Dedicated vs Shared Question

I am trying to understand if my DB is running dedicated or shared. I have read several posts here but some of the information is contradicting each other on my server. This is my analysis so far and it leads me to believe that I am running in dedicated server mode but I would love some help to better understand if I am right. Thanks in advance for your help!
1. We have a dispatcher but you always get on when you create a DB with DBCA and this does not mean the DB runs in shared.
SQL> show parameter dispatcher
NAME TYPE
VALUE
dispatchers string
(PROTOCOL=TCP)
max_dispatchers integer
2. Large_poole_size is 0 and I think if the DB is shared then it will use the large pool, otherwise use the shared pool.
SQL> show parameter large_pool
NAME TYPE
VALUE
large_pool_size big integer
0
3. If shared_servers is greater than 1 then the server is shared but ours is set to 1.
SQL> show parameter SHARED_SERVERS
NAME TYPE
VALUE
max_shared_servers integer
shared_servers integer
1
4. The tnsnames.ora file has SERVER=DEDICATED which means the DB will NOT be shared regardless of above.
5. ps -ef|grep $ORACLE_SID|grep d000 shows a dispatcher but I think this is just the default one.
oracle 4456 1 0 Mar17 ? 00:00:55 ora_d000_ENGTREQ1

995322 wrote:
Alright so my senior said that when our java developers connect through the database using JDBC and don't put SERVER=DEDICATED on the HTML string it ignores tnsnames.ora and automatically creates a shared connection. Your senior is wrong and there's more to it than that. Didn't take me long to put together a proof, even though I've never worked directly with setting up jdbc connections. For this test I created a connection in SQL Developer using jdbc thin. The "connection string" (url) looks like this:
jdbc:oracle:thin:@vblnxsrv01:1521/orclNo specification of shared or dedicated.
listener shows
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfullythe orclXDB is associated with the dispatchers.
Behold. Costello is using the jdbc connection from SQL Developer.
1 select username, program, server
2 from v$session
3* where username in ('ABBOT','COSTELLO')
SQL> /
USERNAME   PROGRAM                                          SERVER
ABBOT      sqlplus.exe                                      DEDICATED
COSTELLO   SQL Developer                                    DEDICATEDBut if I change the connection definition properties to
jdbc:oracle:thin:@vblnxsrv01:1521/orclXDBwe get
1 select username, program, server
2 from v$session
3* where username in ('ABBOT','COSTELLO')
SQL> /
USERNAME   PROGRAM                                          SERVER
ABBOT      sqlplus.exe                                      DEDICATED
COSTELLO   SQL Developer                                    NONE
We had a problem where SERVER=DEDICATED was left off and their queries were mysteriously taking random 4 seconds to complete and when they added SERVER=DEDICATED the wait went away.....this confuses me because it looks like the DB is not setup to use shared at all.

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/message/2114775#2114775 [original link is broken]
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<BLOCKQUOTE>quote:<HR>Originally posted by davidxm:
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baskar.l wrote:
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