What is Dynamic performance views in oracle database?

Dynamic performance views are oracle system views owned by SYS user. And the views enables us to access information about the dynamic performance statistics of a database.

These tables are sometimes referred to as the “V$ tables” because the table names are prefixed with the characters V$.

Some of the statistics or information  that can be found in the V$ tables include but not limited to:

• The amount of free space available
• Chained rows information
• Rollback segment contention information
• The amount of memory usage
• The Disk activity