9i: Listener, endpoints and services

Question

Hi,
I want to do B2B on an Oracle 9i DB.
No Tomcat, no Apache, no 9iAS, nothing but 9i EE DB!!
If you have a listener on a port, maybe 9950
and you don't choose the DB-Service stuff
you can put in a service written by yourself.
Can you?
Which interfaces do I have to implement.
oracle.ds.engine.InputAdaptor
Write an Adapter?
I searched:
http://tahiti.oracle.com/pls/db901/db901.drilldown?remark=&word=S
ervice&book=&preference=
And I'm too stupid to fully understand the task?
Please help me out on that!
Thanks,
Volker.

Answer 1

Service is just a group of sessions. I will try to explain as basic as possible.
For example You have 2 Applications, Accounting and Reporting applications, You want to separate them, separate their resources, statistics or connection methods.
For example on single instance, we will create (using dbms_service.create_service) two services ACCOUNT.SERVICE and REPORT.SERVICE, then we can
use them in the resource manager, we can assign jobs to the services, we can check any statistics service based, for example for which event class Accounting application
waits maximum time, i/o or concurrency? We can select from v$service_wait_class where service_name=ACCOUNT.SERVICE. Everything in the 10g can be analyzed service based,
you also for example can trace Reporting application by tracing REPORT.SERVICE service using dbms_monitor.serv_mode_act_trace_enable procedure.
We need all Accounting application sessions to connect to ACCOUNT.SERVICE, then in connection descriptor of this application we use SERVICE_NAME=ACCOUNT.SERVICE, and
we can check then from v$session where service_name='ACCOUNT.SERVICE', there will be sessions that are connected from Accounting application. Reporting application will use SERVICE_NAME=REPORT.SERVICE in connect descriptor, and we will identify them in database by selecting from v$session where service_name='REPORT.SERVICE'.
Default service name is db_name.db_domain there is also system specific services SYS$USERS and SYS$BACKGROUND for system connections and background processes.
When we create service in the database PMON will register them automatically with listeners.