Hi,
We are in the process of implementing Oracle Resource Plans and while reading the documentation I came across the follwing.

What is the Database Resource Manager?
Typically, when database resource allocation decisions are left to the operating system, you may encounter the following problems:

Excessive overhead


Excessive overhead results from operating system context switching between Oracle servers when the number of servers is high.


Inefficient scheduling

The operating system de-schedules Oracle servers while they hold latches, which is inefficient.


Please note the statements above in bold . I am confused as to what they mean.

Can somebody please throw more light on them.

Thanks