in Performance Overview to view a historical graph of that metric.

SentryOne Performance Overview select an instance in Grid view to see the corresponding graph

Note:  Historical graphs are not available for all metrics. For a detailed description of the various performance metrics, see the Performance Metrics topic.  

Note:  The default setting for the Performance Analysis Overview skin is black, but can be set to standard in the User Preferences window (Tools > User Preferences > Performance Analysis).

SentryOne User Preferences Performance Analysis Overview Skin setting

Expand targets or instances to see additional information by selecting the Expansion arrow by the desired target or instance.

Additional Toolbar buttons

Performance Overview Toolbar buttonDescriptionButton applied
SentryOne Expand All buttonExpands All of the columns in the Performance Overview.SentryOne Performance Overview Expand All applied
SentryOne Collapse All buttonCollapses All of the expanded columns in the Performance Overview.SentryOne Performance Overview Collapse All applied
SentryOne Expand Warnings buttonExpands columns that contain metrics that fall outside of the Warning and Critical thresholds.SentryOne Performance Overview Expand Warnings applied

Failover Simulation

When the monitored instances include AlwaysOn availability groups, users can simulate what the performance values would be in the event of a failover. To do this, expand the nodes until the Availability Groups level has been reached. Right-clicking on an Availability Group that's currently the primary produces a context menu that gives the user the option to select which secondary replica they would like to simulate a failover to. The user can also simulate failover values from a secondary by right-clicking on the secondary replica and selecting Simulate Failover from the context menu.

SentryOne Performance Overview Simulate Failover to

To stop the failover simulation, select Reset Simulation from the context menu of an Availability Group. The simulation can also be reset from the Tools menu.

SentryOne Performance Overview Reset Failover

Once the user has selected to simulate the failover, simulated values appear as italicized. 

SentryOne Performance Overview Simulated Failover example

Selecting a simulated value causes a historical graph of the actual values to appear along with a Simulated Values chart allowing the user to quickly compare the simulated value to the actual value.

SentryOne Performance Overview Simulated Values graph


In the top right corner of each filter column header is a filter button. Select the filter button SentryOne Performance Analysis Overview Filter button to open the Custom AutoFilter dialog box. SentryOne Performance Overview Filter button

Once selected, choose the operator and value to filter the data. Select Ok to save the custom auto filter.

SentryOne Performance Overview Custom AutoFilter

Once a filter is set, it appears along the bottom panel of the window. Edits to the filter can be made by selecting Edit Filter and changing the criteria. It can also be disabled by clearing the checkbox or closed completely by using the on the left side of the window.

SentryOne Performance Overview close filter

Color Indicators

Instance names appear in different colors depending on the status of the instance.

Gray (Black in Standard view)NormalSentryOne Performance Overview Gray color indicator
OrangeA metric crossed the Warning threshold at or below this level.SentryOne Performance Overview Orange color indicator
RedA metric crossed the Critical threshold at or below this level.SentryOne Performance Overview Red color indicator
Black (Gray in the Standard view)Instance offline.SentryOne Performance Overview Black color indicator

Performance Analysis Overview Thresholds

Target LevelNormalWarningCritical
Network Outbound Queue
>= Three>= Three for 20 second duration
Network Inbound Errors

> Zero
Network Outbound Errors

> Zero
Memory Free (MB)

CPU Context Switches<5000 times # of cores>=5000 times # of cores>=7500 times # of cores
CPU Processing Time Percent
CPU Queue Length

>Two times the number of cores
Target and SQL Server Level

Disk Reads ms/IO<2020-29>=30
Disk Writes ms/IO<2020-34>=35
SQL Server Level

SQL Server Activity Blocks

> Zero
SQL Server Activity Deadlocks

> Zero
Average Wait Time (ms) CPU Percent

SQL Server Memory Grants Pending

> Two
SQL Server Memory PLE

Disk IO Lazy Writes

SSAS Level

SSAS Formula Engine Queued Jobs
> Zero
SSAS Storage Engine Queued Jobs
> Zero
SSAS Memory Cache Evictions
> Zero
SSAS Storage Temp File (KB)

> Zero
SSAS Memory (KB) Shrunk
> Zero