Dynamic Management Views
Another area to retrieve monitoring information is the Master database; this is where SQL Server stores most of its configuration information. It is not a good idea to directly query the master database, because Microsoft could change the structure of the master database from version to version or even in service pack releases. Rather than developers building solutions that rely on the Master database schema and risking any changes in a service pack messing up the solution, Microsoft instead has created a set of dynamic management views and functions.
Dynamic management views and functions return valuable information that can be used to monitor the health of a server instance, diagnose problems, and tune performance. ...
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