The History Browser is intended to provide information pertaining to the state of your SQL Server instance at the time a standard snapshot is taken. You can use this information to diagnose and resolve issues to keep the issue from happening again. The History Browser allows you to select a historical snapshot collected by the standard refresh and view the data that was collected using almost all the SQL Diagnostic Manager real-time views.
By default, Session details and inactive alerts are stored for 31 days while standard metric information is stored for 365 days. You can edit these options on the window.
Historical Snapshot drop-down
SQL Diagnostic Manager has a historical snapshot drop-down in the top-right corner, the drop-down allows you to retrieve faster historical and real time data. The following options are available for the data retrieval:
- Real Time
- Show last 15minutes of data
- Show last 30 minutes of data
- Show last hour of data
- Show last 2 hours of data
- Show last 4 hours of data
- Shot last 6 hours of data
- Show last day of data
- Show last 5 days of data
- Enter a Custom Time Range
Select a specific snapshot in time in the History Browser
To select a specific snapshot:
- Open the History Browser.
- Select the date from the calendar. You can also select the time range to filter the number of snapshots displayed.
- Select the corresponding snapshot from the Historical Snapshots list.
The icons next to each of the snapshots represent the highest level of alert thresholds violated. These icons can help you identify a specific snapshot. In addition, you can hover over snapshots in the list to see the most critical alerts associated with the snapshot.
The alert status listed by snapshots in the History Browser may not reflect the latest status due to delays in writing history to the repository. This status corrects eventually in the History Browser.
Alerts with associated views that support historical snapshots
On the Alerts view, some of the alerts allows you to retrieve the associated view at the time the alert was activated. To access this view, right-click the alerts, and the click Show Historical View in the Details pane.
The following table displays a list of alerts that provide an associated view in SQL Diagnostic Manager.
Average Disk Milliseconds Per Read
Average Disk Milliseconds Per Transfer
Average Disk Milliseconds Per Write
Blocked Sessions (Count)
Blocking Session Wait Time (Seconds)
Client Computers (Count)
Databases Read/Write Errors Occurred
Disk Reads Per Second
Disk Transfers Per Second
Disk Writes Per Second
Host CPU Usage (Percent)
Host Memory Usage (Percent)
Oldest Open Transactions (Minutes)
OS Average Disk Queue Length (Count)
OS Average Disk Queue Length Per Disk (Count)
OS Disk Time (Percent)
OS Disk Time Per Disk (Percent)
OS Memory Usage (Percent)
OS Paging (Per Second)
OS Privileged Time (Percent)
OS Processor Queue Length (Count)
OS Processor Time (Percent)
Page Life Expectancy
Session CPU Time (Seconds)
SQL Server CPU Usage (Percent)
SQL Server Memory Usage (Percent)
SQL Server Response Time (Milliseconds)
Tempdb Contention (ms)
User Connections (Percent)
VM CPU Usage (Percent)
VM Memory Usage (Percent)
Views that support historical snapshots
Users may notify you of SQL Server problems that have happened in the past. Using the History Browser, you can go back to a point in time and view the state of your system and also compare system states at different points in time.
The following views support historical snapshots:
- Overview > Dashboard
- Overview > Details
- Overview > Active Alerts
- Sessions > Summary
- Sessions > Details
- Sessions > Locks
- Sessions > Blocking
- Queries > Signature Mode
- Queries > Statement Mode
- Queries > Query History
- Queries > Query Waits
- Resources > Summary
- Resources > CPU
- Resources > Memory
- Resources > Disk
- Resources > File Activity
- Resources > Server Waits
- Databases > Tempdb Summary
- Databases > Availability Group
- Analyze > History