[ 
http://issues.apache.org/jira/browse/DERBY-458?page=comments#action_12319866 ] 

Tomohito Nakayama commented on DERBY-458:
-----------------------------------------

The current architecture is that 
EmbedConnection and NetworkConnection are different existences at all.
EmbedConnection is existence which acts in engine and
NetworkConnection is just an existence of handle to EmbedConnection separeted 
from engine by network.


Protocol of communication between NetworkConnection and EmbedConnection is DRDA 
( Distributed Relational Database Architecture ).

Information source of the specs of DRDA is as next.
http://www.opengroup.org/dbiop
In Volume 1  take a look at  Figure 4-2 Establishing a Connection to a Remote 
Database Manager
This shows the protocol flow for creating a connection. You can find 
definitions of specific DDM objects referenced there,  e.g.  ACCRDB, in the DDM 
manual (Volume 3).
The figures in Chapter 4 of volume 1 are a good place to get a general idea of  
the protocol flow.


Source of this information is the mail at 
http://article.gmane.org/gmane.comp.apache.db.derby.devel/7497

> Make it clear the difference between EmbedConnection and Networked Connection
> -----------------------------------------------------------------------------
>
>          Key: DERBY-458
>          URL: http://issues.apache.org/jira/browse/DERBY-458
>      Project: Derby
>         Type: Task
>   Components: Network Client, Network Server
>     Reporter: Tomohito Nakayama

>
> This is question found in DERBY-397.
> There must be significant difference between EmbedConnection and Networked 
> Connection.
> What is the difference between them ?
> It is a significant characteristic of Derby to have EmbedConnection.
> Then, this difference will have special meaning in development of Derby ...
> I think we should discuss in ML .... 

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