Welcome to the Idera SQL Check forum. Please feel free to post your questions, feedback, and technical support issues here.
You can always access the latest version of SQL Check here: http://www.idera.com/productssolutions/freetools/sqlcheck
When the SQL Check application is running, it is connected to a SQL Server instance, and it is displaying at least one trend chart (such as 'Waits') in the 'Dashboard' tab:
In the very top-right of the 'Dashboard' tab, on the right side of the light-blue 'HELP' link, select the light-blue gear icon:
In the 'SQL Check Options' dialog, in the left-side navigation tree, select the 'SQL Check' entry:
For example, enter 'Refresh heartbeat graphics every: 1' and 'Show heartbeat graphics last: 9999' to sample data once per second for all of the (trend and bubble) charts and to display 9999 seconds (which is equivalent to ~2.8 hours) worth of data in all of the trend charts.
Refer also to the screen capture image from the product pages.
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