Thanks very much for your reply!
I should check these materials first when meeting issues next time.
On Mon, Feb 29, 2016 at 2:25 PM, Christian Antognini <
I have a generic but IMO important advice for you.
When dealing with questions like the following...
So what is the meaning of "server processes" here? Which definition ismore accurate? How to understand SGA?
... the first thing you should do is to open the Concept Guide at
http://docs.oracle.com/database/121/CNCPT/toc.htm. For example, in this
specific case, "Overview of the System Global Area (SGA)" at
In there you also find the term "server processes"... so, if you don't know
what those things are, you check the Glossary available in the same book.
So, for "server processes", you find a definition at
The Concept Guide is one of the most important books published by Oracle.
Every time you have question related to the architecture of the database
engine, you should refer to it.
Troubleshooting Oracle Performance, Apress 2008/2014