DB - What database metrics do I monitor?

SQL Server Performance monitoring revolves around many key areas

• CPU
• Memory
• Disk I/O
• Also, the factors such as user connections, database transaction rate, and data and log file settings

These factors give an overview of its impact on the performance of the application. This article is an effort to understand the general characteristics of databases; it gives an overview about the key factors used to classify the databases as critical, medium and low usage databases.